Observation of whispering gallery modes in nonpolar m-plane GaN microdisks

Tamboli, Adele C.; Schmidt, Mathew C.; Hirai, Asako; DenBaars, Steven P.; Hu, Evelyn L.
June 2009
Applied Physics Letters;6/22/2009, Vol. 94 Issue 25, p251116
Academic Journal
We have fabricated nonpolar GaN/InGaN microdisks using band-gap selective photoelectrochemical etching. These microdisks have a smoother optical cavity than our previous c-plane microdisks, and they support whispering gallery modes with quality factors as high as 2000 after a focused ion beam treatment to the quantum wells. Because of the lack of a Stokes shift in the quantum wells of these m-plane disks, absorption losses play a much more significant role than in our earlier c-plane microdisks, and the light which couples into the modes is emission from the InGaN post rather than the quantum wells within the cavity.


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