期刊
OPTICS COMMUNICATIONS
卷 253, 期 1-3, 页码 118-124出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2005.04.076
关键词
surface plasmon polariton; waveguide; optical fiber
类别
We theoretically study the transfer of energy from a fiber mode to surface plasmon polaritons at the silver/air interface in the taper region of a silver-coated fiber tip. We describe conditions, under which a transfer efficiency from the fiber mode to the surface plasmon polariton of up to 46% can be achieved. Propagation of the surface plasmon polaritons towards the tip of the tapered structure leads to a strong subwavelength localization of the excitation enabled by a substantial increase of the surface plasmon polariton wave vector approaching the tip. The resulting strong field enhancement and confinement has a tremendous potential for applications in ultrahigh resolution tip-enhanced near-field optical microscopy. (c) 2005 Elsevier B.V. All rights reserved.
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