Binary-phase zone-plate arrays based on hybrid solgel glass

Abstract

An organically modified silane zirconate-based solgel material is used for the fabrication of binary-phase zone-plate arrays. The synthesized hybrid solgel material has a negative tone under UV exposure and can be patterned by a UV-lithography process. The transmittance of the material is nearly 100%, and the refractive index is 1.52. Two different diffractive lens arrays with focal lengths of 5 and 42 cm have been fabricated. The average roughness of the zone surface is less than 20 nm. The diffraction efficiencies of the lens arrays are measured as a function of modulation depth and exposure dose. A diffraction efficiency of 30% is achieved.

Organo-silica–titania nanocomposite elaborated by sol–gel processing with tunable optical properties

“…For some time, research groups have been exploring the chemistry and physical properties of hybrid materials based on photopolymerisable methacryloxypropyltrimethoxysilane (MAPTMS) to produce optical thin films that are UV-patternable [2][3][4][5]. In this context, we were motivated to examine the possibility of expanding the accessible refractive index range of this class of materials, while keeping the material UV-curable.…”

Surface relief micro-optical elements built in hybrid sol-gel glass

“…Our SiO 2 /TiO 2 sol-gel is a negative tone photosensitive material, whereas, after the development the areas exposed to the highest dose are remained due to cross-linking and those with the lowest dose are dissolved in the developer. Details about the synthesis of the sol-gel film can be found in our previous work [1] and other references [2][3][4][5][6][7]. The hybrid sol-gel glass was synthesized by two solutions.…”

Photochemical Image Generation in a Cyanogel System Synthesized from Tetrachloropalladate(II) and the Trimetallic Mixed-Valence Complex [(NC)5FeII−CN−PtIV(NH3)4−NC−FeII(CN)5]4-: Consideration of Photochemical and Dark Mechanistic Pathways of Prussian Blue Formation

“…The initial liquid state of the sol−gel system enables unlimited control of sample size and shape. A number of silica and titania based sol−gel systems capable of photoinduced alteration of surface structure have been reported. − These systems typically consist of a tetravalent sol−gel backbone modified with photoactive substituents. The surface alteration mechanism usually involves the photoinduced polymerization or degradation of material, followed by a postphotochemical washing step .…”