We introduce a plasmonic waveguide system, which supports a subwavelength broadband slow-light guided mode with a tunable slowdown factor at a given wavelength. The system consists of a metal–dielectric–metal (MDM) waveguide side-coupled to a periodic array of MDM stub resonators. The slowdown factor at a given wavelength can be tuned by adjusting the geometrical parameters of the system. In addition, there is a trade-off between the slowdown factor and the propagation length of the supported optical mode. Finally, we show that light can be coupled efficiently from a conventional MDM waveguide to the plasmonic waveguide system.
© 2010 Optical Society of America
Optics at Surfaces
Original Manuscript: August 23, 2010
Manuscript Accepted: November 13, 2010
Published: December 14, 2010
Liu Yang, Changjun Min, and Georgios Veronis, "Guided subwavelength slow-light mode supported by a plasmonic waveguide system," Opt. Lett. 35, 4184-4186 (2010)