Open AccessChannel plasmon polaritons guided by graded gaps: closed-form solutions
Author(s) -
Sergey I. Bozhevolnyi,
Khachatur Nerkararyan
Publication year - 2009
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.010327
Subject(s) - surface plasmon polariton , surface plasmon , plasmon , optics , dispersion (optics) , refractive index , materials science , polariton , wavelength , channel (broadcasting) , localized surface plasmon , optoelectronics , physics , telecommunications , computer science
Using the effective-index approximation along with the explicit expression for the propagation constant of gap surface plasmons established recently [Opt. Express 16, 2676-2684 (2008)], we develop an analytic description of channel plasmon polariton (CPP) modes guided along V-grooves and gaps between two metal cylindrical surfaces. The results obtained for V-grooves are compared with those reported previously. Dispersion of the main CPP characteristics is calculated for air-gold configurations, allowing one to design graded-gap waveguides for the single-mode operation supporting well-confined fundamental CPP modes in a broad wavelength range.