Surface relief and refractive index gratings patterned in chalcogenide glasses and studied by off-axis digital holography

Surface relief gratings and refractive index gratings are formed by direct holographic recording in amorphous chalcogenide nanomultilayer structures As S -Se and thin films As S . The evolution of the grating parameters, such as the modulation of refractive index and relief depth in dependence of th...

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Published inApplied optics. Optical technology and biomedical optics Vol. 57; no. 3; p. 507
Main Authors Cazac, V, Meshalkin, A, Achimova, E, Abashkin, V, Katkovnik, V, Shevkunov, I, Claus, D, Pedrini, G
Format Journal Article
LanguageEnglish
Published United States 20.01.2018
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Summary:Surface relief gratings and refractive index gratings are formed by direct holographic recording in amorphous chalcogenide nanomultilayer structures As S -Se and thin films As S . 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.
ISSN:2155-3165
DOI:10.1364/ao.57.000507