Optically pumped whispering-gallery mode lasing from 2-μm GaN micro-disks pivoted on Si

Journal Article · Mon Jun 02 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4881183· OSTI ID:22300099

Zhang, Yiyun; Ma, Zetao; Zhang, Xuhui; Wang, T. ^[1]

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1. Department of Electronic and Electrical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD (United Kingdom)

2-μm micro-disks containing InGaN/GaN quantum wells supported on a tiny Si nanotip are fabricated via microsphere lithography followed by dry and wet etch processes. The micro-disks are studied by photoluminescence at both room-temperature and 10 K. Optically pumped blue lasing at room-temperature is observed via whispering-gallery modes (WGMs) with a lasing threshold as low as 8.43 mJ/cm{sup 2}. Optical resonances in the micro-disks are studied through numerical computations and finite-difference time-domain simulations. The WGMs are further confirmed through the measured broadband transmission spectrum, whose transmission minima coincide well with predicted WGM frequencies.

• OSTI ID: 22300099
• Journal Information: Applied Physics Letters, Vol. 104, Issue 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
GALLIUM NITRIDES
INDIUM COMPOUNDS
OPTICAL PUMPING
PHOTOLUMINESCENCE
QUANTUM WELLS
SILICON
SIMULATION
SPECTRA
SUBSTRATES
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0273-0400 K
TRANSMISSION