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Proceedings Paper

Tunable optical properties of photonic crystals and semiconductor microdisks using liquid crystals
Author(s): Karoline A. Piegdon; Heinrich Matthias; Cedrik Meier; Heinz-S. Kitzerow
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Paper Abstract

μThe combination of semiconductors and liquid crystals is extremely useful in order to fabricate integrated optical devices with tunable properties. The difference between the dielectric constants of the semiconductor and the liquid crystal ('dielectric contrast') is sufficiently high to obtain photonic band gap structures or resonant microcavities with high quality factor. At the same time, the characteristic frequencies can be controlled by temperature changes or external fields due to the thermo-, electro- or magneto-optic sensitivity of the liquid crystal. Here, previous investigations on microcavities embedded in silicon-based photonic crystals are reviewed and new results on integrated GaAs microdisks containing a light emitting layer of InAs quantum dots are presented. The latter show resonant modes with a typical width below 0.4 nm in the near infrared spectral range around 1.24 μm, which indicates a quality factor of 3500 and larger. By embedding a microdisk in a well-aligned liquid crystal and subsequent heating to the isotropic phase, a spectral shift of about 7 nm was observed. The results indicate a possible way of developing tunable light sources.

Paper Details

Date Published: 29 January 2008
PDF: 9 pages
Proc. SPIE 6911, Emerging Liquid Crystal Technologies III, 69110J (29 January 2008); doi: 10.1117/12.774194
Show Author Affiliations
Karoline A. Piegdon, Univ. of Duisburg-Essen (Germany)
Heinrich Matthias, Univ. of Paderborn (Germany)
Cedrik Meier, Univ. of Duisburg-Essen (Germany)
Heinz-S. Kitzerow, Univ. of Paderborn (Germany)

Published in SPIE Proceedings Vol. 6911:
Emerging Liquid Crystal Technologies III
Liang-Chy Chien, Editor(s)

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