title: A reversibly tunable photonic crystal nanocavity laser using photochromic thin film.
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 β=0.41, indicating that the laser operates in the high-β regime.
authors: Department of Electrical Engineering and Institute of Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland, USA. sdeepak@umd.edu
authors: Deepak
authors: D
authors: Sridharan
authors: Ranojoy
authors: R
authors: Bose
authors: Hyochul
authors: H
authors: Kim
authors: Glenn S
authors: GS
authors: Solomon
authors: Edo
authors: E
authors: Waks