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Niru Nahar

  • Research Assistant Professor, Electrical & Computer Engr.
  • Room #263
    1330 Kinnear Rd
    Columbus, OH 43212
  • 614-292-1588

About

Dr. Niru K. Nahar received B.Sc. (honors) in physics from the Dhaka University, Bangladesh. She received MS degree in physics from Indiana University of Pennsylvania, Indiana, PA. She received her MS and PhD degrees in Electrical and Computer Engineering from The Ohio State University in 2002 and 2008, respectively. She has been working as a Researcher with the ElectroScience Laboratory, The Ohio State University since 2008, where she is currently a Research Scientist. She is also the Operational Manager of the new HELIOS (THz & mm-Wave) Laboratory at OSU which was established with the 3M grant from Ohio 3rd Frontier. She has over three years of research experience in Optometry and Vision Science. She has also worked as a research intern at the Surface Analysis lab in the Chemical & Metallurgical Division of Osram Sylvania Inc., Towanda, PA.

Dr. Nahar is a Senior Member of IEEE and member of Antenna and Propagation Society, IEEE Lasers and Electro-Optics, and The Optical Society (OSA). She served as Secretary/Treasurer, Vice Chairman and Chairman of IEEE Joint AP/MTT Chapter Columbus Section from 2011-2014. She also serves as a reviewer for the journals such as, IEEE Antennas and Wireless Propagation Letters; Optometry Journal of the American Optometric Association; IEEE Transactions on Geoscience and Remote Sensing; Antennas and Propagation Magazine; Journal of Infrared, Millimeter, and Terahertz Waves; IET Microwaves, Antennas & Propagation; Progress In Electromagnetics Research; Optics Communications; Saudi Journal of Ophthalmology; and Journal of Stress and Health.

Research Interests

Her current research interests include THz sensing, imaging, filters and spectroscopy, metamaterials, conformal RF-EO systems, phased antenna array, mm-wave sensing, free-space optics, fiber optics, optical true time-delay engine, wideband beam steering, and objective measures of eyestrain. She has authored one book and has published over 50 journal papers and conference articles.

Honors

  • 20180819-20180826

    1st place in Student Paper Competition: Shubhendu Bhardwaj, Niru K. Nahar and John L. Volakis, “Novel Circularly Polarized Horn Antennas and Phase-less Characterization methods for sub-mm-Wave and Terahertz Communication and Sensing”. Alabama Southern Community College.

  • 20180420

    3rd place in Krauss Memorial ECE student poster competition: U. Chipengo, N. K. Nahar and J. L. Volakis, Novel Concepts for Slow Wave Structures Used in High Power Backward Wave Oscillators.

  • 20171215

    ElectroScience Laboratory Annual Best Journal Article Award Runner-Up: Woon-Gi Yeo, Ogan Gurel, Nandhini Srinivasan, Paul D. King, Niru K. Nahar, Sungchan Park, Norman L. Lehman and Kubilay Sertel, “THz Imaging and Electromagnetic Model of Axon Demyelination in Alzheimer’s Disease”.

  • 20170709-20170714

    3rd place in Student Paper Competition: Nandhini Srinivasan, Cosan Caglayan, Niru K. Nahar, Kubilay Sertel, “High-resolution Polarimetric THz Imaging for Biomedical Applications”.

  • 20170303

    1st place in student engineering competition: U. Chipengo, N. K. Nahar and J. L. Volakis, Novel Concepts for Slow Wave Structures Used in High Power Backward Wave Oscillators.

  • 20161101

    2nd place, IEEE-AP/MTT Columbus Chapter Graduate Student Poster Competition.

  • 20160901

    Student Shubhendu Bhardwaj received Louise B. Vetter Award.

  • 20160801

    Electred Member of USNC-URSI Commission B.

  • 20160601

    3rd Best Student Paper Award, IEEE International Symposium on Antennas and Propagation.

  • 20160601

    OSA Senior Member.

  • 20160501

    Student Shubhendu Bhardwaj received Presidential Fellowship.

  • 20160301

    Finalist in Student Paper Competition, IEEE International Symposium on Antennas and Propagation.

  • 20160301

    Honorable Mention in Student Paper Competition, IEEE International Symposium on Antennas and Propagation.

  • 20151001

    1st place in Student Paper Competition, 37th Antenna Measurement Techniques Association (AMTA) Annual Meeting & Symposium.

  • 20150301

    Lumley Research Award from College of Engineering.

  • 20141001

    2nd place in Student Paper Competition, 36th Antenna Measurement Techniques Association (AMTA) Annual Meeting & Symposium.

  • 20140701

    Honorable Mention in Student Paper Competition, IEEE International Symposium on Antennas and Propagation.

  • 20131001

    Senior Member.

  • 20060801

    Alumni Grants for Graduate Research and Scholarship.

  • 19970501

    Appreciation Awards for Quality Control.

  • 19970201

    Appreciation Awards for Quality Control.

Books

2009

  • 2009. "Free Space Optical True Time Delay for Beam Steering: Design, Simulation and Characterizations." M Verlag.

