We present a study of the Ku-band tunability of the surface plasmon response of a gaseous plasma resonator generated by laser-induced gas breakdown. Tuning is achieved by varying gas pressure and laser pulse energy. Microwave scattering characteristics of the plasma resonator are obtained using an experimental configuration in which a waveguide is loaded with a single plasma element. Optical imaging of the laser plasma is used to characterize the time-dependent plasma size. Complex transmission waveforms are attributed to the dynamic expansion of the plasma, resulting first in a sweep through the principle Mie resonance, followed by strong reflection of the incident wave due to bulk plasma loading as the plasma expands to significantly fill the waveguide. The described resonator has the potential to be used in an all-plasma metamaterial with tunable opacity and resonance frequency.

我们研究了由激光诱导气体击穿产生的气态等离子体谐振器的表面等离子体响应的 Ku 波段可调性。调谐是通过改变气体压力和激光脉冲能量来实现的。使用实验配置获得等离子体谐振器的微波散射特性，其中波导加载有单个等离子体元件。激光等离子体的光学成像用于表征与时间相关的等离子体尺寸。复杂的传输波形归因于等离子体的动态膨胀，首先导致通过 Mie 共振原理的扫描，然后随着等离子体膨胀以显着填充波导，由于体等离子体负载导致入射波的强反射。