Near-field beam focusing by a single bare subwavelength metal slit with the high-index transmission space | Zendy

Yan Guo | Zendy; Bo Zhao | Zendy; Jianjun Yang | Zendy

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Near-field beam focusing by a single bare subwavelength metal slit with the high-index transmission space

Author(s) -

Yan Guo,

Bo Zhao,

Jianjun Yang

Publication year - 2013

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.21.013949

Subject(s) - optics , slit , physics , refractive index , transmission (telecommunications) , extraordinary optical transmission , interference (communication) , beam (structure) , near and far field , near field optics , space (punctuation) , light beam , transmission coefficient , field (mathematics) , surface plasmon , plasmon , surface plasmon polariton , telecommunications , scanning electron microscope , channel (broadcasting) , mathematics , optical microscope , pure mathematics , linguistics , philosophy , computer science

We theoretically demonstrate that a single bare subwavelength metal slit without any surrounding corrugations can have a capability to steer the incident light into focusing patterns by introducing a high index in the transmission half-space. The focusing properties are identified to depend on both the slit width and the output permittivity. The underlying physics lies in the interference of quasi-cylindrical waves scattered from the slit, and our proposed model agrees well with the simulation results. This finding is believed to inspire some novel ideas for the nano-optics design.

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