Chapters

2018

  • 2018. "Dispersion Engineering for Slow Wave Structure Design." In High Power Microwave Sources and Technologies Using Metamaterials, edited by E. Schamiloglu, ; E. Schamiloglu,,

Journal Articles

2017

  • Yeo, W-G.; Gurel, O.; Srinivasan, N.; King, P.D. et al., 2017, "Terahertz Imaging and Electromagnetic Model of Axon Demyelination in Alzheimer's Disease." IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY 7, no. 6, 711-721 - 711-721.
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L., 2017, "A Cost-Effective Phaseless Pattern Measurement Method for a CP Antenna in a Submillimeter-Wave Band." IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 16, 1683-1686 - 1683-1686.
  • Chipengo, U.; Nahar, N.K.; Volakis, J.L., 2017, "A Study of Velocity-Tapered Slow Wave Structures for High-Efficiency Backward Wave Oscillators." IEEE Transactions on Electron Devices
  • Chipengo, U.; Nahar, N.K.; Volakis, J.L., 2017, "Backward-Wave Oscillator Operating in Low Magnetic Fields Using a Hybrid-TE11 Mode." IEEE TRANSACTIONS ON ELECTRON DEVICES 64, no. 9, 3863-3869 - 3863-3869.
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L., 2017, "THz spatial filter employing bimaterial switching for temperature sensing." Microwave and Optical Technology Letters 59, no. 1, 168-171 - 168-171.
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L., 2017, "All electronic propagation loss measurement and link budget analysis for 350 GHz communication link." Microwave and Optical Technology Letters 59, no. 2, 415-423 - 415-423.

2016

  • nahar, N.K.N., 2016, "Reconfigurable THz Filters Using Phase-Change Material and Integrated Heater." IEEE Transactions on THz Science and Technology 6, no. 4, 583-591 - 583-591.
  • Varittha Sanphuang, Nima Ghalichechian, Niru K. Nahar and John L. Volakis,, 2016, "Reconfigurable THz Filters Using Phase-Change Material and Integrated Heater." IEEE Transactions on THz Science and Technology 6, no. 4, 583-591 - 583-591.
  • Zuboraj, M.; Chipengo, U.; Nahar, N.K.; Volakis, J.L., 2016, "Experimental Validation of Slow-Wave Phenomena in Curved Ring-Bar Slow-Wave Structure." IEEE TRANSACTIONS ON PLASMA SCIENCE 44, no. 9, 1794-1799 - 1794-1799.
  • Chipengo, U.; Nahar, N.K.; Volakis, J.L., 2016, "Cold Test Validation of Novel Slow Wave Structure for High-Power Backward-Wave Oscillators." IEEE TRANSACTIONS ON PLASMA SCIENCE 44, no. 6, 911-917 - 911-917.
  • Bhardwaj, S.; Nahar, N.K.; Rajan, S.; Volakis, J.L., 2016, "Numerical Analysis of Terahertz Emissions From an Ungated HEMT Using Full-Wave Hydrodynamic Model." IEEE Transactions on Electron Devices 63, no. 3, 990-996 - 990-996.

2015

  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L., 2015, "Equivalent circuit for VO2 phase change material film in reconfigurable frequency selective surfaces." APPLIED PHYSICS LETTERS 107, no. 25,
  • Sanphuang, V.; Yeo, W-G.; Volakis, J.; Nahar, N.K., 2015, "THz Transparent Metamaterials for Enhanced Spectroscopic and Imaging Measurements." IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY 5, no. 1, 117-123 - 117-123.
  • Yeo, W-G.; Nahar, N.K., 2015, "Characterization of a THz CW spectrometer pumped at 1550 nm." INFRARED PHYSICS & TECHNOLOGY 71, 70-76 - 70-76.
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L., 2015, "Radial line slot array antenna with vertical waveguide feed for F-band communication." IET MICROWAVES ANTENNAS & PROPAGATION 9, no. 3, 193-199 - 193-199.
  • Chipengo, U.; Zuboraj, M.; Nahar, N.K.; Volakis, J.L., 2015, "A Novel Slow-Wave Structure for High-Power K-a-Band Backward Wave Oscillators With Mode Control." IEEE TRANSACTIONS ON PLASMA SCIENCE 43, no. 6, 1879-1886 - 1879-1886.
  • Tenneti, S.N.; Nahar, N.K.; Volakis, J.L., 2015, "Full-wave modeling of THz RTD-gated GaN HEMTs." INFRARED PHYSICS & TECHNOLOGY 72, 221-228 - 221-228.
  • Sanphuang,Varittha; Ghalichechian,Nima; Nahar,Niru,K; Volakis,John,L, 2015, "Bandwidth Reconfigurable THz Filter Employing Phase-Change Material." 2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING 1, 2289-2290 - 2289-2290.
  • 2015, "Novel Phaseless Gain Characterization for Circularly Polarized Antennas at mm-wave and THz Frequencies." IEEE Trans. Antennas Propagat. 63, no. 10,
  • 2015, "A Novel Slow-Wave Structure for High-Power Ka-Band Backward Wave Oscillators With Mode Control." IEEE Trans. on Plasma Science 43, no. 6,
  • nahar, N.K.N., 2015, "Characterization of a THz CW spectrometer pumped at 1550nm." Infrared Physics & Technology 71, 70-76 - 70-76.
  • Tenneti, S., 2015, "Full-Wave Modeling of THz RTD-Gated GaN HEMTs." Infrared Physics & Technology 72, 221-228 - 221-228.
  • Varittha Sanphuang, Nima Ghalichechian, Niru K. Nahar, John L. Volakis, 2015, "Equivalent Circuit for VO2 Phase Change Material (PCM) Film in Reconfigurable FSS." Applied Physics Letters 107, no. 25, 253106 - 253106.
  • Sanphuang,Varittha; Ghalichechian,Nima; Nahar,Niru,K; Volakis,John,L, 2015, "Bandwidth Reconfigurable THz Filter Employing Phase-Change Material." 2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING 1, 2289-2290 - 2289-2290.

