Abstract
In this report an all-optical photo-induced formation of surface relief gratings is shown. For the surface patterning of As2S3 and As4S1.5Se4.5 films a direct holographic recording setup with a 532 nm wavelength Nd:YAG CW laser light was used. Our investigations have shown that the light-induced mass transfer process strongly depends on the material itself and on the polarization of the light. It has been shown that an electric field intensity gradient has to be obtained to achieve a direct patterning. The evolution of a surface relief in relation to recording parameters and thickness of the sample has been investigated in detail.
Highlights
A fundamental research of all-optical or direct recording techniques provides a wide range of possible applications, such as the nano-/micropatterning of surfaces, as well as applications for the production of various-purpose optical elements
If we look closer to these two cases everything becomes clear; the most promising light distribution for the surface patterning consists of periodic s and p electric field components, and both intensity distributions have been shifted in respect to one another by a half-period
It has been determined that the highest possible efficiency of the all-optical surface relief holographic recording can be achieved using ±45-degree polarization
Summary
A fundamental research of all-optical or direct recording techniques provides a wide range of possible applications, such as the nano-/micropatterning of surfaces, as well as applications for the production of various-purpose optical elements. The obtained micro- and nanosurface patterns have already been demonstrated as optical polarizers [1], angular or spectral filters [2, 3], optical transmission devices [4], data storage devices [5], and even photonic crystals [6,7,8,9] They are used in the production of tunable lasers, where the wavelength can be varied and depends on the geometrical parameters of gratings [10, 11]. A number of scientific books have been written on this subject [12,13,14,15] These are just a few of the possible options that could be gained or that could be improved with this new all-optical surface patterning technique. This processing technique will continue to improve the performance of materials in existing applications and will open the door to new materials and novel applications that would not be achievable through other means
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