Impact of Surface Plasmon Polaritons on Silver Photodiffusion into As 2 S 3 Film
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Impact of Surface Plasmon Polaritons on Silver Photodiffusion into As2S3 Film Ivan Indutnyi 1 & Viktor Mynko 1 & Mykola Sopinskyy 1
&
Petro Lytvyn 1
Received: 4 May 2020 / Accepted: 31 August 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The effect of the surface plasmon polariton excitation at the silver–chalcogenide glass interface on the photostimulated diffusion of silver into chalcogenide was studied. The test sample was a two-layer Ag–As2S3 structure deposited on the diffraction gratings with a 899-nm period made using interference photolithography. Photostimulated changes were registered by measuring the kinetics and the angular dependences of the specular reflection of the 632.8-nm wavelength p-polarized light. It was found that the process of photostimulated diffusion of silver into the chalcogenide layer significantly accelerates at its initial stage when the surface plasmon polariton is excited at the Ag–As2S3 interface during irradiation. Thus, it promotes the increase in photosensitivity of the structure—when irradiated at an angle corresponding to the excitation of the plasmon, the entire photodoping process completes much faster. Keywords Surface plasmon polaritons . Photostimulated diffusion . Chalcogenide glass . Ag . As2S3
Introduction Chalcogenide glasses (ChG) and thin-film structures based on them are widely used in modern high-tech production. Most ChG applications are based on structural transformations in thin films of these glasses stimulated by external influences (for example, light beams) as well as photostimulated diffusion of silver into ChG films [1–6]. High-resolution recording media and technologies for their use as an inorganic resist [7, 8], a medium for holography and interference lithography [9], and non-volatile memory devices [10, 11] have been developed. The photostimulated diffusion of Ag in ChG had been investigated and is still being studied by many scientists, not only from a practical point of view, but also to determine the mechanism of the phenomenon [2, 12–15]. Stimulated diffusion is usually observed in a two-layer structure of ChG–Ag when irradiated with light of the intrinsic absorption of chalcogenide, as well as with the electron or ion beams. In previous studies, it was established [3, 12] that the first and decisive * Mykola Sopinskyy [email protected]; [email protected] 1
V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 41 Prospekt Nauky, Kyiv 03028, Ukraine
stage of photostimulated diffusion is the absorption of light in the ChG at the ChG–Ag interface, and that the Ag diffusion intensity depends on the light intensity at this interface. Therefore, increasing the intensity of photoactive light at the interface between silver and chalcogenide can stimulate the diffusion of the metal and substantially increase the sensitivity of ChG–Ag structures. One way to significantly increase the intensity of an electromagnetic field at the metal-dielectric interface is to excite surface
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