We demonstrate Raman lasing near 650 nm in pure water microdroplets located on a superhydrophobic surface. In the experiments, stationary, pure water microdroplets were prepared on a superhydrophobic surface and excited by a pulsed, frequencydoubled Nd:YAG laser at 532 nm. Intense laser emission was observed at frequencies corresponding to the whispering gallery mode resonances of the water mic...

We propose a new single-defect microcavity which supports well-confined whispering gallery mode in octagonal quasiphotonic crystals (OQPC) by shifting the eight nearest air holes around the cavity. Lasing action is observed and compared with the calculated results obtained using the finite-difference time-domain method. We also investigate the threshold dependence on the number of lattice perio...

A microcavity surface-emitting coherent electroluminescent device operating at room temperature under pulsed current injection is described. The microcavity is formed by a single defect in the center of a 2-D photonic crystal consisting of a GaAsbased heterostructure. The gain region consists of two 70Å compressively strained In0 15Ga0 85As quantum wells, which exhibit a spontaneous emission pe...

Qinghai Song, Wei Fang, Boyang Liu, Seng-Tiong Ho, Glenn S. Solomon, and Hui Cao* Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8482, USA Joint Quantum Institute, NIST and University of Maryland, Gaithersburg, Maryland 20899, USA Department of Electrical Engineering and Computing Science, Northwestern University, Evanston, Illinois 60208, USA Received 31 May 2009;...

Ultrasensitive nanoparticle detection holds great potential for early-stage diagnosis of human diseases and for environmental monitoring. In this work, we report for the first time, to our knowledge, single nanoparticle detection by monitoring the beat frequency of split-mode Raman lasers in high-Q optical microcavities. We first demonstrate this method by controllably transferring single 50-nm...