一种反射式毫米波光子限幅器
A reflective mm-wave photonic limiter
AI总结：
本文提出并验证了一种基于VO2纳米层热致相变的反射式毫米波光子限幅器，通过输入功率控制多层结构在透射与高反射状态间切换，实现低功率透射、高功率限幅保护。
摘要：
能够处理小信号的毫米波通信与雷达接收机必须受到保护，以免受高功率信号损害，因为高功率信号可能损坏敏感的接收机组件。除接收机前端的电子限幅电路外，许多此类系统可以说可以通过使用光子限幅技术来获得保护。本文中，我们从实验和数值两方面展示了一种自由空间反射式毫米波限幅器，该限幅器基于包含二氧化钒（VO2）纳米层的多层结构，该纳米层经历热致绝缘体-金属相变。该多层结构充当由输入功率控制的可变反射器。在低输入功率水平下，VO2保持介电态，多层结构表现出谐振透射。当输入功率超过阈值水平时，出现的金属相使多层结构具有高反射性，同时耗散一小部分输入功率而不会损坏限幅器。在高斯光束情况下，该限幅器在超过限幅阈值输入后具有几乎恒定的输出。
英文摘要：
Millimeter wave (mm-wave) communications and radar receivers capable of processing small signals must be protected from high-power signals, which can damage sensitive receiver 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 (VO2), experiencing a thermal insulator-to-metal transition. The multilayer acts as a variable reflector, controlled by the input power. At low input power levels, VO2 remains dielectric, and the multilayer exhibits resonant transmittance. When the input power exceeds a threshold level, the emerging metallic phase renders the multilayer highly reflective while 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.
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