We propose and analyze a new photonic crystal cavity design that supports a dipole mode with a quality factor greater than 20, 000. Such a high quality factor is obtained by precise tuning of the cavity length with minimal disruption of the surrounding photonic crystal. A fabrication procedure based on dry etching of InGaAsP material in HI/H <sub>2</sub>/Ar is used to demonstrate photonic crystal lasers with smooth and straight sidewalls. These room-temperature lasers concentrate optical energy in air and are suitable for use as tunable lasers and chemical sensors.
© 2004 Optical Society of America
Marko Loncar, *Michael Hochberg, Axel Scherer, and Yueming Qiu, "High quality factors and room-temperature lasing in a modified single-defect photonic crystal cavity," Opt. Lett. 29, 721-723 (2004)