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![]() CAZAC, Veronica; MESHALKIN, Alexei; ACHIMOVA, Elena; ABASHKIN, Vladimir; KATKOVNIK, Vladimir; SHEVKUNOV, Igor; CLAUS, Daniel; GIANCARLO, Pedrini. Surface relief and refractive index gratings patterned in chalcogenide glasses and studied by off-axis digital holography. In: Applied Optics. 2018, nr. 3(57), pp. 507-513. ISSN 1559-128X. 10.1364/AO.57.000507 |
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Applied Optics | |
Numărul 3(57) / 2018 / ISSN 1559-128X | |
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DOI: 10.1364/AO.57.000507 | |
Pag. 507-513 | |
Rezumat | |
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. |
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Cuvinte-cheie Amorphous films, Chalcogenides, Diffraction gratings, holography, Maps, Microscopic examination, Semiconducting selenium compounds |
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