Guiding and Nanofocusing of Two-Dimensional Optical Beam for Nanooptical Integrated Circuits

Junichi TAKAHARA   Fuminori KUSUNOKI   

Publication
IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.1   pp.87-94
Publication Date: 2007/01/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Microoptomechatronics)
Category: INVITED
Keyword: 
nanophotonics ,  plasmonics ,  surface plasmon polariton ,  two-dimensional optical wave ,  negative dielectric ,  

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Summary: 
Guiding and nanofocusing of a two-dimensional (2D) optical beam in a negative-dielectric-gap waveguide is studied theoretically. An index-guiding method along the dielectric core embedded in the negative-dielectric-gap is proposed and the confinement properties of the 2D optical beam are studied by the effective-refractive-index method and FDTD simulations. We have shown that the lateral beam width of the 2D optical beam can be shrunk to zero beyond the diffraction limit. A tapered negative-dielectric-gap waveguide using adiabatic propagation achieves nano-focusing and can be applied to nano-optical couplers. This is a gateway from conventional dielectric waveguides to nano-optical integrated circuits.