Ridge waveguide as a near-field optical source

Itagi, A. V.; Stancil, D. D.; Bain, J. A.; Schlesinger, T. E.
December 2003
Applied Physics Letters;12/1/2003, Vol. 83 Issue 22, p4474
Academic Journal
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. © 2003 American Institute of Physics.


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