scholarly journals Light Concentration by Metal-Dielectric Micro-Resonators for SERS Sensing

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 103 ◽  
Author(s):  
Andrey Sarychev ◽  
Andrey Ivanov ◽  
Andrey Lagarkov ◽  
Grégory Barbillon
Keyword(s):  
Quantum Electrodynamics ◽  
Near Infrared ◽  
Super Resolution ◽  
Optical Filters ◽  
Energy Concentration ◽  
Plasmonic Structures ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Super Resolution Microscopy ◽  
Sers Sensing

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.

Novel routes to electromagnetic enhancement and its characterisation in surface- and tip-enhanced Raman scattering

2017 ◽  
Vol 205 ◽  
pp. 121-148 ◽  
Author(s):  
P. Dawson ◽  
D. Frey ◽  
V. Kalathingal ◽  
R. Mehfuz ◽  
J. Mitra
Keyword(s):  
Raman Scattering ◽  
Near Infrared ◽  
Dielectric Material ◽  
Photon Emission ◽  
Electromagnetic Enhancement ◽  
Raman Enhancement ◽  
Surface Enhanced Raman ◽  
Tunnelling Microscopy ◽  
Enhanced Raman Scattering ◽  
Simple Systems

Quantitative understanding of the electromagnetic component in enhanced Raman spectroscopy is often difficult to achieve on account of the complex substrate structures utilised. We therefore turn to two structurally simple systems amenable to detailed modelling. The first is tip-enhanced Raman scattering under electron scanning tunnelling microscopy control (STM-TERS) where, appealing to understanding developed in the context of photon emission from STM, it is argued that the localised surface plasmon modes driving the Raman enhancement exist in the visible and near-infrared regime only by virtue of significant modification to the optical properties of the tip and sample metals (gold here). This is due to the strong dc field-induced (∼109V m−1) non-linear corrections to the dielectric function of goldviathe third order susceptibility term in the polarisation. Also, sub-5 nm spatial resolution is shown in the modelling. Secondly, we suggest a novel deployment of hybrid plasmonic waveguide modes in surface enhanced Raman scattering (HPWG-SERS). This delivers strong confinement of electromagnetic energy in a ∼10 nm oxide ‘gap’ between a high-index dielectric material of nanoscale width (a GaAs nanorod and a 100 nm Si slab are considered here) and a metal, yielding a monotonic variation in the Raman enhancement factor as a function of wavelength with no long-wavelength cut-off, both features that contrast with STM-TERS.

scholarly journals Tuning the Optical Properties of Large Gold Nanoparticle Arrays

2001 ◽  
Vol 676 ◽  
Author(s):  
Beomseok Kim ◽  
Steven L. Tripp ◽  
Alexander Wei
Keyword(s):  
Near Infrared ◽  
High Surface ◽  
Experimental Investigations ◽  
Transmission Electron ◽  
Surface Enhanced ◽  
Air Water Interface ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Infrared Wavelengths ◽  
Aggregate Structures

ABSTRACTGold nanoparticles in the mid-nanometer size regime can undergo self-organization into densely packed monoparticulate films at the air-water interface under appropriate passivation conditions. Films could be transferred onto hydrophilic Formvar-coated Cu grids by horizontal (Langmuir-Schaefer) deposition or by vertical retraction of immersed substrates. The latter method produced monoparticulate films with variable extinction and reflectance properties. Transmission electron microscopy revealed hexagonally close-packed arrays on the micron length scale. The extinction bands of these arrays shifted by hundreds of nanometers to near-infrared wavelengths and broadened enormously with increasing periodicity. Large particle arrays also demonstrated extremely high surface-enhanced Raman scattering (SERS), with enhancement factors greater than 107. Signal enhancements could be correlated with increasing periodicity and are in accord with earlier theoretical and experimental investigations involving nanoparticle aggregate structures.

Effect of Graphene Coating on SERS Performance of Plasmonic Nanostructures Based on Silvered Porous Silicon

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940087
Author(s):  
A. Panarin ◽  
P. Mojzes ◽  
B. Ranishenka ◽  
S. Terekhov
Keyword(s):  
Plasmonic Nanostructures ◽  
Spectral Measurements ◽  
Sers Signal ◽  
Protective Layers ◽  
Graphene Coating ◽  
Plasmonic Structures ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
The Stability

The degradation of the Surface-enhanced Raman scattering (SERS) signal under laser illumination during spectral measurements is typically observed. To improve the stability of the SERS spectra intensity, hybrid plasmonic structures involving graphene-based protective layers were formed. An observation of the time evolution of the characteristic peak from analyte molecules indicates that the graphene coating can be used to improve the stability of the SERS signal.

scholarly journals Bioscaffold arrays decorated with Ag nanoparticles as a SERS substrate for direct detection of melamine in infant formula

RSC Advances ◽  
2019 ◽  
Vol 9 (38) ◽  
pp. 21771-21776 ◽  
Author(s):  
Nan Zhao ◽  
Hefu Li ◽  
Cunwei Tian ◽  
Yanru Xie ◽  
Zhenbao Feng ◽  
...  
Keyword(s):  
High Performance ◽  
Direct Detection ◽  
Three Dimensional ◽  
Sers Substrate ◽  
Sers Substrates ◽  
Plasmonic Structures ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Performance Surface

Three-dimensional (3D) plasmonic structures have been intensively investigated as high performance surface enhanced Raman scattering (SERS) substrates.

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