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Enlarging the Bandwidth of Nano-scale Propagating Plasmonic Modes in Deep-subwavelength Cylindrical Holes

Published online by Cambridge University Press:  01 February 2011

Peter B. Catrysse
Affiliation:, Stanford University, Electrical Engineering, E. L. Ginzton Laboratory, Box N-126, 450 Via Palou, Stanford, CA, 94301-4088, United States
Shanhui Fan
Affiliation:, Stanford University, Stanford, CA, 94305-4088, United States
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Subwavelength cylindrical holes in optically thick metallic films always support a propagating HE11 mode near the surface plasmon frequency, regardless of how small the holes are. For holes filled with a uniform dielectric material, the bandwidth of the HE11 mode asymptotically approaches zero as the hole size is reduced to deep-subwavelength scales. We show that it is possible to create nano-scale propagating plasmonic modes with very large bandwidth in holes that are concentrically filled with two different dielectric materials, even when the hole radius goes to zero.

Research Article
Copyright © Materials Research Society 2008

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