2014

  • nahar, N.K.N., 2014, "FREQUENCY SELECTIVE SURFACES FILTERS TO ENHANCE PERFORMANCE OF KA BAND APPLICATIONS." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 56, no. 3, 563-568 - 563-568.
  • Sanphuang,Varittha; Ghalichechian,Nima; Nahar,Niru,K; Volakis,John,L, 2014, "Reconfigurable THz Filters with Integrated Micro-Heater." 2014 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 1, 565-566 - 565-566.
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L., 2014, "Analysis and Design of High Electron Mobility Transistors for THz Signal Generation." 2014 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 77-78 - 77-78.
  • Sanphuang,Varittha; Ghalichechian,Nima; Nahar,Niru,K; Volakis,John,L, 2014, "Phase-Change Material for Reconfigurability in THz Band." IEEE NATIONAL AEROSPACE AND ELECTRONICS CONFERENCE (NAECON 2014) 1, 319-320 - 319-320.
  • Tenneti, S.; Nahar, N.K.; Volakis, J.L., 2014, "Full-Wave Optimization of Nitride-Based Resonant-Tunneling Diodes for Terahertz Amplification." 2014 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 2016-2017 - 2016-2017.
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L., 2014, "Phaseless Method of Gain Characterization for Circularly Polarized Antennas for mmWave and THz band." IEEE NATIONAL AEROSPACE AND ELECTRONICS CONFERENCE (NAECON 2014) 304-305 - 304-305.
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L., 2014, "Numerical Modeling of Plasma Oscillations in 2D Electron Gas for THz HEMT Devices." IEEE NATIONAL AEROSPACE AND ELECTRONICS CONFERENCE (NAECON 2014) 302-303 - 302-303.
  • Abumunshar, A.J.; Yeo, W-G.; Nahar, N.K.; Hyman, D.J. et al., 2014, "Tightly Coupled Ka-Band Phased Array Antenna with Integrated MEMS Phase Shifters." 2014 USNC-URSI RADIO SCIENCE MEETING (JOINT WITH AP-S SYMPOSIUM) 104-104 - 104-104.
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L., 2014, "FREQUENCY SELECTIVE SURFACES FILTERS TO ENHANCE PERFORMANCE OF KA BAND APPLICATIONS." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 56, no. 3, 563-568 - 563-568.

2013

  • 2013, "Far-IR multiband dual-polarization perfect absorber for wide incident angles." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 55, no. 3,
  • Yeo,Woon-Gi; Nahar,Niru,K; Sertel,Kubilay, 2013, "Phased Array Antenna with Integrated MEMS Phase Shifters for Ka-Band SATCOM." 2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 1, 105-106 - 105-106.
  • Yeo, W-G.; Nahar, N.K.; Sertel, K., 2013, "Far-IR multiband dual-polarization perfect absorber for wide incident angles." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 55, no. 3, 632-636 - 632-636.
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L., 2013, "MEMS Tunable THz Filters for Sensing." 2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 1130-1131 - 1130-1131.
  • Tenneti, S.; Nahar, N.K.; Volakis, J.L., 2013, "Full-Wave Electromagnetic Modeling of Terahertz RTD-Gated HEMTs." 2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 1136-1137 - 1136-1137.
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L., 2013, "A Concentric-Arrayed Radial Line Slot Array Antenna for THz Applications Optimized Using PSO Algorithm." 2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 1128-1129 - 1128-1129.

2012

  • Chung, J-Y.; Nahar, N.K.; Zhang, L.; Bayram, Y. et al., 2012, "Broadband radio frequency conductivity measurement technique for engineered composites." IET MICROWAVES ANTENNAS & PROPAGATION 6, no. 4, 371-376 - 371-376.
  • Gowrisankaran, S.; Nahar, N.K.; Hayes, J.R.; Sheedy, J.E., 2012, "Asthenopia and Blink Rate Under Visual and Cognitive Loads." OPTOMETRY AND VISION SCIENCE 89, no. 1, 97-104 - 97-104.
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L., 2012, "Broadband THz Filters for THz Sensing Devices." PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS CONFERENCE (NAECON) 38-39 - 38-39.
  • Tenneti, S.; Nahar, N.K.; Volakis, J.L., 2012, "Increased Output Power 300 GHz Oscillator Based on Linear Superposition." PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS CONFERENCE (NAECON) 31-33 - 31-33.
  • 2012, "Asthenopia and Blink Rate Under Visual and Cognitive Loads." OPTOMETRY AND VISION SCIENCE 89, no. 1,

