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Highly sensitive optical sensing of molecules can be achieved by using localized surface plasmon generated at metal nanostructures, such as SERS-based sensing. We fabricated SERS-active silver nanostructures by using polarized light irradiation, and evaluated their response properties to rhodamine 6G. In this paper, it is shown that strong Raman signals of rhodamine 6G and large variation in optical...
Here, we report the ensemble-averaged measurement of SERS hot spots EF from spatially isolated colloidal nanoclusters. This approach was achieved by well-defined Au@Ag core-shell NP dimers and trimers-the simplest structure to investigate SERS hot spots phenomenon. These hot spots units with similar nature were made up of uniform Au@Ag NPs attached by a close-paking Raman reporter monolayer, then...
This paper describes the fabrication of highly efficient plasmonics-active SERS substrates - having metallic nanowire structures with pointed geometries and sub-5 nm gap between the metallic nanowires enabling concentration of high EM fields in these regions - on a wafer-scale by a reproducible process that is compatible with large-scale development of these substrates. These SERS substrates were...
This research describes theoretical and experimental evaluations of electromagnetic fields around ordered arrangements of gold and silver nano-pillars. Finite difference time domain method is employed in simulating the periodic arrangements of nano-pillars having different geometries. Metallic nanostructures are developed using the focused ion beam (FIB) milling process. These structures are also...
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