Linear Dichroism Conversion in Quasi‐1D Perovskite Chalcogenide

Authors:
Publisher website
Google Scholar
Abstract
Anisotropic photonic materials with linear dichroism are crucial components in many sensing, imaging, and communication applications. Such materials play an important role as polarizers, filters, and waveplates in photonic devices and circuits. Conventional crystalline materials with optical anisotropy typically show unidirectional linear dichroism over a broad wavelength range. The linear dichroism conversion phenomenon has not been observed in crystalline materials. The investigation of the unique linear dichroism conversion phenomenon in quasi‐1D hexagonal perovskite chalcogenide BaTiS3is reported. This material shows a record level of optical anisotropy within the visible wavelength range. In contrast to conventional anisotropic optical materials, the linear dichroism polarity in BaTiS3makes an orthogonal change at an optical wavelength corresponding to the photon energy of 1.78 eV. First‐principles calculations reveal that this anomalous linear dichroism conversion behavior originates from the different selection rules of the parallel energy bands in the BaTiS3material. Wavelength‐dependent polarized Raman spectroscopy further confirms this phenomenon. Such a material, with linear dichroism conversion properties, could facilitate the sensing and control of the energy and polarization of light, and lead to novel photonic devices such as polarization‐wavelength selective detectors and lasers for multispectral imaging, sensing, and optical communication applications.
Funding Information
  • Army Research Office (W911NF‐18‐1‐0268, W911NF‐19‐1‐0137)
  • Air Force Office of Scientific Research (FA9550‐15‐1‐0514, FA9550‐16‐1‐0335)
  • National Science Foundation (EFMA‐1542815)
  • National Basic Research Program of China (2016YFA0301204)
  • National Natural Science Foundation of China (11874350, 11604326, 11474277, 11434010)

This publication has 50 references indexed in Scilit: