OPTICAL COMPUTING SYSTEMS, MATERIALS, AND DEVICES

Effect of conductivity and dielectric constant on the modulation voltage for optoelectronic devices based on nonlinear optical polymers

[+] Author Affiliations
James G. Grote, John S. Zetts, Robert L. Nelson, Frank K. Hopkins

United States Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/MLPS; 3005 P St., Ste. 6, Wright-Patterson Air Force Base, Ohio?45433-7707 E-mail: james.grote@afrl.af.mil

Larry R. Dalton

University of Southern California, Department of Chemistry, Locker Hydrocarbon Research Institute, Los Angeles, California?90089-1661

and University of Washington, Department of Chemistry, Seattle, Washington?98195-1700

Cheng Zhang

University of Southern California, Department of Chemistry, Locker Hydrocarbon Research Institute, Los Angeles, California?90089-1661

William H. Steier

University of Southern California, Department of Electrical Engineering, Center for Photonic Technology, Los Angeles, California?90089-0483

Opt. Eng. 40(11), 2464-2473 (Nov 01, 2001). doi:10.1117/1.1412227
History: Received Sep. 13, 2000; Revised May 31, 2001; Accepted June 6, 2001
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Presented is the effect of using various cladding materials with different conductivities and dielectric constants on the applied voltage for optoelectronic (OE) devices based on nonlinear optical (NLO) polymers. Using a conductive polymer, we have demonstrated a 3 to 13 times increase in the effective electro-optic (EO) coefficient of electrode-poled NLO polymers, compared to using passive polymer claddings. We have achieved the lowest poling voltage to date for maximum EO coefficient, 300 V, for a two-layer waveguide structure consisting of a 2-μm-thick NLO polymer layer and a 2-μm-thick conductive cladding layer. The dielectric constants of both the NLO polymer core and passive polymer cladding materials used for conventional polymer-based integrated optic devices are typically very similar in magnitude. This suggests that only a small fraction of the applied modulation voltage is reaching the NLO polymer core layer, requiring 4 to 5 times higher modulation voltage than the desired Vπ. We have demonstrated a factor-of-2 decrease in the modulation voltage using the same conductive polymer, due to its possessing a much higher dielectric constant than the core material at the modulation frequency tested. The results show promise for shorter, lower-operating-voltage devices. © 2001 Society of Photo-Optical Instrumentation Engineers.

© 2001 Society of Photo-Optical Instrumentation Engineers

Citation

James G. Grote ; John S. Zetts ; Robert L. Nelson ; Frank K. Hopkins ; Larry R. Dalton, et al.
"Effect of conductivity and dielectric constant on the modulation voltage for optoelectronic devices based on nonlinear optical polymers", Opt. Eng. 40(11), 2464-2473 (Nov 01, 2001). ; http://dx.doi.org/10.1117/1.1412227


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