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RISS 인기검색어
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- 저자 : Gramotnev, Dmitri. K. (검색결과 2 건)
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Plasmon nanofocusing in a dielectric hemisphere covered in tapered metal film.
Mason, Daniel R,Gramotnev, Dmitri K,Kim, Kwang S Optical Society of America 2012 Optics express Vol.20 No.12
<P>We propose and analyze a new type of mechanically robust optical nanofocusing probe with minimized external environmental interference. The probe consists of a dielectric optical fiber terminated by a dielectric hemisphere - both covered in thin gold film whose thickness is reduced (tapered) along the surface of the hemisphere toward its tip. Thus the proposed probe combines the advantages of the diffraction-limited focusing due to annular propagation of the plasmon with its nanofocusing by a tapered metal wedge (i.e. a metal film with reducing local thickness). The numerical finite-element analysis demonstrates strongly subwavelength resolution of the described structure with the achievable size of the focal spot of ~20 nm with up to ~150 times enhancement of the local electric field intensity. Detailed physical interpretations of the obtained results are presented and possible application as a new type of SNOM probe for subwavelength imaging, spectroscopy and sensing are also discussed.</P>
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Wavelength-dependent transmission through sharp 90° bends in sub-wavelength metallic slot waveguides
Mason, Daniel R.,Gramotnev, Dmitri. K.,Kim, Kwang S. The Optical Society 2010 Optics express Vol.18 No.15
<P>In this paper, we present a comprehensive numerical study of the wavelength-dependence of transmission through sharp 90 degrees bends in metallic slot waveguides with sub-wavelength localization and varying geometrical parameters. In particular, it is demonstrated that increasing the plasmon wavelength results in a significant increase (up to nearly 100%) of transmission through the bend, combined with a reduction in the mode asymmetry in the second arm of the bend. The mode asymmetry and its relaxation are explained by interference of the transmitted mode with non-propagating and leaky modes generated at the bend. Comparison with the two-dimensional case of a metal-dielectric-metal waveguide is also conducted, showing significant differences for the slot waveguides based on the presence of different non-propagating and leaky modes.</P>
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