Highly-reproducible Raman scattering of NaYF4:Yb,Er@SiO2@Ag for methylamphetamine detection under near-infrared laser excitation

The Analyst ◽  
2015 ◽  
Vol 140 (15) ◽  
pp. 5268-5275 ◽  
Author(s):  
Yongmei Ma ◽  
Honglin Liu ◽  
Zhenzhen Han ◽  
Liangbao Yang ◽  
Jinhuai Liu
Keyword(s):  
Raman Scattering ◽  
Near Infrared ◽  
Laser Excitation ◽  
Infrared Laser ◽  
Raman Enhancement ◽  
Infrared Excitation

NaYF4:Yb,Er@SiO2@Ag displays highly-reproducible Raman enhancement ability for methylamphetamine detection under near-infrared excitation.

Raman scattering and plasmonic photocatalysis of single particles of NaYF4:Yb,Er@Ag under near-infrared laser excitation

The Analyst ◽  
2014 ◽  
Vol 139 (22) ◽  
pp. 5983-5988 ◽  
Author(s):  
Yongmei Ma ◽  
Honglin Liu ◽  
Zhenzhen Han ◽  
Liangbao Yang ◽  
Bai Sun ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Noble Metal ◽  
Near Infrared ◽  
Laser Excitation ◽  
Infrared Laser ◽  
Single Particles ◽  
Metal Composites

Upconversion material-noble metal composites initiate greatly improved Raman scattering and plasmon photocatalysis, promising a novel direction for fabricating SERS-active nanostructures.

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.

Reverse Intersystem Crossing in Rhodamines by Near-Infrared Laser Excitation

2014 ◽  
Vol 118 (34) ◽  
pp. 6985-6990 ◽  
Author(s):  
Christel M. Marian ◽  
Mihajlo Etinski ◽  
Vidisha Rai-Constapel
Keyword(s):  
Near Infrared ◽  
Laser Excitation ◽  
Infrared Laser ◽  
Intersystem Crossing
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