2011

  • 2011, "Wideband antenna array beam steering with free-space optical true-time delay engine." IET MICROWAVES ANTENNAS & PROPAGATION 5, no. 6,
  • 2011, "OPTICALLY TRANSPARENT RF-EO APERTURE WITH 20:1 BANDWIDTH." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 53, no. 8,
  • 2011, "Interactions of visual and cognitive stress." OPTOMETRY-JOURNAL OF THE AMERICAN OPTOMETRIC ASSOCIATION 82, no. 11,
  • 2011, "Efficient Free-Space Coupling to LMA-PCF by Aberration Correction." IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY 1, no. 10,
  • Nahar, N.K.; Raines, B.; Rojas, R.G.; Strojny, B., 2011, "Wideband antenna array beam steering with free-space optical true-time delay engine." IET MICROWAVES ANTENNAS & PROPAGATION 5, no. 6, 740-746 - 740-746.
  • Nahar, N.K.; Rojas, R.G., 2011, "Efficient Free-Space Coupling to LMA-PCF by Aberration Correction." IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY 1, no. 10, 1553-1557 - 1553-1557.
  • Nahar, N.K.; Gowrisankaran, S.; Hayes, J.R.; Sheedy, J.E., 2011, "Interactions of visual and cognitive stress." OPTOMETRY-JOURNAL OF THE AMERICAN OPTOMETRIC ASSOCIATION 82, no. 11, 689-696 - 689-696.
  • Nahar, N.K.; Chung, J-Y.; Tzanidis, I.; Sertel, K. et al., 2011, "OPTICALLY TRANSPARENT RF-EO APERTURE WITH 20:1 BANDWIDTH." MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 53, no. 8, 1863-1866 - 1863-1866.

2009

  • 2009, "Low-loss polynomial White cell optical true-time delay engine for wideband radio frequency array beam steering." APPLIED OPTICS 48, no. 20,
  • Nahar, N.K.; Rojas, R.G., 2009, "Low-loss polynomial White cell optical true-time delay engine for wideband radio frequency array beam steering." APPLIED OPTICS 48, no. 20, 3921-3929 - 3921-3929.

2008

  • Nahar, N.K.; Rojas, R.G., 2008, "Coupling Loss From Free Space to Large Mode Area Photonic Crystal Fibers." JOURNAL OF LIGHTWAVE TECHNOLOGY 26, no. 21-24, 3669-3676 - 3669-3676.
  • 2008, "Coupling Loss From Free Space to Large Mode Area Photonic Crystal Fibers." JOURNAL OF LIGHTWAVE TECHNOLOGY 26, no. 21-24,

2007

  • 2007, "Objective measurements of lower-level visual stress." OPTOMETRY AND VISION SCIENCE 84, no. 7,
  • Nahar, N.K.; Sheedy, J.E.; Hayes, J.; Tai, Y-C., 2007, "Objective measurements of lower-level visual stress." OPTOMETRY AND VISION SCIENCE 84, no. 7, 620-629 - 620-629.

2003

  • Higgins, R.; Nahar, N.K.; Anderson, B.L., 2003, "Design and demonstration of a switching engine for a binary true-time-delay device that uses a White cell." APPLIED OPTICS 42, no. 23, 4747-4757 - 4747-4757.
  • 2003, "Design and demonstration of a switching engine for a Binary True Time Delay Device using a White cell." Journal of Applied Optics 42, no. 23,

Unknown

  • Sahin, S.; Nahar, N.K.; Sertel, K., "Permittivity and Loss Characterization of SUEX for mmW and THz Applications." IEEE Transactions on Terahertz Science and Technology
  • Srinivasan, N.; Nahar, N.K.; Sertel, K., "THz Polarimetric Imaging System with high resolution capabilities for Biomedical Applications." Optics Express
  • Sahin, N.; Nahar, N.K.; Sertel, K., "Dielectric Properties of Low-loss Polymers for mmW and THz Applications." IEEE Transactions on Terahertz Science and Technology
  • "THz Spectroscopic Response and Imaging for Human Brain Tissue with Alzheimer's disease." IEEE Transactions on Terahertz Science and Technology
  • "THz Pulsed Imaging for Cancer Assessment on Human Lung and Small Intestine Tissues." Physics in Medicine and Biology
  • Nahar, N.K., "Tightly Coupled Ka-Band Dipole Array Antenna with Integrated MEMS Phase Shifters." IEEE Transactions on Antennas and Propagation
  • Shubhendu Bhardwaj, Niru K. Nahar, Siddharth Rajan, John L. Volakis, "Numerical Analysis of Terahertz Emission from an Asymmetrically Biased un-gated HEMT." IEEE Transactions on THz Science and Technology

