npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Physics: Sae Mulli 2017; 67: 896-901

Published online July 31, 2017 https://doi.org/10.3938/NPSM.67.896

Copyright © New Physics: Sae Mulli.

Formation of Self-Organized Nanostructures on ZnO and GaN Surfaces by Using Scanning Femtosecond Laser Pulses

Dae-Jin KIM1, Ki-Soo LIM*1, Ik-Bu SOHN2

1 Department of Physics, Chungbuk National University, Cheongju 28644, Korea
2 Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 61005, Korea

Correspondence to:kslim@chungbuk.ac.kr

Received: April 22, 2017; Revised: June 10, 2017; Accepted: June 12, 2017

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We report self-organized nanogratings formed on the surfaces of ZnO and GaN crystals by scanning a focused femtosecond laser beam at 800 nm with a repetition rate of 1 kHz. The period of the grating structure was about 600 nm on the GaN surface and about 200 nm on the ZnO surface and increased with increasing scan speed and laser pulse energy. The grating was oriented perpendicular to the direction of the linear laser's polarization. The nanogratings on the GaN surface showed metal-like characteristics due to the high plasma density while those on the ZnO surface showed dielectric-like characteristics. This could be due to the electron densities for the two surfaces being very different as a result of differences in their multiphoton absorption coefficients and internal defects, even though their band gaps were almost the same. 

Keywords: GaN, ZnO, Femtosecond laser, Nanograting, Surface plasmon polariton

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