Optical modes within III-nitride multiple quantum well microdisk cavities
- Department of Physics, Kansas State University, Manhattan, Kansas66506-2601 (United States)
- Department of Physics, Peking University, Beijing 100871, Peoples Republic of (China)
- Department of Electrical Engineering, Virginia Commonwealth University, Richmond, Virginia23284-3072 (United States)
- Department of Electrical and Computing Engineering, University of South Carolina, Columbia, South Carolina29208 (United States)
Optical resonance modes have been observed in optically pumped microdisk cavities fabricated from 50 {Angstrom}/50 {Angstrom} GaN/Al{sub x}Ga{sub 1{minus}x}N(x{approximately}0.07) and 45 {Angstrom}/45 {Angstrom} In{sub x}Ga{sub 1{minus}x}N/GaN(x{approximately}0.15) multiple quantum well structures. Microdisks, approximately 9 {mu}m in diameter and regularly spaced every 50 {mu}m, 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{endash}51 meV (both TE and TM) and (ii) the Whispering Gallery mode with a spacing of 15{endash}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. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 624840
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 13 Vol. 72; ISSN 0003-6951; ISSN APPLAB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Optical properties of GaN/AlGaN multiple quantum well microdisks
Observation of whispering gallery modes in nonpolar m-plane GaN microdisks