Presentations

  • "New frontiers for commercial applications of terahertz."
  • "Concentric Arrayed Radial Line slot Array Antenna for W-band, Optimized Using Particle Swarm Optimization." 2013, Presented at ElectroScience Lab-Consortium on Electromagnetics and Radio Frequency (ESL-CERF), Annual Meeting July, 2013,
  • "Phase-Change Materials for Reconfigurable Terahertz Microsystems." 2014, Presented at 2014 OSU Materials Week,
  • "Photonics & THz Research Activities at ElectroScience Laboratory." 2011, Presented at ElectroScience Lab-Consortium on Electromagnetics and Radio Frequency (ESL-CERF), Annual Meeting, 2011,
  • "Relationship between vision stress and generalized body stress." 2009, Presented at Computer Display and Vision Conference, Forest Grove, OR,
  • "Beam Steering of Phased Array Antenna with Quadratic White Cell Optical True Time Delay Engine." 2006, Presented at Electromagnetic (EM) Range Consortium Annual Meeting, OSU, Columbus, OH,
  • "RF Array Beam Steering with Free-Space Optical True-Time Delay Engine." 2010, Presented at Electromagnetic (EM) Range Consortium Annual Meeting, Columbus, OH, August, 2010,
  • "Eliminating Aberration in White Cell." 2001, Presented at Great Lakes Optics Symposium,
  • "Micro-Structured Fibers as Delay Elements for Binary Cell." 2004, Presented at DARPA/Northrop Grumman Electronic Systems Project Review,
  • "Microsoft Corporation, Advanced Reading Technologies Group, Project Review." 2006, Presented at Microsoft Corporation, Advanced Reading Technologies Group,
  • "State of Research at ElectroScience Laboratory." 2012, Presented at Battelle Memorial Institute,
  • "Non-Paraxial Lens Design Systems for White Cell True Time Delay Engine." 2002, Presented at DARPA/Northrop Grumman Electronic Systems Project Review,
  • "RF and Optics Research at ElectroScience Laboratory." 2009, Presented at University of Dayton,
  • "Multispectral Sensing & Imaging: Integrated RF, THz and Optical Apertures." 2011, Presented at ElectroScience Laboratory,
  • "Conformal RF-EO Systems." 2014, Presented at AFRL, Project Kick-off meeting,
  • "A Design Analysis of IR Transparent Ka Band Pass Filters Using FSS." 2011, Presented at ElectroScience Lab-Consortium on Electromagnetics and Radio Frequency (ESL-CERF), Annual Meeting,
  • "Cost-Effective, Simple and Accurate CP Gain Measurement Method for sub-mm-wave and Terahertz Frequencies." 2016, Presented at CERF-ESL,
  • "A Novel Slow Wave Structure for mm-Wave Traveling Wave Tubes." 2016, Presented at CERF-ESL,
  • "Novel Concepts for Slow Wave Structures used in High Power Backward Wave Oscillators." 2016, Presented at CERF-ESL,
  • "Broadband FarIR Polymer-supported Filter." 2016, Presented at CERF-ESL,
  • "THz Biosensor employing Phase-Change Materials." 2016, Presented at CERF-ESL,
  • "Novel Phaseless Method of Gain Characterization for Circularly Polarized Antennas for mmWave and THz band." 2014, Presented at ElectroScience Lab-Consortium on Electromagnetics and Radio Frequency (ESL-CERF), Annual Meeting July, 2014,
  • "New Frontiers for Commercial Application of Terahertz." 2011, Presented at ElectroScience Lab-Consortium on Electromagnetics and Radio Frequency (ESL-CERF), Annual Meeting,
  • "Ultra Wideband Transparent RF Aperture for Electro Optical Integration." 2010, Presented at Electromagnetic (EM) Range Consortium Annual Meeting, Columbus, OH, 2010,
  • "Novel Phaseless Gain Characterization for Circularly Polarized Antennas at mm-Wave and THz Frequencies."
  • "Ultra Wideband Transparent RF Aperture for Electro-Optical Integration." Presented at 2010 IEEE International Symposium Antennas and Propagation/CNC-USNC/URSI Radio Science Meeting,

Papers in Proceedings

2018

  • Kula, J.; Nahar, N.K.; Volakis, J.L. "Reconfigurable Band Rejection and Band-Pass Frequency Selective Structures." in IEEE APS/URSI 2018. (7 2018).
  • Sahin, S.; Nahar, N.K.; Sertel, K. "SUEX as an Anti-Reflection Coating for Silicon Lenses for mmW and THz Applications." in IEEE APS/URSI 2018. (7 2018).
  • Newton, L.; Sanphuang, V.; Nahar, N.K. "Reconfigurable Multiband FarIR Notch Filter Employing Phase Change Material." in IEEE APS/URSI 2018. (7 2018).
  • Nahar, N.K.; Sahin, S. "Performance Characterization of Monolithically Integrated mmW Phased Arrays." in IEEE APS/URSI 2018. (7 2018).
  • Nahar, N.K.; Sahin, S. "Millimeter-wave and Terahertz Properties of SUEX, a Thick, Dry Resist Alternative to Epoxy-based SU-8." in IEEE APS/URSI. (7 2018).
  • Saqueb, S.A.N.; Garry, J.L.; Smith, G.E.; Nahar, N.K. et al. "THz Imaging Using Rail-based Synthetic Aperture Radar for the Detection of Concealed Objects." in IEEE APS/URSI 2018. (7 2018).
  • Srinivasan, N.; Caglayan, C.; Nahar, N.K.; Sertel, K. "THz Polarimetric Imaging for Biomedical Applications." in IEEE APS/URSI 2018. (7 2018).
  • Saqueb, S.A.N.; Arage, A.H.; Cabigao, J.; Velasquez, C. et al. "Pyramidal Corrugations as Wideband, Wide-angle Radomes for Millimeter-wave Automotive Radars." in IEEE APS/URSI 2018. (7 2018).

2017

  • Srinivasan, N.; Caglayan, C.; Nahar, N.; Sertel, K. et al. "High-resolution Polarimetric THz Imaging for Biomedical Applications." (1 2017).
  • Abumunshar, A.J.; Nahar, N.K.; Hyman, D.; Sertel, K. "18-40GHz Low-profile Phased Array with Integrated MEMS Phase Shifters." in 11th European Conference on Antennas and Propagation (EUCAP). (1 2017).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Novel Circularly Polarized Horn Antennas and Phase-less Characterization methods for sub-mm-Wave and Terahertz Communication and Sensing." in 32nd International Union of Radio Science General Assembly & Scientific Symposium. (8 2017).
  • "EXPERIMENTAL DEMONSTRATION OF HIGHER ORDER DISPERSION IN INHOMOGENEOUS SLOW WAVE STRUCTURES FOR BACKWARD WAVE OSCILLATORS." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2017).
  • nahar, N.K. "MONOLITHIC REALIZATION AND CHARACTERIZATION OF ON-CHIP UWB PHASED ARRAYS FOR MMW AND THZ CONNECTIVITY." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2017).
  • Chipengo, U.; Nahar, N.K.; Volakis, J.L. "Significant Efficiency Enhancements in High Power Backward Wave Oscillators using Inhomogeneous Slow Wave Structures." in International Symposium of IEEE-Antennas-and-Propagation-Society / USNC/URSI National Radio Science Meeting. (1 2017).
  • Chepengo, U.; nahar, N.K.; Volakis, J.L. "Novel Concepts for Slow Wave Structures used in High Power Backward Wave Oscillators." in 19th Annual Directed Energy Symposium. (2 2017).

