We study the coupling mechanism between a high refractive index contrast waveguide and a plasmonic thin-film waveguide in the IR range. We also propose a novel design of a vertical coupler based on loading the plasmonic waveguide with a high refractive index contrast medium on each side. We achieve a coupling efficiency and an insertion loss of about 95% and 0.2 dB, respectively, with a coupling length of only 2.85 μm at the working wavelength of 1.55 μm.
© 2012 Optical Society of America
Optics at Surfaces
Original Manuscript: September 24, 2012
Revised Manuscript: November 19, 2012
Manuscript Accepted: December 4, 2012
Published: December 20, 2012
Giovanni Magno, Marco Grande, Vincenzo Petruzzelli, and Antonella D’Orazio, "Numerical analysis of the coupling mechanism in long-range plasmonic couplers at 1.55 μm," Opt. Lett. 38, 46-48 (2013)