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

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.
Authors:
; ; ;  [1] ;  [2]
  1. Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road (Hong Kong)
  2. Department of Electronic and Electrical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD (United Kingdom)
Publication Date:
OSTI Identifier:
22300099
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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