2016

  • Varittha Sanphuang; Niru K. Nahar; John L. Volakis "THz Biosensor employing Phase-Change Materials." in IEEE NATIONAL AEROSPACE AND ELECTRONICS CONFERENCE (NAECON 2016). (7 2016).
  • Sahin, S.; Nahar, N.K.; Sertel, K. "On-chip UWB Phased Arrays for mmW Connectivity." in IEEE-Antennas-and-Propagation-Society International Symposium. (1 2016).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Phase-less Measurement Methods of CP Antennas in sub-mm-wave and THz bands." in 10th European Conference on Antennas and Propagation (EuCAP). (1 2016).
  • Bhardwaj, S.; Nahar, N.; Volakis, J.L. "Accurate Low Cost Phaseless Measurement Method of CP Antennas at Millimeter Wave and Terahertz Bands." in IEEE-Antennas-and-Propagation-Society International Symposium. (1 2016).
  • Chipengo, U.; Nahar, N.K.; Volakis, J.L. "Cold Test of Homogeneous and Inhomogeneous Slow Wave Structures for High Power Backward Wave Oscillators." in IEEE-Antennas-and-Propagation-Society International Symposium. (1 2016).
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "THz Spatial Filter Integrating Bimaterial Switching for Sensors." in IEEE-Antennas-and-Propagation-Society International Symposium. (1 2016).
  • Abumunshar, A.J.; Nahar, N.K.; Sertel, K.; Hyman, D.J. "K-to-Ka Band Low-profile Phased Array with Integrated MEMS Phase Shifters." in IEEE-Antennas-and-Propagation-Society International Symposium. (1 2016).
  • Bhardwaj, S.; Nahar, N.; Volakis, J.L. "A Phaseless Gain and Pattern Characterization of CP Antennas in Sub-mm-wave and Terahertz Bands." in IEEE Conference on Antenna Measurements and Applications (CAMA). (1 2016).
  • "Fabrication and Cold Testing of S Band Inhomogeneous Slow Wave Structure for Highly Efficient Backward Wave Oscillator." in 18th Annual Directed Energy Symposium. (3 2016).
  • "THz Spatial Filter with Bimaterial Switching." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2016).
  • "A Novel Slow Wave Structure for V-band Traveling Wave Tube." in IEEE International Symposium on Antennas and Propagation/URSI. (6 2016).
  • "Accurate Low Cost Phaseless Measurement Method of CP Antennas at Millimeter Wave & Terahertz Bands." in IEEE International Symposium on Antennas and Propagation/URSI. (6 2016).
  • "Cold Test of Homogeneous and Inhomogeneous Slow Wave Structures for High Power Backward Wave Oscillators." in IEEE International Symposium on Antennas and Propagation/URSI. (6 2016).
  • "Reconfigurable THz Array Employing Vanadium Dioxide." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2016).
  • "Monolithic UWB Phased Arrays for mmW and THz Applications." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2016).
  • "THz Spatial Filter Integrating Bimaterial Switching for Sensors." in IEEE International Symposium on Antennas and Propagation/URSI. (6 2016).
  • "Thermally-Controlled THz Biosensor employing Phase-Change Materials." in IEEE International Symposium on Antennas and Propagation/URSI. (6 2016).
  • "Protein Electrodynamics & Terahertz Medicine: An Update." in 7th International THz-Bio Workshop 2016. (6 2016).
  • "18-40GHz Phased Array Antenna using Printed Circuit Board Fabrication and Surface-mount MEMS Phase Shifters." in IEEE Radio Science Meeting (USNC-URSI NRSM). (1 2016).
  • "K-to-Ka Band Low-profile Phased Array with Integrated MEMS Phase Shifters." in IEEE International Symposium on Antennas and Propagation/URSI. (6 2016).

2015

  • "Bandwidth Reconfigurable THz Filter Employing Phase-Change Material." in IEEE International Symposium on Antennas and Propagation / USNC/URSI National North American Radio Science Meeting. (1 2015).
  • "THz Spectroscopic Response of Brain Tissue Exhibiting Alzheimer’s Disease." in IEEE International Symposium on Antennas and Propagation. (7 2015).
  • "Propagation Loss Measurement in 300-350 GHz Band Communication Link." in 37th Antenna Measurement Techniques Association (AMTA) Annual Meeting & Symposium. (10 2015).
  • Sahin, S.; Ghalichechian, N.; Nahar, N.K.; Sertel, K. "Lithographically-fabricated Ultrawideband Phased-Arrays for Agile mmW Connectivity." in USNC-URSI Radio Science Meeting (Joint with AP-S Symposium) Proceedings. (1 2015).
  • "Lithographically-fabricated Ultrawideband Phased-Arrays for Agile mmW Connectivity." in IEEE International Symposium on Antennas and Propagation. (7 2015).
  • "Bandwidth Reconfigurable THz Filter Employing Phase-Change Material." in IEEE International Symposium on Antennas and Propagation. (7 2015).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L. "Bandwidth Reconfigurable THz Filter Employing Phase-Change Material." in IEEE International Symposium on Antennas and Propagation / USNC/URSI National North American Radio Science Meeting. (1 2015).
  • "15-40GHz Tightly-Coupled Dipole Array with Integrated MEMS Phase Shifter." in IEEE International Symposium on Antennas and Propagation. (7 2015).

