期刊
OPTICS EXPRESS
卷 19, 期 13, 页码 12342-12347出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.19.012342
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资金
- National Research Foundation (NRF) [K20815000003]
- Deutsche Forschungsgemeinschaft [SPP 1391]
- Korea Science and Engineering Foundation (KOSEF) [2010-0001859]
- Korea government (MEST)
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. (C) 2011 Optical Society of America
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