We theoretically investigate the comparative study of coupling characteristics of lateral directional couplers and vertical directional couplers utilizing long-range surface plasmon polaritons (LRSPPs). In particular, the effect of metal stripe thickness, width, the separation between the stripes, and the wavelength of operation, on the characteristics of both types of coupler has been studied in detail. An optimum value of the metal stripe thickness has been observed to obtain the minimum coupling length in both cases. The study should be helpful in designing an efficient directional coupler utilizing LRSPPs.
© 2010 Optical Society of America
Optics at Surfaces
Original Manuscript: January 21, 2010
Revised Manuscript: March 10, 2010
Manuscript Accepted: March 19, 2010
Published: April 20, 2010
Triranjita Srivastava and Arun Kumar, "Comparative study of directional couplers utilizing long-range surface plasmon polaritons," Appl. Opt. 49, 2397-2402 (2010)