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In surface-enhanced Raman scattering (SERS), the giant field enhancements generated by plasmonic nanostructures compensate for the relatively weak Raman scattering cross sections of many molecules. The effect is so substantial that Raman spectroscopy can be performed on single molecules (e.g., [1]). A structure that has proven especially effective for SERS is the dimer nanoantenna, i.e., two metal...
The development of integrated approaches for optical trapping, based on photonic or plasmonic structures fabricated on a chip, offers several compelling advantages. First, chip-based optical traps enable the trapping platform to be miniaturized. Second, the chip-based configuration lends itself naturally to the incorporation of sensing modalities. Third, optical nanostructures can generate strong...
Surface enhanced Raman scattering (SERS) is undergoing a renaissance, spurred largely by developments in the burgeoning field of plasmonics. This paper reviews the current status and future directions in plasmonic nanostructures for SERS. We show that engineered plasmonic nanostructures enable exciting new functionalities, including beamed Raman scattering and highly reproducible chips for single...
We experimentally demonstrate a dielectric metamaterial comprising silicon nanofins on a glass substrate. Left- and right-circularly polarized beams incident upon the device are deflected into different directions. Our approach avoids the efficiency issues of plasmonics.
We fabricate plasmonic dimers consisting of two metallic nanostructures spaced by a few angstroms using lithographic methods, and show that quantum mechanical tunneling across the gaps limits the enhancement in surface-enhanced Raman scattering.
Making use of the field enhancement and confinement, and thermal management, of a template-stripped localized surface plasmon resonance structure, we experimentally demonstrate the trapping and rotation of 110 nm diameter polystyrene nanoparticles.
We study a structure consisting of a gold disk array, an SiO2 spacer, and a gold film. We study the effect of spacer thickness on the anti-crossing between localized plasmons and surface plasmon polaritons.
We experimentally demonstrate enhanced propulsion of polystyrene and gold particles by surface plasmon polaritons on gold stripes. The largest propulsion velocity enhancement, relative to total internal reflection, is measured to be 5 for polystyrene particles.
Surface enhanced Raman spectroscopy is performed on mixed dimers, consisting of pairs of gold nanoparticles with different shapes and plasmon frequencies. These are termed double resonance substrates. The results are compared to double dimer geometry.
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