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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
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Homoatomic Polychalcogenide Nonlinear Optical Anionic Groups with Ultra-Large Optical Anisotropy.
Aoge Yao1,2, Fan Liu1,2, Bohui Xu1,2
1Functional Crystals Lab, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Journal of the American Chemical Society
|May 31, 2024
Summary
Homoatomic polychalcogenides (HAPCs) offer unique structures for advanced nonlinear optical (NLO) and birefringent materials. Certain HAPCs exhibit colossal birefringence and NLO effects, surpassing conventional materials.
Area of Science:
- Materials Science
- Solid State Chemistry
- Optoelectronics
Background:
- Developing advanced nonlinear optical (NLO) and birefringent materials requires functional motifs with large optical anisotropy.
- Homoatomic anionic clusters, such as polychalcogenides (HAPCs), present diverse structures and alignments.
- These structures offer potential for asymmetric features and anisotropic optical properties.
Purpose of the Study:
- To systematically investigate the nonlinear optical (NLO) and birefringent properties of binary and ternary homoatomic polychalcogenides (HAPCs).
- To explore the structure-property relationships in HAPCs for potential applications in advanced optical materials.
Main Methods:
- Utilized state-of-the-art first-principles calculations.
- Investigated 55 binary HAPCs (A₂Qn, n=2-5; A=Na, K, Rb, Cs; Q=S, Se, Te) and their ternary analogues.
- Analyzed structural chemistry, including chain-, ring-, and cage-like formations and dimensionality.
Main Results:
- Identified homoatomic anionic groups as novel mid-infrared NLO 'material genes'.
- Rb₂Te₃ and Na₂TeSe₂ demonstrated colossal birefringence (>1.0@10 μm) and NLO effects (>20 × AgGaS₂).
- Na₂Te₃ exhibited record-breaking birefringence (∼3.48@1 μm), highlighting HAPC's structural superiority for ultra-large birefringence.
Conclusions:
- Homoatomic polychalcogenides (HAPCs) possess unique structural advantages for designing novel optoelectronic materials.
- HAPCs offer significant potential for developing advanced NLO and birefringent materials with exceptional performance.
- The identified HAPC anionic groups serve as promising building blocks for future optical material design.
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