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ISSN Печать: 0040-2508
ISSN Онлайн: 1943-6009
Indexed in
Resonance Optical Transmission through Periodically Modulated Metal Films
Краткое описание
The sophistical treatment has performed of light tunneling through a metal film, thickness of which exceeds significantly the skin-depth and with a weak modulation of parameters (dielectric permittivity, surface geometry, etc.), taking into account the absorption. Owing to the periodicity, under a defined relation between the angle of incidence, the spatial modulation period, and the wavelength, the process of transforming photons of the incident wave to surface plasmon-polaritons (in terms of the classical principles, that is resonance excitation of symmetrical and antisymmetrical plasmon-polariton modes) takes place, which leads to the essential change in reflectivity and transmission. The cases of incline and normal incidence which correspond to the resonances of different multiplicities (single, double, and fourfold) are investigated. It is found that even for a weak modulation the effect of practically total light transmission occurs (under conditions of practically total opaqueness of an unmodulated film). The systematic use of small parameters has allowed us to present the results in a convenient analytical form. Optimal combinations of parameters (film thickness, modulation depth, etc.) which correspond to maximal transmission have been found. The results are of essential interest in dealing with the problems of optical information technology, in particular, for nano-chip design.