News – Page 2 – mmWave Antennas & Arrays Lab

Thermo-optic VO2-based silicon waveguide mid-infrared router is published in Optics Express

Our recent publication in Optics Express introduces novel research on a thermo-optic VO₂-based silicon waveguide mid-infrared router featuring asymmetric activation thresholds and large bi-stability. This study examines the routers’ performance, achieving power limiting levels of 56.5 dB in the forward operating mode and 64.5 dB in the reverse operating mode. Notably, the total transmission in the inactive mode reaches 75%. Furthermore, the study discusses the bi-stability and latching behavior exhibited by the router.

Citation: M. Lust*, I. Vitebskiy, I. Anisimov, and N. Ghalichechian, “Thermo-optic VO₂-based silicon waveguide mid-infrared router with asymmetric activation thresholds and large bi-stability,” Optics Express, vol. 31, no. 14, pp. 23260-23273, 2023/07/03 2023, doi: 10.1364/OE.493895.

Reliability of VO2-Based mmWave Switches Article is Published in IEEE TDMR

Our new work on the reliability of VO₂-based mmWave switches is recently published in the IEEE Transactions on Device and Materials Reliability. This study investigates the performance and reliability of vanadium dioxide (VO₂) thin film shunt switches integrated with coplanar waveguide (CPW) in the mmWave frequency range of 35-45 GHz. Remarkably, even after subjecting the switches to 100 million cycles of thermal cycling, statistical analysis showed no degradation in the electrical properties of the VO2 switches.

Citation: S. Chen, M. Lust, A. Roo and N. Ghalichechian, “Reliability of VO₂-Based mmWave Switches Under 100 Million Thermal Cycles,” in IEEE Transactions on Device and Materials Reliability, vol. 23, no. 2, pp. 241-248, June 2023, doi: 10.1109/TDMR.2023.3249771.

Walter Disharoon Receives GTRI Fellowship

GTRI’s Graduate Student Research Fellowship Program provides funding for seven new projects, including research on reconfigurable metasurfaces for high-power microwave systems. Led by graduate researcher Walter Disharoon, accompanied by ECE Professor Nima Ghalichechian and Dr. Joshua Kovitz, chief scientist of the electromagnetics division at GTRI, the project aims to develop versatile metasurfaces using vanadium dioxide (VO₂) to manipulate electromagnetic waves. The team will focus on designing, fabricating, and characterizing the metasurfaces to enhance their functionality and defense capabilities. Congratulations Walter!

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Distinguished Lecture Series: Prof. Nader Behdad – University of Wisconsin-Madison

High power beamsteerable reflectarray paper is published in IEEE TAP

Our new work on high power beamsteerable reflectarray is recently published in IEEE Transactions on Antenna and Propagation. Full citation of this work is as following: K. Q. Henderson, W. Disharoon and N. Ghalichechian, “Towards High Power Beam Steerable Reflectarrays Using Tunable Height Dielectric,” in IEEE Transactions on Antennas and Propagation, doi: 10.1109/TAP.2023.3238671.

Congratulations!

Mark Lust Graduated with Ph.D.

Mark Lust graduated with Ph.D. in Electrical and Computer Engineering from the Ohio State University in December 2022. The Ph.D. dissertation is titled ”VO2 Material Study and Implementation in Reconfigurable mmWave and Thermo-Optic Devices”. We wish Mark the best in the step of his life!

Jordan Ramsey Graduated with Ph.D.

Jordan Ramsey graduated with Ph.D. in Electrical and Computer Engineering from the Ohio State University in December 2022. The Ph.D. dissertation is titled ”Vanadium Dioxide Reflectarray Antennas”. We wish Jordan the best!

Professor Ghalichechian presented at the Radio Club of America!

Professor Ghalichechian presented at the Radio Club of America Technical Symposium, held at Hyatt Regency Hotel in downtown Atlanta, November 19, 2022. His talk was titled: “Antennas and Arrays for Future 5G Systems”

Abstract: Today’s wireless communications systems operate mostly in the microwave bands, which have become a crowded and limited resource. Yet significantly larger bandwidth is available in the mmWave band of 30 to 300 GHz, offering the potential of huge increases in data rates for next generation devices. This talk will review the state-of-the-art in antenna and array research for future mmWave systems. Furthermore, recent research and progress made at Prof. Ghalichechian’s mmWave Antennas and Arrays Laboratory at Georgia Tech is presented.

Antenna-coupled VO2 sensor paper published in APL

Our new work on antenna-coupled VO2 sensors for mmWave imaging is recently published in Applied Physics Letters. Full citation of this work is as following: S. Chen, M. Lust, and N. Ghalichechian, “Antenna-Coupled Microbolometer Based on VO₂’s Non-linear Properties Across the Metal-Insulator Transition Region”, Applied Physics Letters, vol. 121, no. 20, pp. 201901, 2022, doi: 10.1063/5.0123779.