2 September 2009 Nanoscale bowtie aperture as high efficiency light coupler with plasmonic waveguide
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Abstract
Efficiently coupling far field light into a nano structure is a challenge. This limits the utility of many of the nanophotonics devices that have been developed recently, such as waveguides carrying surface plasmon polariton modes with subwavelength confinement and long propagation length. End fire coupling is an option but requires careful alignment and may not be suitable for exciting densely packed arrays of waveguides. This paper investigates the use of a nanoscale bowtie aperture as an antenna for directly coupling far field light into a nanoscale plasmonic waveguide. The paper shows that when the aperture is designed to be resonant the coupling coefficient can be as high as 600% relevant to the energy incident on the open area of the aperture.
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Edward C. Kinzel, Edward C. Kinzel, Xianfan Xu, Xianfan Xu, } "Nanoscale bowtie aperture as high efficiency light coupler with plasmonic waveguide", Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 73942Y (2 September 2009); doi: 10.1117/12.829348; https://doi.org/10.1117/12.829348
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