Circular slit-groove plasmonic interferometers: a generalized approach to high-throughput biochemical sensing [Invited]

A class of plasmonic interferometers consisting of a circular slit flanked by a concentric circular groove is demonstrated. Laying in-between the conventional bullseye and the linear slit-groove interferometers, these circular slit-groove interferometers show a polarization-insensitive optical response (thanks to the rotational symmetry imposed by the circular geometry), and overall higher light transmission (due to the absence of a cutoff condition in the circular subwavelength slit). Light transmission and sensitivity can be further enhanced by the presence of plasmonic resonant modes excited by the circular slit. The proposed circular plasmonic interferometers can be employed to develop improved biochemical sensors.

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