Title :
Room temperature lasing of micropillar with circular grating by liquid immersion laser micromachining
Author :
Wai Yuen Fu;Yuk Fai Cheung;Hoi Wai Choi
Author_Institution :
Department of Electrical and Electronic Engineering, the University of Hong Kong, Pokfulam Road, Hong Kong
Abstract :
We report on a room temperature lasing by micropillar fabricated by liquid-immersion laser micromachining. A 10.7 um micropillar was written directly on a thin film GaN LED wafer by a nanosecond-pulsed UV laser when submerged in deionized water. Whispering gallery mode lasing was observed from photoluminescence measurement with a Q factor of 176. The Q factor is further improved to 399 by the introduction of a circular grating fabricated using the same technique.
Keywords :
"Micromachining","Lasers","Gratings","Gallium nitride","Whispering gallery modes","Light emitting diodes","Q-factor"
Conference_Titel :
Microoptics Conference (MOC), 2015 20th
Print_ISBN :
978-4-8634-8487-0
DOI :
10.1109/MOC.2015.7416517
