超薄宽带反射式光限幅器
Ultrathin broadband reflective optical limiter
摘要：
光学限幅器是一种非线性器件，其特征在于透射率随着入射光强度的增加而降低，因此可以保护敏感部件免受高强度照明的影响。理想的光学限幅器在其活动（“限制”）状态下反射而不是吸收光，从而最大限度地降低限幅器本身损坏的风险。先前实现反射限制器的努力是基于将非线性层嵌入到相对厚的多层光子结构中，导致相当大的制造复杂性、降低的速度以及在某些情况下有限的工作带宽。我们通过使用二氧化钒（VO 2）中的绝缘体到金属的转变来克服这些权衡，以实现对通过孔径天线的谐振传输的强度依赖性调制。由于在绝缘体到金属的转变过程中光学性质的急剧变化，低品质因数谐振器足以实现器件透射率的高开关比。因此，我们的超薄反射限幅器（厚度约为自由空间波长的1/100）在工作波长（10 um时> 2 um）和入射角（距法线高达约50 $°$）方面是宽带的。
英文摘要：
Optical limiters are nonlinear devices that feature decreasing transmittance with increasing incident optical intensity, and thus can protect sensitive components from high-intensity illumination. The ideal optical limiter reflects rather than absorbs light in its active ("limiting") state, minimizing risk of damage to the limiter itself. Previous efforts to realize reflective limiters were based on embedding nonlinear layers into relatively thick multilayer photonic structures, resulting in substantial fabrication complexity, reduced speed and, in some instances, limited working bandwidth. We overcome these tradeoffs by using the insulator-to-metal transition in vanadium dioxide (VO2) to achieve intensity-dependent modulation of resonant transmission through aperture antennas. Due to the dramatic change of optical properties across the insulator-to-metal transition, low-quality-factor resonators were sufficient to achieve high on-off ratios in device transmittance. As a result, our ultra-thin reflective limiter (thickness ~1/100 of the free-space wavelength) is broadband in terms of operating wavelength (> 2 um at 10 um) and angle of incidence (up to ~50$°$ away from the normal).
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