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Chiral Bismuth Halide Crystals: Polarizability-Driven Birefringence and Wave Plate Functionality
Quanlin Chen1, Zhiqiang Huang1, Xiaoting Liao1
1College of New Energy and Materials, Fujian Provincial Key Laboratory of Featured Materials in Biochemical Industry, Ningde Normal University, Ningde 352100, P. R. China.
Inorganic Chemistry
|October 15, 2025
Summary
Researchers developed a novel 0D chiral bismuth halide perovskite for advanced optical applications. This material significantly enhances birefringence, enabling efficient achromatic quarter-wave plates (QWPs) with a simplified structure.
Area of Science:
- Materials Science
- Optics
- Crystallography
Background:
- Birefringent crystals are crucial for optical devices like polarizing microscopes and wave plates.
- Current birefringent materials often have complex multilayered structures, limiting their practical application.
- There is a need for simpler, highly efficient birefringent materials for advanced optics.
Purpose of the Study:
- To report a novel 0D chiral bismuth halide perovskite with in-plane anisotropy.
- To demonstrate its potential for efficient birefringence and application in achromatic quarter-wave plates (QWPs).
- To introduce a new strategy for enhancing birefringence through structural polarizability engineering.
Main Methods:
- Synthesis and characterization of a 0D chiral bismuth halide perovskite.
- Investigation of its in-plane anisotropy and birefringent properties.
- Fabrication and testing of achromatic quarter-wave plates using the synthesized material.
Main Results:
- The 0D chiral perovskite exhibits efficient birefringence due to in-plane anisotropy.
- Chirality-induced structural polarizability amplified birefringence by over 5-fold compared to racemic forms.
- The material functioned as a QWP with broadband achromatic retardation from 510 to 800 nm.
Conclusions:
- A novel 0D chiral bismuth halide perovskite offers a simplified approach to advanced optical components.
- Structural polarizability engineering is an effective strategy for significantly boosting birefringence.
- This breakthrough advances the development of practical and efficient wave plate technologies.
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