Optically pumped ultraviolet lasing from nitride nanopillars at room temperature

Rui Chen; Sun, H. D.; Wang, T.; Hui, K. N.; Choi, H. W.
June 2010
Applied Physics Letters;6/14/2010, Vol. 96 Issue 24, p241101
Academic Journal
A vertical cavity structure composing of an in situ grown bottom AlxGa1-xN/AlyGa1-yN distributed Bragg reflector and a top SiO2/HfO2 dielectric mirror for ultraviolet (UV) emission has been demonstrated. Close-packed nanopillars with diameters of around 500 nm have been achieved by the route of nanosphere lithography combined with inductively-coupled plasma etching. Optically-pumped UV lasing at a wavelength of 343.7 nm (3.608 eV) was observed at room temperature, with a threshold excitation density of 0.52 MW/cm2. The mechanism of the lasing action is discussed in detail. Our investigation indicates promising possibilities in nitride-based resonant cavity devices, particularly toward realizing the UV nitride-based vertical-cavity surface-emitting laser.


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