High Performance Broadband Full Linear Polarimeter based on ReS₂ Nanobelts

Abstract Polarization‐sensitive photodetectors can simultaneously sense the polarization states and intensity of light. Traditional polarimeters integrate photodetectors with complex and bulky optical systems such as polarizers and waveplates, which can not meet the current demand of on‐chip polarization photonic devices. This work has demonstrated a full linear polarization polarimeter based on two independent ReS₂ nanobelt devices vertically stacked with a designed twist angle. The device achieves a high responsivity (959 A W⁻¹) without applying an external gate voltage. In addition, the ReS₂ nanobelt photodetector displays a strong polarization‐sensitive photoresponse with a linear dichroic ratio of 1.72 at 665 nm. By utilizing those two vertically stacked nanobelt devices, the linear polarization states of the incident light can be distinguished in a wide range of wavelengths from 590 to 800 nm. This study provides a simple route for future polarization‐sensitive optoelectronic devices.