Rapid and Versatile Fabrication of High-Quality Thin Fiom One-Dimensional Optical Band Gap Materials on Planar and Curved Substrates using Sol-Gel Chemnistry

Date

Apr 12, 2013

Time

1:00 PM - 2:00 PM

Speaker

Dr. Moussa Barhoum

Affiliation

University of Utah

Language

en

Main Topic

Materialien

Other Topics

Materialien, Physik

Host

Ulrike Steere

Description

One-dimensional optical band gap materials are widely used elements in today’s information technology. However, the fabrication and optical tailoring of high quality one-dimensional optical band gap materials remains cumbersome and requires elaborate instrumentation. In this talk we will introduce a versatile, simple, rapid and inexpensive sol-gel technique for the fabrication of high quality one-dimensional optical band gap materials. These multilayer dielectric materials are fabricated from sol-gel solutions by alternately dipcoating single layers of TiO2 /SiO2 thin films onto a substrate followed by calcination at relatively low temperatures of 400-500°C. A novelty of this sol-gel synthesis route is an added shock-cooling step immediately following the calcination. We will discuss what effect this shock-cooling step has on crack-prevention and hence on the improved quality of these band gap materials. The optical properties of these band-gap materials are tailored and fine-tuned by controlling the number of alternating layers, the film thickness and the refractive index of the deposited thin-films. Furthermore, we will discuss attempts of magnetically functionalizing these optical band gap materials and measuring their magneto-optical effects using the dilute magnetic semiconductor effect of Co-ion doped crystalline TiO2.

Links

• Seminars at the IFW

Last modified: Apr 12, 2013, 9:38:26 AM