We investigate the excitation of surface plasmon polaritons on silver tubes with finite-difference time-domain simulations. These surface plasmon polaritons exhibit azimuthal whispering gallery modes with quality factors in the hundreds. We show that the high quality factors arise from the coupling of the surface plasmon modes to photonic modes inside the tube. We examine the influence of a gain material on the quality factors and find that for material data of rhodamine 6G, the quality factors are enhanced significantly up to values of 3000.
© 2011 Optical Society of America
Optics at Surfaces
Original Manuscript: January 10, 2011
Revised Manuscript: March 2, 2011
Manuscript Accepted: March 2, 2011
Published: March 30, 2011
Andreas Rottler, Markus Bröll, Stephan Schwaiger, Detlef Heitmann, and Stefan Mendach, "Tailoring of high-Q-factor surface plasmon modes on silver microtubes," Opt. Lett. 36, 1240-1242 (2011)