Open AccessOptical transmission through compound gold surface relief slit arrays
Author(s) -
Xin Zhou,
Jianshu Fang,
Diwu Yang,
Xuehui Zhao,
Bin Tang,
Zhimin Liu
Publication year - 2014
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.22.001085
Subject(s) - optics , dielectric , slit , materials science , surface plasmon , resonance (particle physics) , reflection (computer programming) , surface plasmon resonance , extraordinary optical transmission , spectral line , absorption (acoustics) , finite difference time domain method , grating , surface plasmon polariton , attenuated total reflection , transmission (telecommunications) , electric field , attenuation coefficient , plasmon , optoelectronics , physics , atomic physics , infrared , nanotechnology , astronomy , computer science , nanoparticle , programming language , electrical engineering , engineering , quantum mechanics
The optical transmissions through compound gold surface relief slit arrays were investigated theoretically by using the finite difference time domain method. The differences of transmission, reflection, and absorption spectra of the bare slit and the surface relief grating are discussed. The transmission spectra influenced by different dielectric constants of medium in the two slits and different slits widths. When the two slits fill different dielectrics, the presence of the medium induces a red-shift of the plasmon resonances. Along with the dielectric constant in one slit increasing, there appear obvious dips in the transmission spectra. Based on the magnetic and electric field distributions, Fabry-Pérot-like resonance and phase resonance mechanisms have been suggested for the physical origins of these observations.