Ultraviolet lasing action in aligned ZnO nanowall

Abstract A vertically aligned ZnO nanowall arrays have been synthesized on a patterned ZnO buffer layer using an interference laser beam. The average height and thickness of the ZnO nanowall were 4 μm and 200 nm, respectively. Room-temperature ultraviolet (UV) lasing was obtained from single piece of ZnO nanowall detached from the substrate. The threshold power density for lasing was estimated to be about 80 kW/cm2. In addition, UV lasing from vertically aligned ZnO nanowall was also observed owing to the presence of holes. The lasing spectra had no regularity in the mode spacing and many different spatial modes, suggesting that the action was supported by the random lasing mechanism. The threshold power density for lasing was about 300 kW/cm2, which was much higher than that of the single piece of ZnO nanowall because of the leakage of the light into buffer layer.

[1]  High internal quantum efficiency ZnO nanorods prepared at low temperature , 2008 .

[2]  Moon-Ho Ham,et al.  ZnO-nanowire-inserted GaN/ZnO heterojunction light-emitting diodes. , 2007, Small.

[3]  P. Yang,et al.  High quantum efficiency of band-edge emission from ZnO nanowires. , 2011, Nano letters.

[4]  Yoshiki Nakata,et al.  Synthesis of ZnO Nanorods by Nanoparticle Assisted Pulsed-Laser Deposition , 2003 .

[5]  Brandon Redding,et al.  Speckle-free laser imaging using random laser illumination , 2011, Nature Photonics.

[6]  Bingqiang Cao,et al.  Whispering gallery modes in zinc oxide micro‐ and nanowires , 2010 .

[7]  H. C. Ong,et al.  FAR-FIELD CHARACTERISTICS OF RANDOM LASERS , 1999 .

[8]  Federico Capasso,et al.  Laser action in nanowires: Observation of the transition from amplified spontaneous emission to laser oscillation , 2008 .

[9]  W. Park,et al.  Electroluminescence in n‐ZnO Nanorod Arrays Vertically Grown on p‐GaN , 2004 .

[10]  Takafumi Yao,et al.  Plasma assisted molecular beam epitaxy of ZnO on c -plane sapphire: Growth and characterization , 1998 .

[11]  Makoto Ueda,et al.  Dielectrophoretic fabrication and characterization of a ZnO nanowire-based UV photosensor , 2006, Nanotechnology.

[12]  Robert P. H. Chang,et al.  Random lasers with coherent feedback , 2003 .

[13]  Tatsuo Okada,et al.  Patterned growth of ZnO nanowalls by nanoparticle-assisted pulsed laser deposition , 2014 .

[14]  D. Nakamura,et al.  Vertically aligned growth of ZnO nanonails by nanoparticle-assisted pulsed-laser ablation deposition , 2007, 2007 Conference on Lasers and Electro-Optics - Pacific Rim.

[15]  Tatsuo Okada,et al.  Aligned growth of ZnO nanowires by NAPLD and their optical characterizations , 2009 .

[16]  D. Nakamura,et al.  Position-controlled and catalyst-free growth of ZnO nanocrystals by nanoparticle-assisted pulsed laser deposition , 2014 .

[17]  Tatsuo Okada,et al.  Ultraviolet whispering-gallery-mode lasing in ZnO micro/nano sphere crystal , 2012 .

[18]  N. Koshizaki,et al.  Low-threshold and quasi-single-mode random laser within a submicrometer-sized ZnO spherical particle film , 2013 .

[19]  Roman J. B. Dietz,et al.  Co-existence of strongly and weakly localized random laser modes , 2009 .

[20]  Clement Yuen,et al.  Random laser action in ZnO nanorod arrays embedded in ZnO epilayers , 2004 .