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30 September 2005 Surface-plasmon modes in nano-holes in metals
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The goals of nanophotonics are to confine light to the nanoscale and to increase the local field intensity. Subwavelength confinement is of interest for nanolithography, photonic integrated circuits, subwavelength imaging and nano-sensors, whereas increased local field intensity is of interest for spectroscopy and nonlinear optics. Nanostructured metals allow us to achieve both of these goals by confining and focusing light below the normal diffraction limit, with the help of surface plasmons. Consequently, the understanding of how surface plasmons behave in nanoholes is important to the field of nanophotonics. In this paper we consider two different hole shapes: the rectangle and the double hole. We show that decreasing the short edge in a rectangular hole increases the wavelength of light that can propagate in the hole. We show that for a 15 nm hole in a real metal, the cut-off wavelength is more than doubled. Next we consider the double hole configuration, where the holes overlap to produce two apexes. We show that the local field in the nanometric vicinity of the apexes is 5 orders of magnitude larger than the field elsewhere. We calculate the optimum centre-to-centre spacing for the double-holes to maximize the cut-off wavelength and we calculate the dispersion of the light propagation near that wavelength.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. Gordon "Surface-plasmon modes in nano-holes in metals", Proc. SPIE 5971, Photonic Applications in Nonlinear Optics, Nanophotonics, and Microwave Photonics, 597110 (30 September 2005);


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