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An Omnidirectional Reflector and Microcavity Resonatorvia the Sol-Gel Method

Published online by Cambridge University Press:  10 February 2011

Kevin M. Chen ,
Andrew W. Sparks ,
Hsin-Chiao Luan ,
Desmond R. Lim ,
Kazumi Wada  and
Lionel C. Kimerling
Kevin M. Chen
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Andrew W. Sparks
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Hsin-Chiao Luan
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Desmond R. Lim
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Kazumi Wada
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Lionel C. Kimerling
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

Thin films of sol-gel SiO2 and TiO2 were used to fabricate two types of onedimensional photonic crystals: an omnidirectional reflector and microcavity resonator. The reflector consisted of six SiO2/TiO2 bilayers, designed with a stopband in the near infrared. Reflectance measurements over an incident angle range of 0–80° showed an omnidirectional band of 70 nm, which agrees with theoretical predictions for this materials system. The microcavity resonator consisted of a TiO2 Fabry-Perot cavity sandwiched between two SiO2/TiO2 mirrors of three bilayers each. We have fabricated a microcavity with resonance at λcavity = 1500nm and achieved a quality factor of Q=35. We measured a modulation in the cavity resonance frequency with a change of defect layer thickness and incident angle of light. This work demonstrates the feasibility of fabricating photonic crystals via the sol-gel method.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 597: Symposium PP – Thin Films for Optical Waveguide Devices & Materials … , 1999 , 75
Copyright
Copyright © Materials Research Society 2000

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