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Crystal polarity control of ZnO films and nonlinear optical response

Published online by Cambridge University Press:  31 January 2011

Jin Sub Park ,
Yoshiki Yamazaki ,
Yoshihiro Takahshi ,
Tsutomu Minegishi ,
Seunghwan Park ,
Soonku Hong ,
Ji-Ho Chang ,
Takumi Fujiwara  and
Takafumi Yao
Jin Sub Park
Affiliation:
jinsubpark@berkeley.edujinsubpark37@gmail.com, Center for Interdisciplinary Research, Tohoku university, Sendai, Japan
Yoshiki Yamazaki
Affiliation:
yayo@laser.apph.tohoku.ac.jp, Tohoku university, Applied physics, Sendai, Japan
Yoshihiro Takahshi
Affiliation:
takahashi@laser.apph.tohoku.ac.jp, Tohoku university, Applied physics, Sendai, Japan
Tsutomu Minegishi
Affiliation:
tmine@imr.tohoku.ac.jp, Center for Interdisciplinary Research, Tohoku university, Sendai, Japan
Seunghwan Park
Affiliation:
shpark@imr.tohoku.ac.jp, Center for Interdisciplinary Research, Tohoku university, Sendai, Japan
Soonku Hong
Affiliation:
soonku@cnu.ac.kr, Chungnam national university, Deajeon, Korea, Republic of
Ji-Ho Chang
Affiliation:
jiho_chang@hhu.ac.kr, Korea Maritime University, Department of Nano Semiconductor, Busan, Korea, Republic of
Takumi Fujiwara
Affiliation:
fujiwara@laser.apph.tohoku.ac.jp, Tohoku university, Applied physics, Sendai, Japan
Takafumi Yao
Affiliation:
tyao@cir.tohoku.ac.jp, Center for Interdisciplinary Research, Tohoku university, Sendai, Japan
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Abstract

We report that the nonlinear optical response of polarity controlled ZnO films grown by selective growth technique of Zn-polar and O-polar ZnO layers on sapphire substrate using Cr-compound buffer layers. ZnO layers grown on CrN/sapphire show Zn polar, while those grown on Cr2O3/sapphire result in O-polar ZnO films. In order to verify the origin of nonlinear optical response of ZnO, the polarity-controlled ZnO thin films grown on different buffer layers were investigated as nonlinear optical materials for second harmonic generation (SHG). The effective nonlinear optical coefficient (deff) of ZnO grown on Cr-compound buffer layers showed a higher value than that of ZnO grown on MgO buffer layers. Finally, by combining suggested in-situ polarity control technique with photolithography technique, we have fabricated 1D and 2D periodically-polarity-inverted (PPI) hetro-structures with periodicity ranging from 60 μm to 2 μm. The lateral polarity inversion is confirmed by piezo response microscopy. Such PPI ZnO heterostructures show the enhancement of SHG intensity comparing with the ZnO films.

Keywords

oxidethin filmII-VI
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1201: Symposium H – Zinc Oxide and Related Materials-2009 , 2009 , 1201-H06-07
Copyright
Copyright © Materials Research Society 2010

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