Abstract
In this research paper, a new type of Fano resonance originating from the far-field interference of lattice collective resonances of two sets of interlacing silver particle arrays with different radii is investigated numerically. The anti-phased collective resonance of the two arrays acts as “dark state”, while the phased one serves as “bright state”. The structure has the advantage to achieve both high modulation depth and sharp linewidth simultaneously, which is very attractive for plasmonic sensor, and the sensitivity and figure of merit can reach as high as 633 nm/RIU and 2000, respectively. Also, the structure has the merit of high Q factor up to 320.
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