2014

  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "A method of phase-less measurements for the circularly polarized gain in the sub-millimeter band." (1 2014).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L. "Phase Change Materials for Reconfigurable Systems." in Joint USNC-URSI Radio Science Meeting / AP-S Symposium. (1 2014).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L. "Reconfigurable THz Filters with Integrated Micro-Heater." in IEEE Antennas-and-Propagation-Society International Symposium (APSURSI). (1 2014).
  • Yeo, W-G.; Gurel, O.; Nahar, N.K.; Hitchcock, C.L. et al. "THz Imaging of Alzheimer's Disease: Spectroscopic Differentiation between Normal and Diseased Tissues." in 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). (1 2014).
  • Sanphuang, V.; Ghalichechian, N.; Nahar, N.K.; Volakis, J.L. "Phase-Change Material for Reconfigurability in THz Band." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2014).
  • Yeo, W-G.; Nahar, N.K.; Hitchcock, C.L.; Park, S. et al. "THz Spectroscopy and Imaging of Major Human Organ Tissues for Cancer Margin Assessment." in Joint USNC-URSI Radio Science Meeting / AP-S Symposium. (1 2014).
  • Bhardwaj, S.; Nahar, N.K.; Volakis, J.L. "Fixed Frequency Slotted Waveguide Beam Reconfigurable Antenna for mmWave Application." in Joint USNC-URSI Radio Science Meeting / AP-S Symposium. (1 2014).
  • Zuboraj, M.; Nahar, N.K.; Volakis, J.L. "A S-BAND HIGH POWER TRAVELING WAVE TUBE FOR RADAR APPLICATION." in Joint USNC-URSI Radio Science Meeting / AP-S Symposium. (1 2014).
  • "A Method of Phase-less Measurements for the Circularly Polarized Gain in the Sub-Millimeter Band." in Radio Science Meeting (USNC-URSI NRSM), 2014. (1 2014).
  • "Fixed Frequency Slotted Waveguide Beam Reconfigurable Antenna for mmWave Application." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • Tenneti, S.N.; nahar, N.K.; Volakis, J.L. "Full-Wave Optimization of Nitride-Based Resonant-Tunneling Diodes for Terahertz Amplification." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • "Fixed Frequency Slotted Waveguide Beam Reconfigurable Antenna for mmWave Application." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • "Phase Change Materials for Reconfigurability in THz Systems." in IEEE NAECON. (6 2014).
  • "Phase Change Materials for Reconfigurability in THz Systems." in IEEE NAECON. (6 2014).
  • "Fixed Frequency Slotted Waveguide Beam Reconfigurable Antenna for mmWave Application." in IEEE NAECON. (6 2014).
  • "Phase Change Materials for Reconfigurable Systems." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • "Reconfigurable THz Filters with Integrated Micro-Heater." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • "Novel Phaseless Method of Gain Characterization for Circularly Polarized Antennas for mmWave and THz band." in 36th Antenna Measurement Techniques Association (AMTA) Annual Meeting & Symposium. (10 2014).
  • Tenneti, S.; Nahar, N.K.; Volakis, J.L. "Modeling of RTD-gated GaN HEMTs at Terahertz frequencies using a full-wave simulation toolset coupled with particle-based equations." (1 2014).
  • "THz Imaging of Alzheimer’s Disease: Spectroscopic Differentiation Between Normal and Diseased Tissues." in The 39th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). (9 2014).
  • "Tightly Coupled Ka-Band Phased Array Antenna with Integrated MEMS Phase Shifters." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • "THz Spectroscopy and Imaging of Major Human Organ Tissues for Cancer Margin Assessment." in IEEE International Symposium on Antennas and Propagation. (7 2014).
  • "Phaseless Method of Gain Characterization for Circularly Polarized Antennas for mmWave and THz band." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2014).
  • "Terahertz-frequency Biomedical Imaging for Wound Management." in 6th Annaul Translation to Clinical (T2C) Regenerative Medicine Wound Care Conference. (3 2014).
  • "Full-Wave Optimization of Nitride-Based Resonant-Tunneling Diodes for Terahertz Amplification." in IEEE Antennas-and-Propagation-Society International Symposium (APSURSI). (1 2014).
  • "High power microwave slow wave structure for relativistic beams." in Radio Science Meeting (USNC-URSI NRSM), 2014 United States National Committee of URSI National. (1 2014).
  • "Analysis and Design of High Electron Mobility Transistors for THz Signal Generation." in IEEE Antennas-and-Propagation-Society International Symposium (APSURSI). (1 2014).
  • "Modeling of RTD-Gated GaN HEMTs at Terahertz Frequencies Using a Full-Wave Simulation Toolset Coupled with Particle-Based Equations." in Radio Science Meeting (USNC-URSI NRSM). (1 2014).
  • "Numerical Modeling of Plasma Oscillations in 2D Electron Gas for THz HEMT Devices." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2014).

