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Opt Express. 2011 Oct 24;19(22):21425-31. doi: 10.1364/OE.19.021425.

Broadband transparency achieved with the stacked metallic multi-layers perforated with coaxial annular apertures.

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Tongji University, Shanghai, 200092, China.


It is generally believed that, in the phenomena of extraordinary optical transmission, perfect transparency only occurs at a single or a multiple of discrete frequencies. This report presents for the first time that a stacked metallic multi-layered system, being perforated with coaxial annular apertures (CAAs), can be perfectly transparent in a broad frequency range. The phenomenon arises from the coupling of guided resonance modes in CAAs among different metallic layers. The transparency bandwidth is extended to about 40% of the central frequency with only 2-3 metallic layers. Measured transmission spectra in microwave regime are in good agreement with calculations which are semi-analytically resolved by modal expansion method.

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