Linear Dichroism Transition and Polarization-Sensitive Photodetector of Quasi-one-dimensional Palladium Bromide

Abstract Perpendicular optical reversal of the linear dichroism transition has promising applications in polarization sensitive optoelectronic devices. We perform a systematical study on the in-plane optical anisotropy of quasi one-dimensional PdBr 2 by using combined measurements of the angle resolved polarized Raman spectroscopy (ARPRS) and anisotropic optical absorption spectrum. The analyses of ARPRS data validate the anisotropic Raman properties of the PdBr 2 flake. And anisotropic optical absorption spectrum of PdBr 2 nanoflake demonstrates distinct optical linear dichroism reversal. Photodetector constructed by PdBr 2 nanowire exhibits high responsivity of 747 A W -1 and specific detectivity of 5.8×10 12 Jones. And the photodetector demonstrates prominent polarization-sensitive photoresponsivity under 405 nm light irradiation with large photocurrent anisotropy ratio of 1.56, which is superior to those of most of previously reported quasi one-dimensional counterparts. Our study offers fundamental insights into the strong optical anisotropy exhibited by PdBr 2 , establishing it as a promising candidate for miniaturization and integration trends of polarization-related applications.