Using the effective-index approximation along with the explicit expression for the propagation constant of gap surface plasmons established recently [ Opt. Express 16, 2676 (2008) ], we derive closed-form expressions for channel plasmon polariton (CPP) modes supported by V grooves cut into metal. The CPP field distributions and mode characteristics are calculated for the air–gold configuration. The results obtained are found to be in good agreement with the results of previous numerical simulations.
© 2009 Optical Society of America
Original Manuscript: April 7, 2009
Revised Manuscript: May 22, 2009
Manuscript Accepted: May 22, 2009
Published: June 29, 2009
Sergey I. Bozhevolnyi and Khachatur V. Nerkararyan, "Analytic description of channel plasmon polaritons," Opt. Lett. 34, 2039-2041 (2009)