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A reflective millimeter-wave photonic limiter.

Rodion Kononchuk^1,2, Suwun Suwunnarat², Martin S Hilario³

¹Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA.

Science Advances

|January 14, 2022

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This study presents a novel photonic limiter for millimeter-wave (mm-wave) systems. The device uses a vanadium dioxide (VO2) nanolayer to protect sensitive components from high-power signals by becoming reflective above a threshold intensity.

Area of Science:

Physics
Materials Science
Electrical Engineering

Background:

Millimeter-wave (mm-wave) systems require protection against high-power signals to prevent damage to sensitive receiver components.
Photonic limiting techniques offer a promising alternative or supplement to traditional electronic limiting circuits.

Purpose of the Study:

To demonstrate a free-space, reflective mm-wave limiter using a vanadium dioxide (VO2) based multilayer structure.
To investigate the intensity-dependent reflective properties of the VO2 multilayer for signal limiting applications.

Main Methods:

Experimental and numerical demonstration of a multilayer structure incorporating a nanolayer of vanadium dioxide (VO2).
Utilizing the insulator-to-metal phase transition of VO2, triggered by heat from incident signal intensity, to control reflectivity.

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Characterizing the limiter's performance under varying incident power levels, including Gaussian beams.

Main Results:

The multilayer structure functions as a variable reflector, controlled by incident wave intensity.
At low intensities, VO2 is dielectric, leading to strong resonant transmittance.
Above a threshold intensity, VO2 transitions to a metallic phase, rendering the multilayer highly reflective and safely dissipating excess power.

Conclusions:

The demonstrated VO2-based multilayer serves as an effective free-space reflective limiter for mm-wave signals.
The limiter protects sensitive components by transitioning to a high-reflectivity state above a critical power threshold.
The device exhibits a nearly constant output power for Gaussian beams beyond the limiting threshold, ensuring system integrity.