TITLE

Atomic-scale surface control and second-harmonic generation in Gd[sub x]Y[sub 1-x]Ca[sub 4]O(BO[sub 3])[sub 3] thin films grown by combinatorial laser molecular-beam epitaxy

AUTHOR(S)
Kim, T.-W.; Arai, N.; Koinuma, H.; Matsumoto, Y.; Yoshimura, M.; Furuya, H.; Nakao, H.; Mori, Y.; Sasaki, T.
PUB. DATE
September 2001
SOURCE
Applied Physics Letters;9/17/2001, Vol. 79 Issue 12, p1783
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We studied the atomic-scale growth control and second-harmonic generation (SHG) properties of Gd[sub x]Y[sub 1-x]Ca[sub 4]O(BO[sub 3])[sub 3] thin films. Combinatorial laser molecular-beam epitaxy was employed to optimize the growth conditions of the film. Ultrasmooth Gd[sub x]Y[sub 1-x]Ca[sub 4]O(BO[sub 3])[sub 3] thin films with step-and-terrace structure were obtained by using atomically controlled GdCa[sub 4]O(BO[sub 3])[sub 3] substrates. The dependence of SHG intensity on the fundamental wave polarization angle was studied for the epitaxial film on (010) GdCa[sub 4]O(BO[sub 3])[sub 3] substrate in comparison for the randomly oriented film on (0001) sapphire substrate. It was found that only the epitaxially grown film clearly exhibited a fourfold SHG intensity showing type-II phase-matching direction. © 2001 American Institute of Physics.
ACCESSION #
5145225

 

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