Journal
OPTICS EXPRESS
Volume 19, Issue 22, Pages 21425-21431Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.021425
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Funding
- NSFC [11174221, 10974144]
- CNKBRSF [2011CB922001]
- NCET [07-0621]
- STCSM
- SHEDF [06SG24]
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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. (C) 2011 Optical Society of America
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