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Applied Physics Letters / Volume 97 / Issue 17 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 97, 171101 (2010); http://dx.doi.org/10.1063/1.3503605 (3 pages)

Ultraviolet stimulated emission in periodically polarity-inverted ZnO structures at room temperature

Jinsub Park1,2, Takenari Goto2, Sung Hyun Park3, Jun-seok Ha4, Euijoon Yoon1,3, and Takafumi Yao2

1Department of Materials Science and Engineering, WCU Program, Seoul National University, Seoul 151-742, Republic of Korea
2Center for Interdisciplinary Research, Tohoku University, Sendai 980-8578, Japan
3Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea
4Faculty of Applied Chemical Engineering, Chonnam National University, Kwangju 500-757, Republic of Korea

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(Received 6 July 2010; accepted 25 September 2010; published online 25 October 2010)

The photoluminescence and stimulated emission characteristics of two types of periodically polarity-inverted ZnO grating structures have been investigated in detail. Strong photoluminescence in the step regions is observed for all the samples. However, electron-hole plasma emission is observed only for one type of sample consisting of Zn-polar ZnO/CrN and O-polar ZnO/Cr2O3 layers. Moreover, strong stimulated emission occurs only in the Zn-polar layers. These optical phenomena have been discussed in terms of the diffusion of excitons and local crystal quality.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

chromium compounds, diffraction gratings, excitons, II-VI semiconductors, optical films, optical materials, periodic structures, photoluminescence, semiconductor thin films, solid-state plasma, stimulated emission, wide band gap semiconductors, zinc compounds

PACS

  • 78.66.-w

    Optical properties of specific thin films

  • 78.55.-m

    Photoluminescence, properties and materials

  • 78.45.+h

    Stimulated emission

  • 73.20.Mf

    Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

  • 42.79.Dj

    Gratings

  • 42.70.Nq

    Other nonlinear optical materials; photorefractive and semiconductor materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3503605

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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