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Study of the Effects of MeV Ag, Cu, Au and Sn Implantation on the Optical Properties of LiNbO3

Published online by Cambridge University Press:  10 February 2011

E. K. Williams ,
D. Ila ,
S. Sarkisov ,
M. Curley ,
D. B. Poker ,
D. K. Hensley  and
C. Borel
E. K. Williams
Affiliation:
Dept. of Natural and Physical Sciences, PO Box 1447, Normal, AL 35762-1447
D. Ila
Affiliation:
Dept. of Natural and Physical Sciences, PO Box 1447, Normal, AL 35762-1447
S. Sarkisov
Affiliation:
Dept. of Natural and Physical Sciences, PO Box 1447, Normal, AL 35762-1447
M. Curley
Affiliation:
Dept. of Natural and Physical Sciences, PO Box 1447, Normal, AL 35762-1447
D. B. Poker
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
D. K. Hensley
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
C. Borel
Affiliation:
Université Claude Bernard, Lyon, France.
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Abstract

We present the results of characterization of linear absorption and nonlinear refractive index of Au, Ag, Cu and Sn ion implantation into LiNbO3. Silver was implanted at 1.5 MeV to fluences of 2 to 17 × 1016/cm2 at room temperature. Gold and copper were implanted to fluences of 5 to 20 × 1016/cm2 at an energy of 2.0 MeV. Tin was implanted to a fluence of 1.6 × 1017/cm2 at 160 kV. After heat treatment at 1000°C a strong optical absorption peak for the Au implanted samples appeared at ∼620 nm. The absorption peaks of the Ag implanted samples shifted from ∼450 nm before heat treatment to 550 nm after 500°C for lh. Heat treatment at 800°C returned the Ag implanted crystals to a clear state. Cu nanocluster absorption peaks disappears at 500°C. No Sn clusters were observed by optical absorption or XRD. The size of the Ag and Au clusters as a function of heat treatment were determined from the absorption peaks. The Ag clusters did not appreciably change in size with heat treatment. The Au clusters increased from 3 to 9 nm in diameter upon heat treatment at 1000°C. TEM analysis performed on a Au implanted crystal indicated the formation of Au nanocrystals with facets normal to the c-axis. Measurements of the nonlinear refractive indices made using the Z-scan method showed that Ag implantation changed the sign of the nonlinear index of LiNbO3 from negative to positive.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 504: Symposium KK – Atomistic Mechanisms in Beam Synthesis & Irradiation… , 1997 , 363
Copyright
Copyright © Materials Research Society 1998

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