Ridge waveguide as a near-field optical source

We investigate the feasibility of using a ridge waveguide at optical frequencies as a near-field optical transducer, using the finite difference time domain method. The complete electromagnetic field picture of the ridge waveguide, in the absence and presence of the irradiated medium, is presented....

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Bibliographic Details
Published in:Applied physics letters 2003-12, Vol.83 (22), p.4474-4476
Main Authors: Itagi, A. V., Stancil, D. D., Bain, J. A., Schlesinger, T. E.
Format: Article
Language:English
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Summary:We investigate the feasibility of using a ridge waveguide at optical frequencies as a near-field optical transducer, using the finite difference time domain method. The complete electromagnetic field picture of the ridge waveguide, in the absence and presence of the irradiated medium, is presented. A power efficiency of 7% and an optical spot with full width half maximum of 50 nm×80 nm is obtained in the medium. We show that impedance considerations play a major role in the transducer-medium optical coupling.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1631057