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Updated: May 28, 2025
Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
One-Dimensional Perovskite RbGeI3 with Large Optical Anisotropy
Huige Chen1,2, Deshuai Xiao3, Pifu Gong1
1Functional Crystals Lab, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Abstract:
Inorganic halide perovskites have been regarded as potential candidates for nonlinear optical (NLO) materials due to their large bandgaps and second-harmonic generation (SHG) effects. If these crystals exhibit large optical anisotropy, their birefringent phase-matching ability will undergo enhancement. In this study, a one-dimensional (1D) halide perovskite, RbGeI3, was experimentally synthesized. Its [GeI3]∞1 double chains are parallelly arranged, resulting in a large structural anisotropy with a birefringence of 0.122@1064 nm, the largest one in reported NLO-active inorganic halide perovskites, as determined from first-principles calculations. Furthermore, a comprehensive characterization involving Raman spectroscopy, the optical absorption spectrum, and powder SHG measurement was conducted to assess its suitability for NLO applications.
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