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arXiv · 2111.05521

Plasmon localization and giant fields in holographic metasurface for SERS sensors

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
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Abstract

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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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. 2021-11-10. Plasmon localization and giant fields in holographic metasurface for SERS sensors. https://arxiv.org/abs/2111.05521

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