Abstract

Optically pumped multi-mode whispering-gallery mode (WGM) lasing has been observed in optically free-standing InGaN/GaN quantum well microdisks at room temperature. The 6.6μm optically isolated microdisks are patterned by microsphere lithography on GaN thin-films prepared by laser lift-off of the sapphire substrate, enabling superior optical confinement. The modes are determined to be of second order according to simulations. The lasing threshold is found to be 9.06mJ/cm2, with a quality factor Q of 770 evaluated from the dominant mode at λ=430.2nm, and a free space range (FSR) of 3.17 to 2.16 nm, which is mode-dependent.

© 2014 Optical Society of America

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