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Optical modes within III-nitride multiple quantum well microdisk cavities

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10 Author(s)
Mair, R.A. ; Department of Physics, Kansas State University, Manhattan, Kansas 66506-2601 ; Zeng, K.C. ; Lin, J.Y. ; Jiang, H.X.
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Optical resonance modes have been observed in optically pumped microdisk cavities fabricated from 50 Å/50 Å GaN/AlxGa1-xN(x∼0.07) and 45 Å/45 Å InxGa1-xN/GaN(x∼0.15) multiple quantum well structures. Microdisks, approximately 9 μm in diameter and regularly spaced every 50 μm, were formed by an ion beam etch process. Individual disks were pumped at 300 and 10 K with 290 nm laser pulses focused to a spot size much smaller than the disk diameter. 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 microdisk cavities. The spacings of these modes are consistent with those expected for modes within a resonant cavity of cylindrical symmetry, refractive index, and dimensions of the microdisks under investigation. The GaN-based microdisk cavity is compared with its GaAs counterpart and implications regarding future GaN-based microdisk lasers are discussed. © 1998 American Institute of Physics.

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Applied Physics Letters  (Volume:72 ,  Issue: 13 )