Open AccessHybridized plasmonic modes and Fabry-Perot effect in nanoscale bowtie aperture waveguide
Author(s) -
Liang Zhang,
Jin Qin,
Songpo Guo,
Liang Wang
Publication year - 2019
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.27.017221
Subject(s) - optics , surface plasmon polariton , plasmon , aperture (computer memory) , surface plasmon , plasmonic lens , extraordinary optical transmission , wavelength , diffraction , coupled mode theory , waveguide , hfss , physics , perfect conductor , optoelectronics , materials science , refractive index , telecommunications , antenna (radio) , microstrip antenna , computer science , acoustics , scattering
Based on Bethe's theory, light is hard to transmit through sub-wavelength apertures. However, a special designed sub-wavelength bowtie aperture is found to be able to transmit light with high efficiency. In this letter, modal analysis is used to study the hybridized plasmonic modes and Fabry-Perot effect of the nanoscale bowtie aperture waveguide. High frequency structure simulator (HFSS) simulations in perfect electrically conductor (PEC) and real metals are performed to calculate the fundamental mode, higher order mode, as well as their own cutoff wavelength. Mode analysis can give a better understanding of the intrinsic link between the plasmonic effects and Fabry-Perot effect. The TE 10 and TE 30 modes hybridize with channel plasmon polaritons (CPPs) modes and surface plasmon polaritons (SPPs) modes respectively. Experiments are carried out to verify the numerical results. These results are of great significance for understanding the internal mechanism of the bowtie aperture for coupling light to a sub-diffraction limited spot with high transmission efficiency.