Open AccessSize dependence of band-gaps in a one-dimensional plasmonic crystal
Author(s) -
H. Watanabe,
Masahiro Honda,
Naoki Yamamoto
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.22.005155
Subject(s) - optics , plasmon , cathodoluminescence , surface plasmon polariton , surface plasmon , materials science , crystal (programming language) , band gap , physics , optoelectronics , luminescence , computer science , programming language
The dependence of the plasmonic band gap on size of a one-dimensional plasmonic crystal with a rectangular cross-section has been investigated by cathodoluminescence, using a 200-keV scanning transmission electron microscope. The band edge character at points Γ and X changes in correlation with the corresponding Fourier component of the surface shape. The calculation by the rigorous coupled-wave analysis (RCWA) method reproduces well the observed size dependence of the band edge energies on terrace width and height, though some deviation in magnitude remains. The beam-scan spectral images clearly reveal symmetric and anti-symmetric characters of the standing waves of the band edge modes. The two modes at the band edges are different in the surface plasmon Polariton (SPP)-light conversion efficiency and exchange their energy positions by changing terrace width.