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Published November 8, 2011 | Published + Supplemental Material
Journal Article Open

Plasmonic Rainbow Trapping Structures for Light Localization and Spectrum Splitting


"Rainbow trapping" has been proposed as a scheme for localized storage of broadband electromagnetic radiation in metamaterials and plasmonic heterostructures. Here, we articulate the dispersion and power flow characteristics of rainbow trapping structures, and show that tapered waveguide structures composed of dielectric core and metal cladding are best suited for light trapping. A metal-insulator-metal taper acts as a cascade of optical cavities with different resonant frequencies, exhibiting a large quality factor and small effective volume comparable to conventional plasmonic resonators.

Additional Information

© 2011 American Physical Society. Received 12 April 2011; published 8 November 2011. We thank Stanley Burgos and Eyal Feigenbaum for helpful comments. This work was supported by the Light-Material Interactions in Energy Conversion Center, an Energy Frontier Research Center of the Office of Science of the Department of Energy under Grant No. DE-SC0001293.

Attached Files

Published - Jang2011p16447Phys_Rev_Lett.pdf

Supplemental Material - 20111028supplemental.docx

Supplemental Material - 20111028supplemental.pdf


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