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Schematic showing the UV excitation of one PE-GaN stripe and the resultant photoluminescence emanating from the sidewalls.
SEM micrographs of (a) the cross section of one and (b) the plan-view of four uncoalesced PE-GaN stripe(s). The width and thickness of each stripe are 13.3 and , respectively. The sidewalls of the stripes are flat and mirrorlike.
Spectra of Phonon-assisted stimulated emission with Fabry-Pérot modes from a wide PE-GaN stripe acquired at using UV excitation power densities of (a) , (b) , and (a) . Inset shows enlargement of the spectrum (a). The mode spacing is estimated to be at the center wavelength of .
(a) TE- and (b) TM-polarized emission spectra acquired at using UV excitation power density of . Phonon-assisted stimulated emission was only observed in the TE-polarization spectrum.
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