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Linear Dichroism Conversion in Quasi-1D Perovskite Chalcogenide
Jiangbin Wu1, Xin Cong2,3, Shanyuan Niu4
1Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, 90089, USA.
Advanced Materials (Deerfield Beach, Fla.)
|June 26, 2019
Summary
Researchers discovered a new material, BaTiS3, exhibiting unique linear dichroism conversion. This anisotropic photonic material could revolutionize optical sensing and communication technologies.
Area of Science:
- Photonics and Materials Science
- Optics and Spectroscopy
Background:
- Anisotropic photonic materials with linear dichroism are vital for sensing, imaging, and communication.
- Conventional materials exhibit unidirectional linear dichroism, lacking polarity conversion.
- Linear dichroism conversion has not been previously observed in crystalline materials.
Purpose of the Study:
- To investigate the novel linear dichroism conversion phenomenon in quasi-1D hexagonal perovskite chalcogenide BaTiS3.
- To explore the potential of BaTiS3 as a record-level optically anisotropic material in the visible spectrum.
Main Methods:
- First-principles calculations to understand the origin of anomalous behavior.
- Wavelength-dependent polarized Raman spectroscopy for experimental validation.
Main Results:
- BaTiS3 exhibits a record level of optical anisotropy in the visible wavelength range.
- The material demonstrates an orthogonal change in linear dichroism polarity at 1.78 eV photon energy.
- Calculations revealed that differing selection rules for parallel energy bands cause this anomalous behavior.
Conclusions:
- BaTiS3 is the first crystalline material observed to exhibit linear dichroism conversion.
- This property allows for sensing and controlling light's energy and polarization.
- Potential applications include novel photonic devices like polarization-wavelength selective detectors and lasers for advanced optical technologies.
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