A reflective millimeter-wave photonic limiter

• Published in: Science advances 2022-01, Vol.8 (2), p.eabh1827-eabh1827
• Main Authors: Kononchuk, Rodion, Suwunnarat, Suwun, Hilario, Martin S, Baros, Anthony E, Hoff, Brad W, Vasilyev, Vladimir, Vitebskiy, Ilya, Kottos, Tsampikos, Chabanov, Andrey A
• Format: Article
• Language: English
• Subjects: Applied Physics; Applied Sciences and Engineering; Physical and Materials Sciences; SciAdv r-articles
• ISSN: 2375-2548; 2375-2548
• DOI: 10.1126/sciadv.abh1827

Millimeter-wave (mm-wave) communications and radar receivers must be protected from high-power signals, which can damage their sensitive components. Many of these systems arguably can be protected by using photonic limiting techniques, in addition to electronic limiting circuits in receiver front-ends. Here we demonstrate, experimentally and numerically, a free-space, reflective mm-wave limiter based on a multilayer structure involving a nanolayer of vanadium dioxide VO , which experiences a heat-related insulator-to-metal phase transition. The multilayer acts as a variable reflector, controlled by the incident wave intensity. At low intensities VO remains dielectric, and the multilayer exhibits strong resonant transmittance. When the incident intensity exceeds a threshold level, the emerging metallic phase renders the multilayer highly reflective while safely dissipating a small portion of the input power, without damage to the limiter. In the case of a Gaussian beam, the limiter has a nearly constant output above the limiting threshold input.