2013

  • "Link Budget Analysis for 350 GHz Communication Link." in US-National-Committee-of-URSI National Radio Science Meeting. (1 2013).
  • "MEMS Tunable THz Filters for Sensing." in International Symposium of the IEEE-Antennas-and-Propagation-Society. (1 2013).
  • "Ka-Band Phased Array Antenna with Integrated MEMS Phase Shifters." in US-National-Committee-of-URSI National Radio Science Meeting. (1 2013).
  • Yeo, W-G.; Nahar, N.K.; Hitchcock, C.L.; Park, S. et al. "Real-time THz Imaging of Human Tissue Characteristics and Cancer Margins." in 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). (1 2013).
  • Yeo, W-G.; Nahar, N.K.; Sertel, K. "Phased Array Antenna with Integrated MEMS Phase Shifters for Ka-Band SATCOM." in International Symposium of the IEEE-Antennas-and-Propagation-Society. (1 2013).
  • "Full-Wave Electromagnetic Modeling of Terahertz RTD-Gated HEMTs." in International Symposium of the IEEE-Antennas-and-Propagation-Society. (1 2013).
  • "Full-Wave Electromagnetic Modeling of Terahertz RTD-Gated HEMTs." in IEEE International Symposium on Antennas and Propagation. (7 2013).
  • Yeo, W-G.; Nahar, N.K.; Sertel, K. "Ka-Band Phased Array Antenna with Integrated MEMS Phase Shifters." in US-National-Committee-of-URSI National Radio Science Meeting. (1 2013).
  • "Real-time THz Imaging of Human Tissue Characteristics and Cancer Margins." in The 38th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). (9 2013).
  • "A Concentric-Arrayed Radial Line Slot Array Antenna for THz Applications Optimized Using PSO Algorithm." in International Symposium of the IEEE-Antennas-and-Propagation-Society. (1 2013).
  • "Real-time Focal Plane Array THz Camera for Bio-Medical Imaging." in 4th International THz-Bio Workshop. (2 2013).

2012

  • Yeo, W-G.; Nahar, N.K.; Sertel, K. "Dual-Band, Wide-Incident-Angle Absorber for Far-IR and THz Frequencies." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2012).
  • "Validation of CW THz Spectral Measurements." in IEEE International Symposium on Antennas and Propagation. (1 2012).
  • "Novel FSS filters in Ka band." in IEEE International Symposium on Antennas and Propagation. (1 2012).
  • "Increased Output Power 300 GHz Oscillator Based on Linear Superposition." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2012).
  • "Broadband THz Filters for THz Sensing Devices." in IEEE National Aerospace and Electronics Conference (NAECON). (1 2012).
  • Yeo, W-G.; Nahar, N.K.; Volakis, J.L. "Validation of CW THz Spectral Measurements." in IEEE International Symposium on Antennas and Propagation. (1 2012).
  • "THz Periodic Surfaces to Enhance Spectroscopic Measurements." in International Conference on Electromagnetics in Advanced Applications (ICEAA) / IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (IEEE APWC) / URSI Electromagnetic Environment and Interference Symposium (EEIS). (1 2012).
  • "Terahertz Characterization of Biological Tissues." in USNC- URSI. (1 2012).
  • Yeo, W-G.; Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "THz Periodic Surfaces to Enhance Spectroscopic Measurements." in International Conference on Electromagnetics in Advanced Applications (ICEAA) / IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (IEEE APWC) / URSI Electromagnetic Environment and Interference Symposium (EEIS). (1 2012).
  • "THz Periodic Surfaces to Enhance Spectroscopic Measurements." in Electromagnetics in Advanced Applications (ICEAA), 2012 International Conference on. (9 2012).
  • Sanphuang, V.; Nahar, N.K.; Volakis, J.L. "Novel FSS filters in Ka band." in IEEE International Symposium on Antennas and Propagation. (1 2012).
  • "Coating Designs for Tri-Mode Seeker Domes and Multimode Apertures." in 14th DoD Electromagnetic Windows Symposium, San Antonio, TX. (5 2012).

2011

  • "A Far Infrared Narrowband Detector using Frequency Selective Surfaces." in IEEE, APS/URSI Conference. (7 2011).
  • "New Frontiers for Commercial Applications of Terahertz." in IEEE National Aerospace & Electronics Conference. (6 2011).

2010

  • "Ultra Wideband Transparent RF Aperture for Electro-Optical Integration." in 2010 IEEE International Symposium Antennas and Propagation/CNC-USNC/URSI Radio Science Meeting. (1 2010).

2009

  • "Blinking and squinting when reading: trade-off between cognitive and visual stress." in Computer Display and Vision Conference. (6 2009).
  • "A Practical Approach to Beam Steering with White Cell True-Time Delay Engine." in IEEE, APS/URSI Conference. (6 2009).

2007

  • "Eyelid Squint Response to Visual and Cognitive Stress." in Academy 2007. (10 2007).
  • "Beam Steering of Four Element RF Phased Array Antenna with White Cell Optical True Time Delay Engine." in Electromagnetic (EM) Range Consortium Annual Meeting. (8 2007).
  • "Visual and cognitive stress determines severity of near work induced asthenopia." in Academy 2007. (10 2007).

2006

  • "Electromyography as an Objective measure of Visual Stress." in Academy 2006. (12 2006).

2005

  • nahar, N.K.; Rojas, R.G. "Free space coupling properties of large mode area Photonic Crystal Fibers." in IEEE, APS/URSI Conference. (7 2005).

2003

  • Anderson, B.L.; Collins, S.A.; Mital, R.; Nahar, N.K. et al. "The Octic White Cell True Time Delay Device." in Government Microcircuit applications and critical technology conference. (4 2003).