Lasing Characteristics of an Optically-Pumped Single ZnO Nanocrystal and Nanomachining for Controlling Oscillation Wavelength

  • K. Okazaki
  • T. Shimogaki
  • I. A. Palani
  • M. Higashihata
  • D. Nakamura
  • T. Okada
Part of the Springer Series in Materials Science book series (SSMATERIALS, volume 180)


Lasing characteristics from a single ZnO nanocrystal excited by third harmonic of a Q-switched Nd:YAG laser beam (355 nm, 5 ns) were investigated for the application to ultraviolet (UV) laser diode (LD) by using ZnO nanocrystals as building blocks. Those ZnO nanocrystals were synthesized on a silicon substrate with a catalyst of gold by a carbothermal chemical vapor deposition (CVD) method. ZnO nanowires and ZnO nanosheets were synthesized by changing the synthesis conditions and the dependence of lasing characteristics on the different forms were investigated. The emission spectra observed from a single ZnO nanowire and ZnO nanosheet showed the obvious lasing characteristics having mode structure and a threshold for lasing on the input–output characteristics. The threshold power density of a ZnO nanowire and a ZnO nanosheet was measured to be about 150 and 50 kW/cm2, respectively. Then, the oscillation mechanisms were discussed on those ZnO nanocrystals, and it was concluded that each lasing mechanism was attributed to the microcavity effect due to the strong UV light confinement caused by the high refractive index of ZnO (≈2.4) for UV light. ZnO can be a superior UV laser medium and an UV nano-laser source also can be expected. However, the observed lasing spectra from both ZnO nanocrystals had mode structure, and a single longitudinal mode lasing would be required for the stabilization of the output power and the prevention of light dispersion. Therefore, we considered the possibilities of the single longitudinal mode lasing from a single ZnO nanowire using distributed Bragg reflector lasing machined by focused ion beam with Ga ions focused up to 7 nm and a single ZnO nanosheet using subwavelength machining by Fresnel diffraction for 2D photonic crystal. We also observed the laser-induced motions (LIM) of ZnO nanocrystals dispersed on a substrate in the air when they were excited by the UV laser beam at high excitation power over several MW/cm2 which could be attributed to the electromotive force due to piezo effects of ZnO nanocrystals, and a simple alignment method of ZnO nanocrystals was considered by the use of the LIM and voltage-applied electrodes on a substrate.


Distribute Bragg Reflector Single Longitudinal Mode Fresnel Diffraction Excitation Power Density Silica Glass Substrate 
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The authors would like to thank Dr. T. Daio in the research laboratory for high voltage electron microscopy in Kyushu University, for his assistance in the experiments. A part of this work was supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS, No. 20360142) and Special Coordination Funds for Promoting Science and Technology from Japan Science and Technology Agency is also acknowledged.


