Sol-gel glass waveguides

Abstract

Abstract. Sol-gel processes show many promises for the development of low-loss, high-performance glass integrated optical circuits. Special attention is being paid to the preparation of composite glass films, where the properties of organic or inorganic dopant compounds included in the glass matrix are fully exploited. Nonlinear optical glass film waveguides have the potential to become key devices in the future, leading to further technical advances of fiber optic communication systems. This paper briefly reviews current activities in sol-gel glasses for integrated optics, with particular focus on silica-titania and semiconductor-doped films.

Local induction of calcium phosphate formation on TiO2 coatings on titanium via surface treatment with a CO2 laser

“…Because the manufacture of these devices requires local treatment of the gels, selective densification of the coatings can be achieved with direct laser writing. 10 The fact that silica and titania materials absorb in the ultraviolet (UV) and infrared (IR) spectral regions led to the use of excimer lasers (UV, 193-354 nm, depending on the gas mixtures used) and CO 2 lasers (IR, 10.6 m), with the application of CO 2 lasers being a preferably employed technique because of their broader availability and simplicity of operation. 10 The suitability of direct laser densification of sol-gel materials for producing optical devices has been reported by a number of research groups.…”

“…10 The fact that silica and titania materials absorb in the ultraviolet (UV) and infrared (IR) spectral regions led to the use of excimer lasers (UV, 193-354 nm, depending on the gas mixtures used) and CO 2 lasers (IR, 10.6 m), with the application of CO 2 lasers being a preferably employed technique because of their broader availability and simplicity of operation. 10 The suitability of direct laser densification of sol-gel materials for producing optical devices has been reported by a number of research groups. [11][12][13][14][15][16] Therefore, the application of direct laser densification to the manufacture of bioactive sol-gel-derived coatings would provide the following advantages over traditional furnace firing: (1) the substrate is only heated locally and (2) the coating can be processed selectively, which allows different areas of the same coating to have different properties.…”

Fabrication of inorganic–organic hybrid films for optical waveguide

“…The phenyl group possesses a large electronic polarizability because its electron cloud in p-bonding orbital is easily distorted. In this regard, PhTMOS is a good candidate material to control the refractive index in silica-based materials [15,16].…”

Planar Evanescent Wave Ammonia Sensor - Influence of Refractive Index Profile on Sensor Properties

“…Monomode waveguides are applied in sensor structures with phase modulation [3][4][5][6][7][8][9] and multimode waveguides are applied in sensor structures with amplitude modulation. Monomode planar uniform waveguides can be obtained with the application of plasma-enhanced vapour deposition (PECVD) [10], low-pressure chemical vapour deposition (LPCVD) [11], metal organic chemical vapour deposition (MOCVD) [12], pulsed laser deposition (PLD) [13] or sol-gel technology [3][4][5][6][7][8][14][15][16][17][18]. Planar waveguides of great modes quantity can be fabricated by ion exchange in glasses [19][20][21][22][23][24][25][26].…”