18 June 2007 Frequency-domain simulations of optical antenna structures
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Optical antennas consisting of metallic parts are analyzed using the Multiple Multipole Program (MMP), a semi-analytic boundary discretization method. It is demonstrated that difficult numerical problems are caused because optical antennas exhibit strong material dispersion, loss, and plasmon-polariton effects that require a very fine discretization. In addition to standard dipole-type antennas, consisting of two pieces of metal, a new structure consisting of a single metal piece with a tiny groove in the center is analyzed. This structure takes advantage of the Channel Plasmon-Polariton (CPP) effect and exhibits a strong enhancement of the electric field in the groove. Furthermore, the groove type antenna exhibits two resonance peaks when its dimension is much smaller than the wavelength. It is demonstrated that the strengths and locations of the resonance peaks may be tuned within some range by tuning the length of the antenna.
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Christian Hafner, Christian Hafner, Xudong Cui, Xudong Cui, Andre Bertolace, Andre Bertolace, Rüdiger Vahldieck, Rüdiger Vahldieck, } "Frequency-domain simulations of optical antenna structures", Proc. SPIE 6617, Modeling Aspects in Optical Metrology, 66170E (18 June 2007); doi: 10.1117/12.725876; https://doi.org/10.1117/12.725876

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