Configurable circular-polarization-dependent optoelectronic silent state for ultrahigh light ellipticity discrimination

Abstract

Filterless light-ellipticity-sensitive optoelectronic response generally has low discrimination, thus severely hindering the development of monolithic polarization detectors. Here, we achieve a breakthrough based on a configurable circular-polarization-dependent optoelectronic silent state created by the superposition of two photoresponses with enantiomerically opposite ellipticity dependences. The zero photocurrent and the significantly suppressed noise of the optoelectronic silent state singularly enhance the circular polarization extinction ratio (CPER) and the sensitivity to light ellipticity perturbation. The CPER of our device approaches infinity by the traditional definition. The newly established CPER taking noise into account is 3–4 orders of magnitude higher than those of ordinary integrated circular polarization detectors, and it remains high in an expanded wavelength range. The noise equivalent light ellipticity difference goes below 0.009° Hz−1/2 at modulation frequencies above 1000 Hz by a light power of 281 μW. This scheme brings a leap in developing monolithic ultracompact circular polarization detectors.

Low-dimensional van der Waals materials for linear-polarization-sensitive photodetection: materials, polarizing strategies and applications

“…As a pioneering attempt, Wei et al have put forward a distinct paradigm of geometric photodetectors realizing a substantial discrimination ratio of 84 and a detectivity of ellipticity down to 0.03 • Hz −1/2 [299]. In another study, Bu et al have achieved ultrahigh light ellipticity discrimination in a monolithic ultracompact circular polarization detector based on a configurable circularpolarization-dependent optoelectronic silent state with zero photocurrent and markedly suppressed noise [300]. Since the introduction of new functions relies only on the geometric designs, these schemes in theory can be exploited to other low-dimensional vdWMs with various electronic structures toward the detection of circular polarization state in various wavebands.…”

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“…[252,253] Recently, by constructing the metamaterials on the surface of a few-layered MoS 2 and introducing the concept of "optoelectronic silent state," Bu et al achieved a response with ultrahigh extinction ratio to the circular polarized light, which further laid the foundation for the practical application of LDMs. [254] Compared with the above two categories, the type-III LDPPs is furthest away from applications at the present stage because of the relative weak photoresponse and low compatibility with optical paths of traditional PPs. Many researches in this field are still focused on the property explorations of novel materials.…”

Dynamically Reconfigurable on-Chip Polarimeters Based on Nanoantenna Enabled Polarization Dependent Optoelectronic Computing

“…In addition, s ( x ) is symmetric about x = 0, leading to C l = C r . Then, the device reaches an optoelectronic silent state, corresponding to zero photocurrent ( I ph = 0) and low noise at ϕ = 0 or π/2 (Figure D). In this case, the device directly detects the Stokes parameter S 2 .…”