手性光场光电探测器研究进展

Circularly polarized light photodetector

手性光场与物质相互作用现象在药物筛选、生物传感、成像、量子光学等领域有着十分广泛的应用.传统的手性光场探测方法主要利用光学偏振元件,将圆偏振光转化为线偏振光或进行分束,实现对手性光的检测分析.但其复杂的结构和较大的体积给探测器件的微型化和集成化带来困难.近年来,直接探测光场手性特征的光电探测器逐渐获得关注,当前主要有三种方法实现对手性光场的直接探测:利用手性材料、手性微纳光学结构以及可将光场手性转化为特定方向光电流的新机理.本文对基于此三类直接探测光场手性的光电探测器的原理和研究进展进行综述.

The detection of circularly polarized light(CPL)is vital in a wide range of applications,such as drug screening,biosensing,imaging and quantum optics.However,traditional CPL detection methods use polarization devices to extract light chirality,which is difficult for system integration and miniaturization.This difficulty leads to the development of novel photodetectors that can directly respond to light chirality.Three main approaches are taken to achieve direct CPL detectors:material chirality,structural chirality and the nontrivial photodetection process,which can transfer spin information into the direction of the photocurrent.Here,we review the mechanisms and recent work of these three categories of direct CPL photodetectors.