Additional enhancement of SERS effect by a surface wave in photonic crystalстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 11 марта 2020 г.
Аннотация:We propose and demonstrate an enhancement of the Raman signal additional
to that provided by the surface‐enhanced Raman spectroscopy (SERS) effect.
Such an additional enhancement appears due to a resonance attributed to
the existence of a surface wave at a photonic crystal (PC)/vacuum interface.
Such a PC is realized as a system of alternating layers deposited on a prism,
through which light enters the structure. The SERS‐active layer of aggregates
of gold nanoparticles modified by dithionitrobenzoic acid is deposited on the
PC/vacuum interface, where the resonant field is located. In the experiment,
up to 170‐fold SERS signal enhancement is demonstrated with respect to the
same SERS‐active layer deposited at a nonresonant substrate.