Waveguide structures and functional elements of integrated optics systems based on volume holographic gratings in thin As₂S₃films

Abstract

We have measured the time resolved Stokes shift of the probe molecule quinoxaline in glass-forming solvents of different polarities under the condition of geometrical confinement, for which this solvation dynamics technique is particularly suitable. While solvation probes the local dielectric relaxation in polar liquids, it is associated with the local mechanical responses in non-polar systems. The effect of porous glasses on the relaxations of supercooled liquids is strongly dependent on the surface chemistry and can be rationalized on the basis of the cooperativity concept. We also present evidence for the heterogeneous nature of relaxation dynamics in nano-confined liquids. In a further experiment, in which the chromophores are selectively positioned at the liquid/solid interface, we observe that the relaxation in the immediate vicinity of the glass surface can be qualitatively similar to the bulk behaviour. †

Coherent Light Photo-modification, Mass Transport Effect, and Surface Relief Formation in AsxS100-x Nanolayers: Absorption Edge, XPS, and Raman Spectroscopy Combined with Profilometry Study

“…The numerous investigations of their fundamental physical and chemical properties have been already performed [3–6]. Unique structural, electronic, and optical properties determined their various applications.…”

Photoinduced Bragg Reflectors in As-S-Se/As-S Based Chalcogenide Glass Multilayer Channel Waveguides

“…The use of a multilayer structure is preferable to a single layer ChG waveguide, owing to its higher coupling efficiency, lower losses, and stronger nonlinear characteristics. As 2 S 3 (E g~2 .35 eV, a~10 3 cm -1 @ 514 nm) has been shown to be less photosensitive than As 24 S 38 Se 38 (E g~2 .1 eV, a~10 4 cm -1 @ 514 nm), but the latter has a much higher nonlinear index of refraction (n 2 1.75 X 10 -14 cm 2 /W @ 1550 nm) [11].…”

Photoinduced Bragg gratings in multilayer channel waveguides of chalcogenide glasses

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In recent years, amorphous chalcogenide glasses (ChG) have attracted much attention for applications in infrared communication systems and integrated optical circuits [ 1,2]. High transparency in the 1-10 pm wavelength region, large nonlinear index of refkaction, and low phonon energy of ChG make them very useful for applications in both passive and active photonic devices.

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