Spatial tailoring of the refractive index in infrared glass-ceramic films enabled by direct laser writing
| Autor: | Kathleen Richardson, Mia Truman, Casey M. Schwarz, Juejun Hu, Martin Richardson, Ilya Mingareev, Ian B. Murray, Jun Qin, Myungkoo Kang, Gufan Yin |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Infrared business.industry Chalcogenide Chalcogenide glass 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics Crystal chemistry.chemical_compound chemistry law 0103 physical sciences Dispersion (optics) Optoelectronics Laser power scaling Electrical and Electronic Engineering 0210 nano-technology business Refractive index |
| Zdroj: | Optics & Laser Technology. 126:106058 |
| ISSN: | 0030-3992 |
| DOI: | 10.1016/j.optlastec.2020.106058 |
| Popis: | The development of infrared gradient refractive index (GRIN) components relies on the ability to modify the refractive index and dispersion properties of suitable host materials with a high spatial selectivity and a sufficient magnitude of change. We present a novel multi-step approach to induce local refractive index changes in chalcogenide optical materials. Films with thicknesses between 1 and 40 µm fabricated from multi-component GeSe2-As2Se3-PbSe (GAP–Se) glass-ceramic materials were irradiated with continuous-wave and nanosecond-pulsed laser light, and post-processed with heat-treatments. A maximum local refractive index change of Δn = 0.088 across a broad spectral range in the infrared was realized. Spatial control of the refractive index variation was achieved through thermally-induced crystallization of a Pb-rich crystal phase. The magnitude of the index change scaled with the laser power and the exposure dose while the material maintained the required optical quality. The material performance validated in this study for thick films (20–40 µm films) reconfirms our ability to extend results from thin GAP-Se films towards novel optical designs. |
| Databáze: | OpenAIRE |
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