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We have designed and experimentally demonstrated a radial and azimuthal polarization converter, which is a plasmonic metasurface with a radius of not more than $5~\mu \text{m}$ . The metasurface is composed of an array of metal–insulator–metal gap plasmon resonators, each of which reflects the incident local electric field to a predesignated polarization angle. The simulation results show effective...
Nanoshells are one of versatile plasmonic nanostructures in biomedical applications due to highly tunable optical properties and near-field enhancement. By exciting the nanoshell-plane junction with a radially polarized (RP) focused excitation, we have obtained further near-field boosting and consequent highly sensitive surface enhanced Raman scattering (SERS) of a monolayer of malachite green isothiocyanate...
A monolayer of MGITC molecules in a gold nanosphere-plane junction is excited by focusing a radially polarized laser beam. A record electromagnetic enhancement factor of 1010 for deterministic SERS experiments has been obtained.
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