Surface relief and refractive index gratings patterned in chalcogenide glasses and studied by off-axis digital holography
| Autor: | Giancarlo Pedrini, A. Meshalkin, Daniel Claus, Vladimir Abashkin, Veronica Cazac, Vladimir Katkovnik, Igor Shevkunov, E. Achimova |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Chalcogenide Holography Physics::Optics 02 engineering and technology Grating Diffraction efficiency 01 natural sciences law.invention 010309 optics chemistry.chemical_compound Optics law 0103 physical sciences Electrical and Electronic Engineering Engineering (miscellaneous) Diffraction grating business.industry 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics chemistry Digital holographic microscopy 0210 nano-technology business Refractive index Digital holography |
| Zdroj: | Applied optics. 57(3) |
| ISSN: | 1539-4522 |
| Popis: | Surface relief gratings and refractive index gratings are formed by direct holographic recording in amorphous chalcogenide nanomultilayer structures As2S3−Se and thin films As2S3. The evolution of the grating parameters, such as the modulation of refractive index and relief depth in dependence of the holographic exposure, is investigated. Off-axis digital holographic microscopy is applied for the measurement of the photoinduced phase gratings. For the high-accuracy reconstruction of the wavefront (amplitude and phase) transmitted by the fabricated gratings, we used a computational technique based on the sparse modeling of phase and amplitude. Both topography and refractive index maps of recorded gratings are revealed. Their separated contribution in diffraction efficiency is estimated. |
| Databáze: | OpenAIRE |
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