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Title
Japanese: 
English:Resonant exciton second-harmonic generation in self-assembled ZnO microcrystallite thin films 
Author
Japanese: 張希清, 湯 子康, 川崎 雅司, 大友 明, 鯉沼 秀臣.  
English: Xiqing Zhang, Z. K. Tang, M. Kawasaki, A. Ohtomo, H. Koinuma.  
Language English 
Journal/Book name
Japanese: 
English:Journal of Physics-Condensed Matter 
Volume, Number, Page Vol. 15    No. 30    pp. 5191-5196
Published date Aug. 2003 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL <Go to ISI>://000185156200005
 
DOI https://doi.org/10.1088/0953-8984/15/30/301
Abstract Second-harmonic generation has been studied for fundamental wavelengths from 720 to 1100 nm on high-quality ZnO thin films deposited on sapphire substrates by laser molecular beam epitaxy. The second-order nonlinear susceptibility components increase dramatically as the second-harmonic frequency approaches the ZnO bandgap. The increase is most likely due to a resonance of the second-harmonic frequency with the critical point transition associated with the direct bandgap transition. Large second-order nonlinear susceptibility components were determined to have a nonresonant background value of -83.7 pm V-1 for d(33), 14.7 pm V-1 for d(31) and 15.2 pm V-1 for d(15) for a fundamental wavelength of 1064 nm. The value of d(33) for the film was as high as 14 times that of bulk material in the nonresonant region. The difference in values between the second nonlinear coefficients of the bulk and the film may originate from the microcrystallite structure.

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