A simple method to obtain the coupling characteristics of a directional coupler consisting of two dielectric-loaded surface plasmon polariton waveguides is reported. The method is found to give accurate results in comparison with the widely used effective index method. Theoretical results are also found to match excellently with recently reported measurements on coupling lengths in such waveguides [ Opt. Lett. 34, 310 (2009)].
© 2009 Optical Society of America
Original Manuscript: March 31, 2009
Revised Manuscript: July 7, 2009
Manuscript Accepted: July 10, 2009
Published: July 27, 2009
Triranjita Srivastava and Arun Kumar, "Coupling characteristics of dielectric-loaded surface plasmon polariton waveguides: a simple method of analysis," Appl. Opt. 48, G44-G47 (2009)