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

Cazac Veronica; Meshalkin Alexei; Akimova Elena; Abashkin Vladimir; Katkovnik Vladimir; Shevkunov Igor; Claus Daniel; Giancarlo Pedrini

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887

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CAZAC, Veronica, MESHALKIN, Alexei, AKIMOVA, 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. DOI: https://doi.org/10.1364/AO.57.000507

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Applied Optics

Numărul 3(57) / 2018 / ISSN 1559-128X

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

DOI:https://doi.org/10.1364/AO.57.000507

Pag. 507-513

Cazac Veronica¹, Meshalkin Alexei¹, Akimova Elena¹, Abashkin Vladimir¹, Katkovnik Vladimir², Shevkunov Igor³², Claus Daniel⁴, Giancarlo Pedrini⁴

¹ Institute of Applied Physics, Academy of Sciences of Moldova,
² Tampere University of Technology,
³ Saint Petersburg State University,
⁴ Institute of Applied Optics, University of Stuttgart

Disponibil în IBN: 23 februarie 2018

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.

Cuvinte-cheie
Amorphous films, Chalcogenides, Diffraction gratings, holography, Maps, Microscopic examination, Semiconducting selenium compounds

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