title: Size dependence of band-gaps in a one-dimensional plasmonic crystal.
abstract: 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.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Watanabe
authors.forename: Masahiro
authors.initials: M
authors.lastname: Honda
authors.forename: Naoki
authors.initials: N
authors.lastname: Yamamoto