Journal
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
Volume 8, Issue 2, Pages 94-101Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.photonics.2009.10.001
Keywords
Enhanced transmission; Modal expansion method
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We investigate the enhanced transmission through the square array of metallic coaxial annular apertures (MCAAs) in microwave frequency by varying the inner diameter of the apertures. The impact of local resonance is thoroughly embodied in the even-mode surface resonances, while the odd-mode surface resonances, invisible in measurements, are only scaled by periodicity. For MCAAs with smaller inner diameters, the transmission extrema are measured at specific incident angles matching the folded degenerate resonant states. The results are well understood in terms of the dispersion of surface resonances. (C) 2009 Elsevier B.V. All rights reserved.
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