A solution-processed 1.53 mum quantum dot laser with temperature-invariant emission wavelength.
Opt Express
; 14(8): 3273-81, 2006 Apr 17.
Article
em En
| MEDLINE
| ID: mdl-19516469
ABSTRACT
Sources of coherent, monochromatic short-wavelength infrared (1-2 mum) light are essential in telecommunications, biomedical diagnosis, and optical sensing. Today's semiconductor lasers are made by epitaxial growth on a lattice-matched single-crystal substrate. This strategy is incompatible with integration on silicon. Colloidal quantum dots grown in solution can, in contrast, be coated onto any surface. Here we show a 1.53 mum laser fabricated using a remarkably simple process dipping a glass capillary into a colloidal suspension of semiconductor quantum dots. We developed the procedures to produce a smooth, low-scattering-loss film inside the capillary, resulting in a whispering gallery mode laser with a well-defined threshold. While there exist three prior reports of optical gain in infrared-emitting colloidal quantum dots [1,2,3], this work represents the first report of an infrared laser made using solution processing. We also report dlambda(max)/dT, the temperature-sensitivity of lasing wavelength, of 0.03 nm/K, the lowest ever reported in a colloidal quantum dot system and 10 times lower than in traditional semiconductor quantum wells.
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MEDLINE
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article