Helical-chiroptical nanowires generated orbital angular momentum for the detection of circularly polarized light

Abstract

In this work, we designed a type of organic chiral polymeric nanowire with strong orbital angular momentum to fabricate circularly polarized light detectors. In chiral polymeric nanowires, chirality induced orbital angular momentum could lead to the splitting of spin up and spin down energy levels, which determines the performance of circularly polarized light detection. In addition, chiral polymeric nanowire based circularly polarized light detectors exhibit excellent reversibility and stability after several hundred switching operations, which provides a solid footstone for potential applications.

Direct detection of circular polarized light in helical 1D perovskite-based photodiode

“…In contrast, the 1D chain extends to the carrier transporting direction in the device, resulting in the higher photoconductivity than 2D structure. In addition, the high photoconductivity in the helical 1D structure under CPL irradiation probably depends on the direction of the polarized electronic spin generated by selective absorption of CPL with angular momentum ( 17 , 28 ). These effects have been reported in chiral perovskites with strong spin-orbit coupling, which can be explained by spin-dependent optical selection rules and large Rashba splitting ( 29 – 31 ).…”

Chiral Lead‐Free Hybrid Perovskites for Self‐Powered Circularly Polarized Light Detection

“…Further, an anisotropy factor of photocurrent for the self‐powered photodetection of CPL is acquired to be 0.3, which reaches the unprecedented merit for the chiral hybrid perovskites. The high anisotropy factor is probably attributable to the polarized electronic spin induced by orbital angular momentum [14] . Spin orbit coupling and resulting spin splitting are expected in the compound constituted of heavy elements Bi and I, which may lead to large Rashba splitting in chiral structure lacking of inversion symmetry [15] .…”

“…The high anisotropy factor is probably attributable to the polarized electronic spin induced by orbital angular momentum. [14] Spin orbit coupling and resulting spin splitting are expected in the compound constituted of heavy elements Bi and I, which may lead to large Rashba splitting in chiral structure lacking of inversion symmetry. [15] To our best knowledge, it should be the first lead-free halide double perovskite for self-powered CPL detection and will enlighten the development of new "green" CPL detectors with prominent performance.…”

Circularly Polarized Photodetectors Based on Chiral Materials: A Review

“…Moreover, the detectivity value (D*) of the CPL detector based on chiral polythiophene exceeded 1.6 × 10 10 Jones ranging from 400 to 670 nm ( Figure 10C ), and it reached 1.25 × 10 11 Jones at 553 nm. Most importantly, the experimental results showed that the differential absorption between LCPL and RCPL had a small contribution to the detection of CPL, while chirality-induced OAM played an important role in the CPL detection for achiral PT nanowire–based CPL photodetectors ( Wang et al, 2020 ). This study plays a very important role in understanding the detection mechanism of CPL photodetectors.…”

“… (A) TEM and scheme of the chiral PT nanowire structure, (B) schematic diagram of the setup used for CPL detection, (C) wavelength-dependent detectivity ( D* ) of the chiral PT–based photodetectors, and (D) photocurrent of ITO/ZnO/chiral PT:PCBM/MoO 3 /Ag under the stimuli of left-handed and right-handed CPL illumination ( Wang et al, 2020 ). Reproduced with permission.…”