Optical resonance modes have been observed in optically pumped microdisk cavities fabricated from 50 angstroms/50 angstroms GaN/AlxGa1-xN (x to approximately 0.07) and 45 angstroms/45 angstroms InxGa1-xN/GaN (x to approximately 0.15) multiple quantum well structures. Microdisks, approximately 9 μm in diameter and regularly spaced every 50 μm, were formed by ion beam etch process. Individual disk was pumped from 10 K to 300 K with 290 nm laser pulses focused to a spot size much smaller than the disk diameter. Optical properties of these microdisks have been studied by picosecond time-resolved photoluminescence (PL) spectroscopy. From cw PL emission spectra, optical modes corresponding to (i) the radial mode type with a spacing of 49-51 meV (both TE and TM) and (ii) the Whispering gallery mode with a spacing of 15-16 meV were observed in the GaN-based microdisk cavities. The spacings of these modes are consistent with theoretical calculation. The implications of our results to III-Nitride microdisk lasers are discussed.
|Number of pages||6|
|Journal||Proceedings of SPIE - The International Society for Optical Engineering|
|State||Published - 1998|
|Event||Proceedings of the 1998 Conference on Semiconductor Lasers III - Beijing, China|
Duration: Sep 16 1998 → Sep 18 1998