Self-powered Filterless On-chip Full-Stokes Polarimeter

TL;DR

This paper introduces a self-powered, filterless on-chip full-Stokes polarimeter using a MoS2 homojunction, capable of sensing polarization states without additional filters, with easy integration and compact size.

Contribution

It presents a novel, filterless, self-powered on-chip polarimeter based on MoS2 homojunctions, eliminating the need for complex metasurfaces or waveplates.

Findings

Operates in 650-690 nm wavelength range

Detects four Stokes parameters at zero bias

Easily integrated with silicon chips

Abstract

The detection of polarization states of light is essential in photonic and optoelectronic devices. Currently, the polarimeters are usually constructed with the help of waveplates or a comprehensive metasurface, which will inevitably increase the fabrication complexity and unnecessary energy loss. Here, we have successfully demonstrated a self-powered filterless on-chip full-Stokes polarimeter based on a single-layer MoS2/few-layer MoS2 homojunction. Combining the built-in electric field enhanced circular photogalvanic effect with the intrinsic optical anisotropy of MoS2 between in-plane and out-of-plane direction, the device is able to conveniently sense four Stokes parameters of incident light at zero bias without requiring an extra filtering layer, and can function in the wavelength range of 650-690 nm with acceptable average errors. Besides, this homojunction device is easy to integrate with silicon-based chips and could have much smaller sizes than metasurface based polarimeters. Our study thus provides an excellent paradigm for high-performance on-chip filterless polarimeters.