Circularly polarized light detector based on 2D embedded chiral nanostructures

Recently, the generation and detection of circularly polarized light (CPL) have attracted much attention due to their wide applications in various optical devices and techniques. The three-dimensional chiral metamaterials have acquired a giant chiral response, but complex processes make it difficult to be integrated directly into nanophotonic devices. In this work, a type of two-dimensional CPL photodetector based on the embedding nanoelectrodes is proposed. It is shown that quantum efficiency and circular polarization dichroism for the detector can be achieved as high as 23% and 75% at the wavelengths of 1550 nm, respectively. Furthermore, the difference in photoresponsivity is 21 mA W-1.