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Preparation of Silica and Titania Aerogels with Nonlinear Optical Properties

Lisinski, Susanne and Schaniel, Dominik and Ratke, Lorenz and Woike, Theo (2006) Preparation of Silica and Titania Aerogels with Nonlinear Optical Properties. Junior Euromat, 2006-09, Lausanne.

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Official URL: http://www.junior-euromat.fems.org/

Abstract

The projects aims to synthesize new functional SiO2 and TiO2 aerogels with nonlinear optical properties by incorporation of nano-micro sized particles of ferroelectrical character into a transparent matrix composed of a nanostructured silica or titania aerogel. The objective is to measure frequency doubling (second harmonic generation, SHG) on aerogel samples without and with oriented ferroelectrical particles. On focussing a visible infrared laser beam (1064nm) onto a sample a visible green light (532nm) will be generated. A homogenous distribution of these particles in an aerogel is achieved by gelation under reduced gravity conditions. With gravitation the particles would settle during the gelation. These ferroelectrical particles are an important class of materials. They have a spontaneous electric dipole moment in zero electric field. These ferroelectric materials are for example BaTiO3, KNbO3, LiNbO3, LiTaO3. Because of the electric dipole moment the particle could be oriented in the silica matrix with an external electrical field. The orientation of the particles should happen during the gelation when the solution makes a phase transformation from the liquid into the solid phase. The SHG efficiency could be better, when the particles are oriented.

Document Type:Conference or Workshop Item (Poster)
Title:Preparation of Silica and Titania Aerogels with Nonlinear Optical Properties
Authors:
AuthorsInstitution or Email of Authors
Lisinski, SusanneUNSPECIFIED
Schaniel, DominikUniversität zu Köln
Ratke, LorenzUNSPECIFIED
Woike, TheoUniversität zu Köln
Date:September 2006
Keywords:SHG, Sol-Gel
Event Title:Junior Euromat
Event Location:Lausanne
Event Type:international Conference
Event Dates:2006-09
Organizer:FEMS
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Susanne Lisinski
Deposited On:24 Aug 2007
Last Modified:27 Apr 2009 14:17

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