Imprinting gradient refractive index micro-structure in GeS2–Ga2S3–KCl glass for broadband diffraction grating
| Autor: | Lu Yunjun, Bin Liu, Yunhang Qi, Xiaoyan He, Changzhe Peng, Hongfei Chen, Jin Cao, Guang Yang, Yanfeng Gao, Feng Tang, Ke Tang, Guorong Chen, Dongchu Chen |
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| Rok vydání: | 2020 |
| Předmět: |
Diffraction
Materials science Organic Chemistry Poling Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry Wavelength Depletion region Transmittance Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Refractive index Diffraction grating Spectroscopy |
| Zdroj: | Optical Materials. 101:109766 |
| ISSN: | 0925-3467 |
| Popis: | A gradient refractive index (GRIN) microstructure covering visible to middle infrared wavelength is imprinted in chalcohalide glass through a simple and inexpensive microthermal poling process. The effects of poling voltage (U), temperature (T), and time (t) on diffraction, morphology, elemental distribution and transmittance of the glass are thoroughly investigated. An effective imprinting formation region of GRIN microstructure based on the U and T values is observed under a fixed t of 30 min. Deformation of morphology and diffraction order increase with increasing U and T saturated at approximately 750 V and 150 °C respectively. The process can be divided into three stages, adding voltage, maintaining voltage and decreasing temperature. During the front two stages, K+ ions depletion layer forms in subsurface of sample anode-side, accompanied by the transformation of homopolar bonds Ga–Ga and S–S into heteropolar bond Ga–S. Moreover, most parts of K+ ions migrate back to the depletion layer during the last stage. |
| Databáze: | OpenAIRE |
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