Samanta Rabisankar, Mujumdar Sushil
Opt Lett. 2023 Aug 15;48(16):4241-4244. doi: 10.1364/OL.495297.
Wavefront shaping has emerged as a valuable technique in complex photonics, wherein the various eigenmodes of the disordered medium are selectively excited to control the overall transmission through the medium. The process utilizes active optical devices such as liquid crystal-based spatial light modulators (LC-SLM), deformable mirrors (DM), and digital micromirror devices (DMD). Among these, the latter is preferred for imaging through dynamic scattering media such as living biological tissues due to their high-speed refresh rate and increased resolution. This study employs a genetic algorithm along with binary amplitude modulation generated by a digital micromirror device to spatially and spectrally control the large spectral bandwidth through a scattering medium. We illustrate spatial single-point focusing of broadband light, multipoint focusing of broadband light, and programmable spectral filtering of the same through disordered samples.
波前整形已成为复杂光子学中的一项重要技术，其中无序介质的各种本征模被选择性激发，以控制通过该介质的整体传输。该过程利用有源光学器件，如基于液晶的空间光调制器（LC-SLM）、变形镜（DM）和数字微镜器件（DMD）。其中，由于数字微镜器件具有高速刷新率和更高的分辨率，因此更适合用于透过动态散射介质（如活体生物组织）进行成像。本研究采用遗传算法以及由数字微镜器件产生的二进制幅度调制，对通过散射介质的大光谱带宽进行空间和光谱控制。我们展示了宽带光的空间单点聚焦、宽带光的多点聚焦以及通过无序样品对其进行可编程光谱滤波。
