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Plasmon localization and giant fields in holographic metasurface for SERS sensors

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Version 2 2023-06-08, 12:49
Version 1 2023-01-12, 14:26
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posted on 2023-06-08, 12:49 authored by Andrey K. Sarychev, Andrey Ivanov, Andrey N. Lagarkov, Gregory Barbillon, Igor Bykov, Ilya Ryzhikov, Konstantin Afanasev, Nikita Bakholdin, Mikhail Mikhailov, Alexander Smyk, Alexander Shurygin, Alexander Shalygin
We present SERS-active metal holographic metasurfaces fabricated from metal periodical nanograting deposited on a dielectric substrate. The metasurface consists of a modulated dielectric, which is covered by a thin silver layer. The metasurface operates as an open plasmon resonator. The theory of plasmons excited in the open resonator formed by a metal nanograting is presented. The large local electromagnetic field is predicted for optical frequencies. The excitation of plasmons is experimentally demonstrated in the metasurface designed on a 4-inch Si wafer. The enhancement of the local electric field results in surface-enhanced Raman scattering (SERS). To investigate the SERS effect, the metasurfaces are covered by molecules of 4-mercaptophenylboronic acid, which form covalent bonds with the silver nanolayer and serve as a proof-of-concept. Finally, we obtain a detection limit of 230 nM for molecules of 4-mercaptophenylboronic acid.

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