Spatiotemporal control of optical wavefronts is of great importance in numerous free-space optical applications including imaging in 3D and through scattering media, remote sensing, and generation of various beam profiles for microscopy. Progress in these applications is currently limited due to lack of compact and high-speed spatial light modulators. Here we report an active antenna comprising a free-space coupled asymmetric Fabry–Perot resonator that produces a phase-dominant thermo-optic modulation of reflected light at frequencies approaching tens of kilohertz. As a proof of concept for spatial light modulation, we demonstrate a 6 × 6 array of such active antennas with beam deflection capability. The robust design of our silicon-based active antenna will enable large-scale integration of high-speed, phase-dominant spatial light modulators.

中文翻译：

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硅基有源谐振天线的高速，相位主导的空间光调制

在许多自由空间光学应用中，包括3D成像以及通过散射介质成像，遥感以及生成各种用于显微镜的光束轮廓，光学波前的时空控制非常重要。由于缺少紧凑和高速的空间光调制器，目前在这些应用中的进展受到限制。在这里，我们报告了一种有源天线，其中包括一个自由空间耦合的非对称Fabry-Perot谐振器，该谐振器在频率接近几十千赫兹时产生反射光的相位主导型热光调制。作为空间光调制概念的证明，我们演示了具有波束偏转功能的此类有源天线的6×6阵列。我们基于硅的有源天线的坚固设计将实现大规模，高速，相位为主的空间光调制器的集成。