Journal
OPTICS EXPRESS
Volume 24, Issue 15, Pages 16822-16834Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.016822
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- Ministry of Science and Technology, Taiwan (MOST) [104-2112-M-006-017, 103-2112-M-006-006, 102-2112-M-006-011, 101-2112-M-006-015]
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Avoided resonance crossings (ARC) in plasmonic nanodisk structures due to near field or far field couplings were numerically demonstrated. Near field coupling in disk dimmer with both vertical or side-by-side arrangement leads to both energy and linewidth anti-crossing by varying one disk size across the other. Far field coupling in double layered disk arrays of extremely small gap size or gap size with Fabry Perot resonant condition close to the frequency selective surface (FSS) stopband center leads to non-reciprocal absorption spectrum as one disk size varying across the other. We observe linewidth anti-crossing but energy crossing of the absorption peak from different side illumination by varying either the size of one disk array or the gap in hetero disk arrays. The disappearing of Fabry-Perot resonant mode from one side illumination and the appearing of nonreciprocal nearly perfect absorption from the other side illumination are well explained by a FSS-Fabry-Perot model. (C) 2016 Optical Society of America
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