Exploring the Optical Potential of Nano-Bismuth: Tunable Surface Plasmon Resonances in the Near Ultraviolet-to-Near Infrared Range

2012 ◽  
Vol 116 (38) ◽  
pp. 20530-20539 ◽  
Author(s):  
Johann Toudert ◽  
Rosalia Serna ◽  
Miguel Jiménez de Castro
Keyword(s):  
Surface Plasmon ◽  
Optical Potential ◽  
Near Infrared ◽  
Infrared Range ◽  
Surface Plasmon Resonances ◽  
Near Ultraviolet ◽  
Plasmon Resonances ◽  
Near Infrared Range

scholarly journals Joint Measurements of PM<sub>2.5</sub> and light-absorptive PM in woodsmoke-dominated ambient and plume environments

2017 ◽  
Author(s):  
K. Max Zhang ◽  
Bo Yang ◽  
Geng Chen ◽  
Jiajun Gu ◽  
James Schwab ◽  
...  
Keyword(s):  
Near Infrared ◽  
Uv Light ◽  
Operating Conditions ◽  
Infrared Range ◽  
Wood Combustion ◽  
Near Ultraviolet ◽  
Linear Relationships ◽  
Saranac Lake ◽  
Near Infrared Range ◽  
Strong Linear Relationship

Abstract. DC, also referred to as Delta-C, measures enhanced light absorption of particulate matter (PM) samples at the near-ultraviolet (UV) range relative to the near-infrared range, which has been proposed previously as a woodsmoke marker due to the presence of enhanced UV light absorbing materials from wood combustion. In this paper, we further evaluated the applications and limitations of using DC as both a qualitative and semi-quantitative woodsmoke marker via joint continuous measurements of PM2.5 (by nephelometer pDR-1500) and light-absorptive PM (by 2-wavelength and 7-wavelength Aethalometer®) in three Northeastern U.S. cities/towns including Rutland, VT, Saranac Lake, NY and Ithaca, NY. We compared the pDR-1500 against a FEM PM2.5 sampler (BAM 1020), and identified a close agreement between the two instruments in a woodsmoke-dominated ambient environment. The analysis of seasonal and diurnal trends of DC, BC (880 nm) and PM2.5 concentrations supports the use of DC as an adequate qualitative marker. The strong linear relationships between PM2.5 and DC in both woodsmoke-dominated ambient and plume environments suggest that DC can reasonably serve as a semi-quantitative woodsmoke marker. We proposed a DC-based indicator for woodsmoke emission, which was then shown to exhibit relatively strong linear relationship with heating demand. While we observed reproducible PM2.5-DC relationships in similar woodsmoke-dominated ambient environments, those relationships differ significantly with different environments, and among individual woodsmoke sources. DC correlated much more closely with PM2.5 than EcoChem PAS2000-reported PAH in woodsmoke-dominated ambient environments. Our analysis also indicates the potential for PM2.5-DC relationships to be utilized to distinguish different combustion and operating conditions of woodsmoke sources, and that DC-Heating demand relationships could be adopted to estimate woodsmoke emissions. However, future studies are needed to elucidate those relationships.

Tunable localized surface plasmon resonances of asymmetric Au/SiO2/Au cross-shape nanobars

2014 ◽  
Vol 28 (17) ◽  
pp. 1450143 ◽  
Author(s):  
M. L. Wan ◽  
H. J. Du ◽  
Y. L. Song ◽  
F. Q. Zhou ◽  
K. J. Dai
Keyword(s):  
Electric Fields ◽  
Surface Plasmon ◽  
Near Infrared ◽  
Dipole Approximation ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonances ◽  
Localized Surface Plasmon Resonances ◽  
Plasmon Resonances ◽  
Surface Enhanced Raman ◽  
Infrared Spectral

The plasmonic properties of asymmetric Au / SiO 2/ Au sandwiched cross-shape nanobars are investigated theoretically using the discrete dipole approximation (DDA) method. Two localized surface plasmon resonances are observed in the extinction spectra, which perform extreme sensitivity to the length and width of the nanobar and can be tuned easily throughout visible and into near-infrared spectral regions. The local electric fields around the nanobar are calculated and a pure electromagnetic Raman enhancement factor of about 106 can be achieved. In addition, compared to a monolayer gold nanobar, it exhibits more "hot spots" and stronger localized electric field enhancements. This plasmonic substrate provides potential applications in surface enhanced Raman scattering (SERS) and nonlinear optical devices.

scholarly journals Multiple Surface Plasmon Resonances and Near-Infrared Field Enhancement of Gold Nanowells

2008 ◽  
Vol 80 (13) ◽  
pp. 4945-4950 ◽  
Author(s):  
Kebin Li ◽  
Liviu Clime ◽  
Lilin Tay ◽  
Bo Cui ◽  
Matthias Geissler ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Near Infrared ◽  
Field Enhancement ◽  
Surface Plasmon Resonances ◽  
Plasmon Resonances ◽  
Multiple Surface Plasmon Resonances

Tunable near-infrared localized surface plasmon resonances of djurleite nanocrystals: effects of size, shape, surface-ligands and oxygen exposure time

2015 ◽  
Vol 3 (26) ◽  
pp. 6686-6691 ◽  
Author(s):  
Dongxu Zhu ◽  
Aiwei Tang ◽  
Haihang Ye ◽  
Miao Wang ◽  
Chunhe Yang ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Exposure Time ◽  
Near Infrared ◽  
Resonance Absorption ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonances ◽  
Surface Ligands ◽  
Localized Surface Plasmon Resonances ◽  
Oxygen Exposure ◽  
Plasmon Resonances

The effects of size, shape, surface ligands and oxygen exposure time on the localized surface plasmon resonance absorption in monoclinic djurleite nanocrystals have been demonstrated.

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