Open AccessExcitation of direction-tunable surface plasmon polaritons by using a rectangular array of silver nanodisks
Author(s) -
Shunyu Yao,
Zhiyou Guo,
HongBo Sun,
Hongyong Huang
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.020102
Subject(s) - surface plasmon polariton , optics , surface plasmon , materials science , ray , plasmon , localized surface plasmon , optoelectronics , polarization (electrochemistry) , wavelength , surface plasmon resonance , nanophotonics , excitation , physics , nanoparticle , nanotechnology , chemistry , quantum mechanics
Use of dipole-like localized surface plasmons (LSPs) induced on a rectangular array of silver nanodisks to excite directional surface plasmon polaritons (SPPs) on a flat silver film is demonstrated. By modifying the spectral resonance of the LSPs, an effective coupling of the incident light into the SPPs has been achieved at operational wavelength of λ 0 = 628 nm. The maximum SPP intensity exceeds 25% of the incident intensity. Meanwhile, owing to the angle-dependent spatial distribution of the LSPs and the constructive interference between columns or rows of the array, the excited SPPs are supported to propagate in two orthogonal channels with a width of 1756 nm. Moreover, the propagation of the SPPs is tunable by rotating the polarization direction of the incident light between angles of 0 and π/2. This approach of launching direction-tunable SPPs shows great potential in applications of integrated plasmonic circuits.