Enhanced optical transmission (EOT) through subwavelength apertures is usually obtained for p-polarized light. The
present study experimentally investigates EOT for s-polarized light. A subwavelength slit surrounded on each side by
periodic grooves has been fabricated in a gold film and covered by a thin dielectric layer. The excitation of s-polarized
dielectric waveguide modes inside the dielectric film strongly increases the s-polarized transmission. Transmission
measurements are compared with a coupled mode model and show good qualitative agreement. Adding a waveguide can
improve light transmission through subwavelength apertures, as both s and p-polarization can be efficiently transmitted.
The detailed theoretical analysis of the fine optical phenomena
caused by surface plasmon polariton (SPP) excitation in a metallic
film with weakly modulated dielectric permittivity is made for
both symmetrical and nonsymmetrical dielectric arrangements. SPP
modes in the film are close to those existing at an interface
between metal and dielectric half spaces (these polaritons are
weakly coupled under the symmetrical surrounding), and the effect
of enhanced light transmission (ELT) caused by photon-SPP-photon
transformations can occur. The advantage of the approach used is
that we present the most interesting results in a simple
analytical form. The dispersion relation for the film SPP for both
arrangements is investigated. On this basis the comprehensive
examination of the ELT effect is performed. The parameters of the
problem (optimal film thickness, optimal modulation amplitude)
responsible for total suppression of the zeroth- and/or
nonzeroth-order reflected waves and maximal transmission are
found. The results are of essential interest for optical
nano-devices design.
An analytical treatment of optical surface plasmon-polaritons (SPP) existing on double-periodic high reflective media is presented. Periodicity, caused by the modulation of either complex dielectric permittivity or relief of the surface leads to the change of SPP dispersion relation due to coupling of the inoculating SPPs existing on the unmodulated boundary, and frequency gaps arising at the Brillouin zone edges. The SPP spectra for different types of periodicity/symmetry are investigated, in particular, the different couplings between several initial SPP are compared. Simple analytical expressions for the SPP dispersion relation are obtained using modified perturbation theory. The dependence of the dispersion relation on the parameters of the problem is examined.
The results of analytical and numerical investigation of the surface plasmon-polaritons (SPP)dispersion relation on double periodical high reflecting surfaces (two-dimensional photonic crystals)are presented. The formalism is developed for gratings formed by the modulation of either optical properties or the relief of the medium. The coupling between SPP existing on the non-modulated boundary leads to the mini-gaps arising at the Brillouin-zone boundaries. The dependence of the dispersion relation upon the parameters of the problem (amplitude of
the modulation, an angle between the elementary translations,etc.) is calculated for different types of symmetry that corresponds to the coupling from two to six polaritons. The specific values of the parameters corresponding to existence of the standing polariton modes, vanishing of the polariton group velocity are found. The distribution of surface charges for corresponding polariton modes is presented. The ratio between the polariton dispersion relation and the light diffraction under the condition of the polariton excitation is discussed as well. The results obtained can be used to design the two-dimensional photonic crystals with specific and given properties.
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