Ultralow Dispersion Multicomponent Thin‐Film Chalcogenide Glass for Broadband Gradient‐Index Optics
| Autor: | Ivan Divliansky, Leonid B. Glebov, Stephen Aiken, Laura Sisken, Teodor Malendevych, Myungkoo Kang, Justin Cook, Martin Richardson, Alexej Pogrebnyakov, Clara Rivero-Baleine, Kathleen Richardson, Andrew Swisher, Carlo G. Pantano, Charmayne Lonergan, Fedor Kompan, Theresa S. Mayer, Andrew Kirk, Liu Liu |
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| Rok vydání: | 2018 |
| Předmět: |
Nanocomposite
Materials science genetic structures business.industry Mechanical Engineering Chalcogenide glass 02 engineering and technology Grating Photothermal therapy 021001 nanoscience & nanotechnology Laser 01 natural sciences law.invention 010309 optics Optics Nanocrystal Mechanics of Materials law 0103 physical sciences General Materials Science sense organs Thin film 0210 nano-technology business Refractive index |
| Zdroj: | Advanced Materials. 30:1803628 |
| ISSN: | 1521-4095 0935-9648 |
| Popis: | A novel photothermal process to spatially modulate the concentration of sub-wavelength, high-index nanocrystals in a multicomponent Ge-As-Pb-Se chalcogenide glass thin film resulting in an optically functional infrared grating is demonstrated. The process results in the formation of an optical nanocomposite possessing ultralow dispersion over unprecedented bandwidth. The spatially tailored index and dispersion modification enables creation of arbitrary refractive index gradients. Sub-bandgap laser exposure generates a Pb-rich amorphous phase transforming on heat treatment to high-index crystal phases. Spatially varying nanocrystal density is controlled by laser dose and is correlated to index change, yielding local index modification to ≈+0.1 in the mid-infrared. |
| Databáze: | OpenAIRE |
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