Silicon-silver metasurface based on regular bars as an effective SERS substrateстатья
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Дата последнего поиска статьи во внешних источниках: 23 декабря 2020 г.
Аннотация:Observation of the surface enhanced Raman scattering (SERS) is hampered by the background surface luminescence. We investigate the metasurface made of periodic silicon micro bars. Bars are covered by the silver nanolayer. Computer simulations as well as real experiment reveal an anomalous optical response of the metasurface, which is due to the excitation of various metal-dielectric surface resonances. We demonstrate the enhancement of the Raman signal from a monolayer of 4-Mercaptophenylboronic acid (MPBA) when it is deposited on the microbar metasurface. The micro-bar metasurface exhibits large Raman/luminescence (signal/noise) ratio. As result it operates as a very efficient SERS substrate.