Abstract
Metal-dielectric micro/nano-composites have surface plasmon resonances in visible and near-infrared domains. Excitation of coupled metal-dielectric resonances is also important. These different resonances can allow enhancement of the electromagnetic field at a subwavelength scale. Hybrid plasmonic structures act as optical antennae by concentrating large electromagnetic energy in micro- and nano-scales. Plasmonic structures are proposed for various applications such as optical filters, investigation of quantum electrodynamics effects, solar energy concentration, magnetic recording, nanolasing, medical imaging and biodetection, surface-enhanced Raman scattering (SERS), and optical super-resolution microscopy. We present the review of recent achievements in experimental and theoretical studies of metal-dielectric micro and nano antennae that are important for fundamental and applied research. The main impact is application of metal-dielectric optical antennae for the efficient SERS sensing.
Highlights
We present recent results in plasmonics of metal-dielectric composites and metasurfaces
The specially designed metal nanostructures serve as optical antennae, which opens exciting opportunities in fundamental physics studies, and in plasmonic applications such as optical signal processing on a nanoscale, medical imaging and biodetection, optical super-resolution microscopy [4], magnetic recording assisted by heat [5,6], quantum electrodynamics studies [7], nanolasing, and solar energy concentrators [8]
Surface plasmons in metal nanoparticles interact with EM modes in the dielectric cone, which results in huge enhancement of the local electric field
Summary
We present recent results in plasmonics of metal-dielectric composites and metasurfaces. The degradation reaches the highest value in maxima of the local electric field Another issue for metalic nanoparticles is the chemical instability. Due to a long lifetime of a WGM, a single molecule or virus can be detected on the cavity surface [58,59] In this last decade, the concentration of electric and magnetic fields in the dielectric micro-structures has had a great amount of attention [60,61]. The enhancement of light was obtained with a ring of plasmonic nanoparticles coupled to a dielectric micro-resonator [65]. The surface plasmon resonance of the nanoparticle ring enables the EM field enhancement close to the dielectric micro-resonator surface. The electric field is significantly less important in the case of a dielectric resonator and when the metallic nanoparticles are spatially separated [66]. The enhancement of SERS signal is increased by combining plasmonic and dielectric resonators
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