|Title||A reversibly tunable photonic crystal nanocavity laser using photochromic thin film|
|Publication Type||Journal Article|
|Year of Publication||2011|
|Authors||D. Sridharan, R. Bose, H. Kim, G. S. Solomon, and E. Waks|
|Keywords||2011, CMAMO, Lasers, Multiple Fellows, Nanophotonics and photonic crystals, tunable|
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.