Optically anisotropic porous silicon microlenses with tunable refractive indexes and birefringence profiles
| Autor: | Corey A. Richards, Matthew K. Clawson, J. A. N. T. Soares, Christian R. Ocier, Neil A. Krueger, Daniel Bacon-Brown, Paul V. Braun |
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| Rok vydání: | 2020 |
| Předmět: |
Birefringence
Materials science business.industry Optical testing Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology Porous silicon 01 natural sciences Electronic Optical and Magnetic Materials law.invention 010309 optics Lens (optics) Optics law 0103 physical sciences Divergence angle 0210 nano-technology business Anisotropy Effective refractive index Refractive index |
| Zdroj: | Optical Materials Express. 10:868 |
| ISSN: | 2159-3930 |
| Popis: | The effect of spatially varying birefringence on the focusing behavior of porous silicon (PSi) and porous silicon dioxide (PSiO2) gradient refractive index (GRIN) lenses is investigated. Both materials attain broad, tunable refractive indexes and birefringence profiles, with PSi having a maximum birefringence of ∼0.26 and PSiO2 a reduced maximum birefringence of ∼0.03 at 633 nm. These GRIN lenses exhibit polarization-dependent split focusing behavior, wherein the divergence angle between the twin foci increases with the birefringence gradient. PSi’s large birefringence allows the divergence angle to be tuned such that light focuses away from the center of the lens. These GRIN elements demonstrate how tunable birefringent materials can be used to engineer polarization-selective optical responses. |
| Databáze: | OpenAIRE |
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