Mid‐Infrared Bipolar and Unipolar Linear Polarization Detections in Nb 2 GeTe 4 /MoS 2 Heterostructures
Year: 2023
Type: article
Abstract: Detecting and distinguishing light polarization states, one of the most basic elements of optical fields, have significant importance in both scientific studies and industry applications. Artificially fabricated structures, e.g., metasurfaces with anisotropic absorptions, have shown the capabilities of detecting polarization light and controlling. However, their operations mainly rely on resonant absorptions based on structural designs that are usually narrow bands. Here, a mid‐infrared (MIR) broadband polarization photodetector with high PRs and wavelength‐dependent polarities using a 2D anisotropic/isotropic Nb 2 GeTe 4 /MoS 2 van der Waals (vdWs) heterostructure is demonstrated. It is shown that the photodetector exhibits high PRs of 48 and 34 at 4.6 and 11.0 µm wavelengths, respectively, and even a negative PR of −3.38 for 3.7 µm under the zero bias condition at room temperature. Such interesting results can be attributed to the superimposed effects of a photovoltaic (PV) mechanism in the Nb 2 GeTe 4 /MoS 2 hetero‐junction region and a bolometric mechanism in the MoS 2 layer. Furthermore, the photodetector demonstrates its effectiveness in bipolar and unipolar polarization encoding communications and polarization imaging enabled by its unique and high PRs.
Source: Advanced Materials
Institutions: University of Electronic Science and Technology of China, Nanyang Technological University, Centre for OptoElectronics and Biophotonics, State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Beijing University of Technology, State Key Laboratory of Modern Optical Instruments, Zhejiang University, The Photonics Institute
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4386979893