Superfocusing of electric or magnetic fields using conical metal tips: effect of mode symmetry on the plasmon excitation method | Zendy

Jae Sung Lee | Zendy; Sanghoon Han | Zendy; J. Shirdel | Zendy; Sukmo Koo | Zendy; Diyar Sadiq | Zendy; Christoph Lienau | Zendy; Namkyoo Park | Zendy

Open Access

Superfocusing of electric or magnetic fields using conical metal tips: effect of mode symmetry on the plasmon excitation method

Author(s) -

Jae Sung Lee,

Sanghoon Han,

J. Shirdel,

Sukmo Koo,

Diyar Sadiq,

Christoph Lienau,

Namkyoo Park

Publication year - 2011

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.19.012342

Subject(s) - near field scanning optical microscope , excitation , conical surface , optics , surface plasmon polariton , surface plasmon , plasmon , electric field , materials science , magnetic field , physics , optical microscope , scanning electron microscope , quantum mechanics , composite material

We compare single- and double-sided excitation methods of adiabatic surface plasmon polariton (SPP) wave superfocusing for scattering-type metallic near-field scanning optical microscopy (s-NSOM). Using the results of full 3D finite difference time domain analyses, the differences in field enhancement factors are explained and reveal the mode selectivity of a conical NSOM tip for adiabatic SPP superfocusing. Exploiting the mode-symmetric nature of the tip further, we also show that it is possible to selectively confine either the electric or magnetic field at the NSOM tip apex, by simply adjusting the relative phase between the SPP waves in the double-sided excitation approach.

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