title: Lasing droplets in a microfabricated channel.
abstract: Lasing from spherical microdroplets ejected into a liquid medium with a lower refractive index is observed in a microchannel. A microfabricated device that combines droplet production and excitation/detection has been utilized. Droplets of 50 microm diameter containing a fluorescent dye were first detected and then excited through multimode fibers after their production at a T-junction. Images show intense lasing emission around the droplet rim. Spectra from the droplets exhibit morphology-dependent resonances that are redshifted relative to the bulk fluorescence emission from the dyes. The dependence of resonant peak intensities on the pump beam power is nonlinear.
authors.affiliation: Department of Physics, University of California, Davis, One Shields Avenue, Davis, California 95616, USA.
authors.forename: Melikhan
authors.initials: M
authors.lastname: Tanyeri
authors.forename: Richard
authors.initials: R
authors.lastname: Perron
authors.forename: Ian M
authors.initials: IM
authors.lastname: Kennedy
mesh_terms: D000388:Air; D015374:Biosensing Techniques; D004396:Coloring Agents / Q000494:pharmacology; D004867:Equipment Design; D019793:Fluorescein / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry; D007834:Lasers; D008027:Light; D009821:Oils; D055095:Optics and Photonics; D010316:Particle Size; D012235:Rhodamines / Q000737:chemistry; D012542:Scattering, Radiation; D013050:Spectrometry, Fluorescence / Q000379:methods; D014867:Water / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D005456:Fluorescent Dyes; D009821:Oils; D012235:Rhodamines; C026188:rhodamine 6G; D014867:Water; D019793:Fluorescein