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Proceedings Paper

Growth and characterization of single-crystal organic thin films for electro-optic modulators
Author(s): Alexander Leyderman; Yulong Cui; Javier Wu Li; Sergey S. Sarkisov; Michael J. Curley; Curtis E. Banks; Benjamin G. Penn
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Paper Abstract

Organic materials with large electro-optic coefficients are promising for fabrication of fast electro-optic modulators with low driving voltage. In this paper we describe the growth of micron-thick single crystal films of various electro-optic organic materials from melt using the plate- guided method. The compounds such as mNA, COANP, NPP, PNP, MBANP and DAST will be considered. The films are grown using a homemade facility, which allows to control melting and recrystallization rate and to observe the process with an optical polarizing microscope. A single crystal films will make up a planar optical waveguide integrated with a coupling prism. The light will be injected into the film using the prism. Then, after traveling a certain distance within the film, the light will be decoupled. Combination of high electro-optic coefficients of the film (10 to 100 pm/V) with relatively long travel distance of the light beam (5 mm and more) potentially gives a driving voltage of the phase modulation of the beam of 5 V and less. This is very important for the incorporation of the modulator into a standard low voltage electronic circuitry. The phase modulation can be converted into amplitude modulation using various interferometer schemes such as Mach-Zehnder (M-Z) scheme with external arm, M-Z with internal arm, polarimetric waveguide interferometer, and dual-mode single- arm interferometer. We will provide some experimental data showing the advantage of the dual-mode single-arm scheme. Potential modulation rate of the system can be 10 dB and higher.

Paper Details

Date Published: 28 June 1999
PDF: 10 pages
Proc. SPIE 3793, Operational Characteristics and Crystal Growth of Nonlinear Optical Materials, (28 June 1999); doi: 10.1117/12.351425
Show Author Affiliations
Alexander Leyderman, Univ. of Puerto Rico/Mayaguez (United States)
Yulong Cui, Univ. of Puerto Rico/Mayaguez (United States)
Javier Wu Li, Univ. of Puerto Rico/Mayaguez (United States)
Sergey S. Sarkisov, Alabama A&M Univ. (United States)
Michael J. Curley, Alabama A&M Univ. (United States)
Curtis E. Banks, NASA Marshall Space Flight Ctr. (United States)
Benjamin G. Penn, NASA Marshall Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 3793:
Operational Characteristics and Crystal Growth of Nonlinear Optical Materials
Ravindra B. Lal; Donald O. Frazier, Editor(s)

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