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RESEARCH PRODUCT

Novel plasmonic sensor design using plasmon-induced transparency

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description

We introduce a novel sensor concept in the field of plasmonics, namely plasmon-induced transparency sensors. These sensors combine localized particle plasmon resonances with extremely small sensing volume with excellent sharp spectral resonances that show a good respose to refractive index changes of the surrounding environment. The principle is based on the plasmonic analog of electromagnetically induced transparency (EIT) between a radiative dipole and a nonradiative quadrupole antenna. This effect yields a spectrally narrow resonance within a broad localized particle plasmon resonance in the near-infrared spectral region [1, 2]. Using deposition of biotin and streptavidin, we demonstrate reproducibly detection of a single molecular monolayer. With aequous glucose solution, a planar version of our detector shows sensitivity values of over 500 nm/RIU and figures of merit (sensitivity over FWHM) of more than 5 [3]. These are the highest sensitivity values and figures of merit from lithographically manufactured localized plasmon resonance sensors to our knowledge.