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Electro-optic potassium-tantalate-niobate films prepared by pulsed laser deposition from segmented pellets

Published online by Cambridge University Press:  03 March 2011

S. Yilmaz ,
R. Gerhard-Multhaupt ,
W.A. Bonner ,
D.M. Hwang ,
A. Inam ,
J.A. Martinez ,
T.S. Ravi ,
T. Sands ,
B.J. Wilkens  and
X.D. Wu
...Show all authors
S. Yilmaz
Affiliation:
Bell Communications Research, Red Bank, New Jersey 07701-7020
R. Gerhard-Multhaupt
Affiliation:
Heinrich-Hertz-Institut für Nachrichtentechnik, Berlin GmbH, Einsteinufer 37, D-1000 Berlin 10, Germany
W.A. Bonner
Affiliation:
Bell Communications Research, Red Bank, New Jersey 07701-7020
D.M. Hwang
Affiliation:
Bell Communications Research, Red Bank, New Jersey 07701-7020
A. Inam
Affiliation:
Bell Communications Research, Red Bank, New Jersey 07701-7020
J.A. Martinez
Affiliation:
Bell Communications Research, Red Bank, New Jersey 07701-7020
T.S. Ravi
Affiliation:
Bell Communications Research, Red Bank, New Jersey 07701-7020
T. Sands
Affiliation:
Bell Communications Research, Red Bank, New Jersey 07701-7020
B.J. Wilkens
Affiliation:
Bell Communications Research, Red Bank, New Jersey 07701-7020
X.D. Wu
Affiliation:
Bell Communications Research, Red Bank, New Jersey 07701-7020
T. Venkatesan
Affiliation:
Bell Communications Research, Red Bank, New Jersey 07701-7020
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Abstract

Thin films of potassium tantalate niobate (KTN) were prepared by means of pulsed excimer-laser deposition and investigated with a number of analytical techniques, including electrical and electro-optical measurements. For applications in longitudinal electro-optic modulators, a transparent electrode is required between substrate and electro-optic layers. Suitable electrode materials, which at the same time permit epitaxial growth of KTN, were identified and prepared. The resulting layered samples were not only of good epitaxial and optical quality, but also exhibited the expected maximum of the longitudinal electro-optic effect at temperatures between the phase transitions from cubic to tetragonal and from tetragonal to orthorhombic. However, the maximum achievable electro-optic phase shift was found to be limited to roughly τ/100 for KTN films in the thickness range around 1 μm. Therefore, much thicker films are probably necessary for most practical applications, which requires significant improvements in the long-term stability and homogeneity of the deposition process.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 5 , May 1994 , pp. 1272 - 1279
Copyright
Copyright © Materials Research Society 1994

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