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A reversibly tunable photonic crystal nanocavity laser using photochromic thin film

TitleA reversibly tunable photonic crystal nanocavity laser using photochromic thin film
Publication TypeJournal Article
Year of Publication2011
AuthorsD. Sridharan, R. Bose, H. Kim, G. S. Solomon, and E. Waks
JournalOptics Express
Volume19
Pagination5551
Date Publishedmar
ISSN1094-4087
Keywords2011, CMAMO, Lasers, Multiple Fellows, Nanophotonics and photonic crystals, tunable
Abstract

We demonstrate a reversibly tunable photonic crystal quantum dot laser using a photochromic thin film. The laser is composed of a photonic crystal cavity with a bare cavity Q as high as 4500 coupled to a high density ensemble of indium arsenide quantum dots. By depositing a thin layer of photochromic material on the photonic crystal cavities, the laser can be optically tuned smoothly and reversibly over a wavelength range of 2.68 nm. Lasing is observed at temperatures as high as 80 K in the 900-1000 nm near-infrared wavelength range. The spontaneous emission coupling factor is measured to be as high as $\beta$ = 0.41, indicating that the laser operates in the high-$\beta$ regime.

URLhttp://www.opticsexpress.org/abstract.cfm?URI=oe-19-6-5551