Excitation of surface plasmon-polaritons in metal films with double periodic modulation: Anomalous optical effects

Abstract

We perform a thorough theoretical analysis of resonance effects when an arbitrarily polarized plane monochromatic wave is incident onto a double periodically modulated metal film sandwiched by two different transparent media. The proposed theory offers a generalization of the theory that had been build in our recent papers for the simplest case of one-dimensional structures to two-dimensional ones. A special emphasis is placed on the films with the modulation caused by cylindrical inclusions, hence, the results obtained are applicable to the films used in the experiments. We discuss a spectral composition of modulated films and highlight the principal role of "resonance" and "coupling" modulation harmonics. All the originating multiple resonances are examined in detail. The transformation coefficients corresponding to different diffraction orders are investigated in the vicinity of each resonance. We make a comparison between our theory and recent experiments concerning enhanced light transmittance (ELT) and show the ways of increasing the efficiency of these phenomena. In the appendix we demonstrate a close analogy between ELT effect and peculiarities of a forced motion of two coupled classical oscillators.

Resonant Enhancement of Magneto-Optical Activity Induced by Surface Plasmon Polariton Modes Coupling in 2D Magnetoplasmonic Crystals

“…These broadening and red-shifting of WAs excitable with both polarizations, when the light polarization is changed from p to s, has been already observed in PCs. 4,5 In Figure 3c, we display the reflectivity spectra of the 2D-MPC for s-polarization, ϕ = 45°and for the same values of θ. Now, the s-polarized incident light can resonantly excite only one SPP mode in the wavelength range 500−650 nm, whose θdispersive behavior displayed by the corresponding WA is the same as that of the WA appearing at longer wavelength in the same spectral range using p-polarized light.…”

“…The simple perturbative approach used to identify the bands does not take into account neither of the dimensions of the holes nor of the field symmetry-related selection rules that determine the cross section of the light-SPP coupling. 5,9,20,31 In spite of this limitation, the plasmonic dispersion bands calculated using the perturbative approach correlate well to the salient features in the 2D reflectivity intensity maps obtained from numerical simulations using the SMM technique, in the angles range 0− 70°for p-and s-polarization (Figure 4b,c and d,e, respectively) and for the two azimuth angles investigated (ϕ = 0°in Figure 4b,d, and ϕ = 45°in Figure 4c,e). Solid and dashed black lines in Figure 4b−e identify plasmonic bands for collinear and noncollinear modes, respectively.…”

Nonlinear reflection from the surface of neutron stars and features of radio emission from the pulsar in the Crab nebula

“…HFC1 is shifted to a frequency of 8.. This could already be considered a good agreement, given the crudity of the model and the30   width of the high frequency component.…”

“…The resonance Wood wave, therefore, corres-. For large inclinations of the surface qζ compared to the impedance, the former influence the magnitude and position of the resonance 29,30. This sort of shift (also in the presence of dissipation) has been observed in experiments 31,32 on the reflection of electromagnetic waves by a diffraction grating under the conditions of the Wood anomaly.…”

“…6 In individual cases, such as an almost ideal conducting medium, the resonance character of the grazing scattered wave leads to such a large increase in its amplitude that it becomes necessary to consider the essentially nonlinear problem drawing on higher order diffraction spectra than the first. The relationships among the various small parameters 29,30 become important and affect the shift in the resonance.…”