Abstract
We have designed a detuned double-L-shaped nanohole arrays in the metallic film, on which the hybridized plasmonic quadrupolar and dipolar resonance modes can be excited by the incident light, respectively. Compared with the conventional plasmonic resonance modes, the antibonding quadrupolar resonance mode has a higher quality factor due to its lower radiative loss. A quality factor of 38 (theoretical prediction exceeding 100) is obtained in the experiment.
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