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Proceedings Paper

Activating photonic crystal membrane nanocavities by infiltrating with liquid crystals or luminescent colloidal nanocrystals
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Paper Abstract

Liquid crystal (LC, Merk 5 CB) is infiltrated into active, InAs quantum dots embedded, InGaAsP membrane type nanocavities to investigate the possible effect of the LC orientation on active cavity tuning. The tuning is demonstrated thermally and thermo-optically. The thermal tuning showed that the cavity modes can be tuned in opposite directions and exhibits a sudden change at the clearing temperature. The mechanism relies on the existence of both ordinary and extraordinary refractive indices of the liquid crystal due to its molecular alignment inside the voids. It shows that the electric field distribution of cavity modes can have a substantial component parallel to the LC director. The average electric field orientation with respect to the LC orientation can be mode dependent, so that different modes can be dominated by either branch of the LCs refractive index. Thermo-optic tuning of the modes is obtained when the power of the excitation laser is increased from 40 μW to 460 μW. A large and a reversible blueshift of more than 10 nm of the cavity modes is observed which is attributed to temperature induced liquid transport. InGaAsP type of nanocavities, without InAs quantum dots were infiltrated with PbSe colloidal quantum dots to obtain a comparison of internal light sources either in the semiconductor or in the holes.

Paper Details

Date Published: 12 May 2010
PDF: 8 pages
Proc. SPIE 7713, Photonic Crystal Materials and Devices IX, 77130E (12 May 2010); doi: 10.1117/12.854211
Show Author Affiliations
Mehmet A. Dündar, Technische Univ. Eindhoven (Netherlands)
Christina Christova, Technische Univ. Eindhoven (Netherlands)
Andrei Y. Silov, Technische Univ. Eindhoven (Netherlands)
Fouad Karouta, Technische Univ. Eindhoven (Netherlands)
Richard Nötzel, Technische Univ. Eindhoven (Netherlands)
Martijn Wienk, Technische Univ. Eindhoven (Netherlands)
Huub Salemink, Technische Univ. Delft (Netherlands)
Rob W. van der Heijden, Technische Univ. Eindhoven (Netherlands)

Published in SPIE Proceedings Vol. 7713:
Photonic Crystal Materials and Devices IX
Hernán R. Míguez; Sergei G. Romanov; Lucio Claudio Andreani; Christian Seassal, Editor(s)

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