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Published September 2006 | public
Journal Article

Highly Confined Photon Transport in Subwavelength Metallic Slot Waveguides


We report experimental realization of subwavelength slot waveguides that exhibit both micrometer-range propagation and high spatial confinement of light. Attention is given to rectangular waveguides with a Si_3N_4 core and Ag cladding; core thicknesses of 50−100 nm and widths of 250 nm − 10 μm are explored. Propagation lengths of ∼5λ are achieved with light confined to lateral and transverse dimensions of ∼λ/5 and ∼λ/2, respectively. This unique combination of light localization and propagation is achieved via interacting surface plasmons, which produce short modal wavelengths and strong field confinement at each metal/dielectric interface.

Additional Information

© 2006 American Chemical Society. Received 9 May 2006. Published online 27 July 2006. Published in print 1 September 2006. Discussions and technical assistance from N.Vu, A. Scherer, G. Derose, A. Neidholdt, L. Sweatlock, and D. Pacifici are gratefully acknowledged. This work was supported by the Air Force Office of Scientific Research via MURI grant FA9550-04-1-0434. J.A.D. acknowledges support from an NDSEG fellowship administered by the Army Research Office.

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October 26, 2023