A subwavelength plasmonic waveguide composed of a pair of comb-shape nanorod chains is proposed. The electromagnetic energy can be transported in the waveguide via the interaction strength of magnetoinductive coupling as well as conduction current exchange. Finite Element Method simulation results reveal that for such a waveguide composed of 50 pairs of 400 nm-long-nanorods, a passband ranging from zero to cutoff frequency 156.2 THz, and an effective propagation length of 20.87 μm can be achieved simultaneously. The proposed mechanism of energy transport in the nanoscale has potential applications in subwavelength transmission lines for a wide range of integrated optical devices.
© 2012 Optical Society of America
Original Manuscript: June 4, 2012
Revised Manuscript: July 10, 2012
Manuscript Accepted: August 10, 2012
Published: September 10, 2012
Bing Shen, Yongqing Huang, Xiaofeng Duan, Xiaomin Ren, Xia Zhang, Qi Wang, and Dong Zhang, "Energy transportation in a subwavelength waveguide composed of a pair of comb-shape nanorod chains," Appl. Opt. 51, 6376-6381 (2012)