  1. 1.
    T. Okada, K. Kawashima, Y. Nakata, X. NING, Synthesis of ZnO nanorods by laser ablation of ZnO and Zn targets in He and O2 background gas. Jpn. J. Appl. Phys. 44, 688 (2005)ADSCrossRefGoogle Scholar
  2. 2.
    R.Q. Guo, J. Nishimura, M. Ueda, M. Higashihata, D. Nakamura, T. Okada, Vertically aligned growth of ZnO nanonails by nanoparticle-assisted pulsed-laser ablation deposition. Appl. Phys. A 89, 141 (2007)ADSCrossRefGoogle Scholar
  3. 3.
    R.Q. Guo, J. Nishimura, M. Matsumoto, D. Nakamura, T. Okada, Catalyst-free synthesis of vertically-aligned ZnO nanowires by nanoparticle-assisted pulsed laser deposition. Appl. Phys. A 93, 843 (2008)ADSCrossRefGoogle Scholar
  4. 4.
    R.Q. Guo, J. Nishimura, M. Matsumoto, M. Higashihata, D. Nakamura, T. Okada, Density-controlled growth of ZnO nanowires via nanoparticle-assisted pulsed-laser deposition and their optical properties. Jpn. J. Appl. Phys. 47, 741 (2008)ADSCrossRefGoogle Scholar
  5. 5.
    R.Q. Guo, M. Matsumoto, T. Matsumoto, M. Higashihata, D. Nakamura, T. Okada, Aligned growth of ZnO nanowires by NAPLD and their optical characterizations. Appl. Surf. Sci. 255, 9671 (2009)ADSCrossRefGoogle Scholar
  6. 6.
    Y.C. Kong, D.P. Yu, B. Zhang, W. Fang, S.Q. Feng, Ultraviolet-emitting ZnO nanowires synthesized by a physical vapor deposition approach. Appl. Phys. Lett. 78, 407 (2001)ADSCrossRefGoogle Scholar
  7. 7.
    J.J. Wu, S.C. Liu, Low-temperature growth of well-aligned ZnO nanorods by chemical vapor deposition. Adv. Mater. 14, 215 (2002)CrossRefGoogle Scholar
  8. 8.
    Y.W. Heo, V. Varadarajan, M. Kaufman, K. Kim, D.P. Norton, F. Ren, P.H. Fleming, Site-specific growth of Zno nanorods using catalysis-driven molecular beam epitaxy. Appl. Phys. Lett. 81, 3046 (2002)ADSCrossRefGoogle Scholar
  9. 9.
    J.H. Park, J.G. Park, Synthesis of ultrawide ZnO nanosheets. Curr. Appl. Phys. 6, 1020–1023 (2006)ADSCrossRefGoogle Scholar
  10. 10.
    L. Xu, Y. Guo, Q. Liao, J. Zhang, D. Xu, Morphological control of ZnO nanostructures by electrodeposition. J. Phys. Chem. B 109, 13519–13522 (2005)Google Scholar
  11. 11.
    F. Wang, R. Liu, A. Pan, L. Cao, K. Cheng, B. Xue, G. Wang, Q. Meng, J. Li, Q. Li, Y. Wang, T. Wang, B. Zou, The optical properties of ZnO sheets electrodeposited on ITO glass. Mater. Lett. 61, 2000–2003 (2007)CrossRefGoogle Scholar
  12. 12.
    E.S. Jang, X. Chen, J.H. Won, J.H. Chung, D.J. Jang, Y.W. Kim, J.H. Choy, Soft-solution route to ZnO nanowall array with low threshold power density. Appl. Phys. Lett. 97, 043109 (2010)ADSCrossRefGoogle Scholar
  13. 13.
    M.H. Huang, S. Mao, H. Feick, H. Yan, Y. Wu, H. Kind, E. Weber, R. Russo, P. Yang, Room-temperature ultraviolet nanowire nanolasers. Science 292, 1897–1899 (2001)ADSCrossRefGoogle Scholar
  14. 14.
    L.K. Vugt, S. Rhle, D. Vanmaekelbergh, Phase-correlated nondirectional laser emission from the end facets of a ZnO nanowire. Nano Lett. 6, 2707–2711 (2006)ADSCrossRefGoogle Scholar
  15. 15.
    M.A. Zimmler, F. Capasso, S. Muller, C. Ronning, Optically pumped nanowire lasers: invited review. Semicond. Sci. Technol. 25, 024001 (2010)ADSCrossRefGoogle Scholar
  16. 16.
    S.F. Yu, C. Yuen, S.P. Lau, Random laser action in ZnO nanorod arrays embedded in ZnO epilayers. Appl. Phys. Lett. 84, 3241–3243 (2004)ADSCrossRefGoogle Scholar
  17. 17.
    E.S.P. Leong, S.F. Yu, S.P. Lau, Directional edge-emitting UV random laser diodes. Appl. Phys. Lett. 89, 221109 (2006)ADSCrossRefGoogle Scholar
  18. 18.
    S. Chu, M. Olmedo, Z. Yang, J. Kong, J. Liu, Electrically pumped ultraviolet ZnO diode lasers on Si. Appl. Phys. Lett. 93, 181106 (2008)ADSCrossRefGoogle Scholar
  19. 19.
    S. Chu, G. Wang, W. Zhou, Y. Lin, L. Chernyak, J. Zhao, J. Kong, L. Li, J. Ren, J. Liu, Electrically pumped waveguide lasing from ZnO nanowires. Nat. nanotechnol. 6, 506–510 (2011)ADSCrossRefGoogle Scholar
  20. 20.
    J.C. Ryan, T.L. Reinecke, Band-gap renormalization of optically excited semiconductor quantum wells. Phys. Rev. B 47, 9615–9620 (1993)ADSCrossRefGoogle Scholar
  21. 21.
    A.E. Siegman, Lasers (University Science Books, Mill Valley, 1986)Google Scholar
  22. 22.
    S. Adachi, Optical Constants of Crystalline and Amorphous Semiconductors: Numerical Data and Graphical Information (Kluwer Academic Publishers, Boston, 1999), Chap. D2CrossRefGoogle Scholar
  23. 23.
    J. Zhoua, Z. Wang, A. Grots, X. He, Electric field drives the nonlinear resonance of a piezoelectric nanowire. Sol. State Comm. 144, 118 (2007)ADSCrossRefGoogle Scholar

Copyright information

© Springer India 2014

Authors and Affiliations

  • K. Okazaki
    • 1
  • T. Shimogaki
    • 1
  • I. A. Palani
    • 1
  • M. Higashihata
    • 1
  • D. Nakamura
    • 1
  • T. Okada
    • 1
  1. 1.Graduate School of Information Science and Electrical EngineeringKyushu UniversityFukuokaJapan

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