Open AccessGaN microwires as optical microcavities: whispering gallery modes Vs Fabry-Perot modes
Author(s) -
Pierre-Marie Coulon,
Maxime Hugues,
Blandine Alloing,
Emmanuel Beraudo,
M. Leroux,
Jesús ZúñigaPérez
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.018707
Subject(s) - whispering gallery wave , optics , materials science , fabry–pérot interferometer , whispering gallery , polarization (electrochemistry) , photoluminescence , spectral line , optoelectronics , free spectral range , refractive index , physics , wavelength , resonator , chemistry , astronomy
GaN microwires grown by metalorganic vapour phase epitaxy and with radii typically on the order of 1-5 micrometers exhibit a number of resonances in their photoluminescence spectra. These resonances include whispering gallery modes and transverse Fabry-Perot modes. A detailed spectroscopic study by polarization-resolved microphotoluminescence, in combination with electron microscopy images, has enabled to differentiate both kinds of modes and determined their main spectral properties. Finally, the dispersion of the ordinary and extraordinary refractive indices of strain-free GaN in the visible-UV range has been obtained thanks to the numerical simulation of the observed modes.