Stimulated emission from free-standing GaN/Si micro-disk structures

Arrays of pivoted GaN microdisks have been fabricated on GaN/Si material by a combination of dry and wet etching. The Si material beneath the GaN microdisks is removed by wet etching, leaving behind a fine pillar to support the disks. The top and botton faces of the microdisks are optically smooth, suitable for forming optical cavities. Resonant modes, corresponding to whispering gallery modes, are observed in the photoluminescence spectra. Stimulated emission is achieved at higher optical pumping intensities. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.link_to_subscribed_fulltex