Whispering gallery mode lasing from InGaN/GaN quantum well microtube.
Opt Express
; 25(15): 18072-18080, 2017 Jul 24.
Article
em En
| MEDLINE
| ID: mdl-28789297
ABSTRACT
In this work, we have successfully fabricated microtubes by strain-induced self-rolling of a InGaN/GaN quantum wells nanomembrane. Freestanding quantum wells microtubes, with a diameter of 6 µm and wall thickness of 50 nm, are formed when the coherently strained InGaN/GaN quantum wells heterostructure is selectively released from the hosting substrate. Periodic oscillations due to whispering-gallery modes resonance were found superimposed on photoluminescence spectra even at low optical excitation power. With increasing pumping power density, the microtube is characterized by a stimulated emission with a threshold as low as 415 kW/cm2. Such emission shows predominant TM polarization parallel to the microtube axis.
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MEDLINE
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En
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2017
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Article