The anomalously high transmission into the system "dielectric grating-metal thin film-dielectric grating"

The analysis of the transmission of system "dielectric grating- thin metal film-dielectric grating-substrate" is conducted by method of coupled waves. The 53 diffraction orders are used at the analysis that ensures the suitable precision of numerical calculations. It is reveal, that at the certain parameters the system has the anomalously high transmission for the reflection of about zero. For example, the silver film with thickness of 0.0385 μm, which is placed between a two grating with the certain parameters, transmits more than 0.86 and 0.83 for TE and TM polarizations, respectively, at wave-length of 1.5 μm. Under vacuum the silver film of the same thickness has the reflection more than 0.98 and transmits less than 0.004. The analogical results are obtained for other metals: cold and potassium. The transmittance value sharply decreases at deviation of wavelength from optimum magnitude. Basing on such structures it is possible to build the narrow-banded filters. The effect of great transmission can be explained in the following way. The gratings serve as matched elements of impedance for the thin metal film and of impedance for homogeneous mediums. The field distribution inside structure meets standing wave, node of which placed on thin metal film that leads to low absorption.

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