scholarly journals Electroabsorption in Metallic Nanoparticles within Transparent Dielectric Media

2020 ◽  
Vol 10 (14) ◽  
pp. 4904
Author(s):  
Mrinal Thakur ◽  
Justin Van Cleave
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Metallic Nanoparticles ◽  
Conductive Polymer ◽  
Dielectric Media ◽  
Transparent Dielectric ◽  
Electro Optic ◽  
Kerr Coefficient ◽  
Ac Fields

Electroabsorption in metallic nanoparticles within transparent dielectric media has been measured. In particular, gold nanoparticles in glass and subnanometer-size metallic domains in iodine doped nonconjugated conductive polymer have been studied. Measurements have been made for applied ac fields at 4 kHz, at a wavelength close to the onset of the surface plasmon resonance. The measured electroabsorption (imaginary part of χ(3) or Kerr coefficient) has a quadratic dependence on electric field. Its magnitudes were compared for different sizes of the metallic nanoparticles down to the subnanometer-size particles in iodine-doped nonconjugated conductive polymer. As in the case of quadratic electro-optic effect reported earlier, electroabsorption has approximately a 1/d3 dependence, d being the diameter of nanoparticle. This is consistent with existing theories on confined metallic systems.

scholarly journals Syntheses of gold and silver dichroic nanoparticles; looking at the Lycurgus cup colors

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Floris Dekker ◽  
Lars Kool ◽  
Anton Bunschoten ◽  
Aldrik H. Velders ◽  
Vittorio Saggiomo
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Metallic Nanoparticles ◽  
Visual Media ◽  
The Other ◽  
Colored Glass ◽  
Small Particles ◽  
Red Color ◽  
Public Demonstrations

AbstractMetallic nanoparticles are small particles, with dimensions of less than 100 nm, which have unique characteristics. For example, the color of a nanoparticle solution is given by the surface plasmon resonance, in contrast to only absorbance of a molecule. Metallic nanoparticles have been used in the antiquity for the production of colored glass. Many of the medieval cathedral red windows are in fact, stained with gold nanoparticles. However, presenting just a red solution to a class and explaining that the solution contains gold nanoparticles can be disappointing as the red color can be obtained in many different ways without the need of nanoparticles. Something peculiar, like dichroism, can, on the other hand, shine the interest of an observer to the “nano-world”. Dichroic nanoparticles show different colors when illuminated from the front (scattering) or from the back (transmission). This effect is unique for nanoparticles and nanostructures in general and can generate the “WOW” effect in class or during public demonstrations. In this article we present a simple synthesis of dichroic silver and gold nanoparticles. Solutions of such nanoparticles are a stunning visual media for demonstrations, outreach and engaging audience in the “nano”world.

scholarly journals Quadratic Electro-Optic Effect in Metal Nanoparticles in a Transparent Dielectric Medium

2019 ◽  
Vol 9 (2) ◽  
pp. 232 ◽  
Author(s):  
Mrinal Thakur ◽  
Justin Van Cleave
Keyword(s):  
Gold Nanoparticles ◽  
Metal Nanoparticles ◽  
Low Cost ◽  
Dielectric Medium ◽  
Metallic Particles ◽  
Transparent Dielectric ◽  
Electro Optic ◽  
Kerr Coefficient ◽  
New Applications ◽  
First Time

The quadratic electro-optic effect/Kerr coefficients were measured for the first time for metal nanoparticles. In particular, gold nanoparticles in glass were studied. Measurements were made using the field-induced birefringence method at a wavelength near the onset of the surface plasmon resonance. The magnitudes of the Kerr coefficients for different sizes of gold nanoparticles in glass were measured and compared with that of subnanometer size metallic particles in non-conjugated conductive polymers. The magnitude of the Kerr coefficient was found to increase rapidly (about d−3) when the diameter, d, of the nanoparticles was decreased. This is consistent with the existing theories and understanding of nonlinear optics in metal nanoparticles. The results imply a broad range of new applications of metal nanoparticles in electro-optic switching/modulation, low-cost Kerr cells and other uses in optoelectronics.

scholarly journals Nanocrystalline TiO2 Sensitive Layer for Plasmonic Hydrogen Sensing

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1490
Author(s):  
Enrico Gazzola ◽  
Michela Cittadini ◽  
Marco Angiola ◽  
Laura Brigo ◽  
Massimo Guglielmi ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonance Sensor ◽  
Sensitive Layer ◽  
Plasmonic Sensor ◽  
Nanocrystalline Tio2 ◽  
Resonance Sensor

Solution processed TiO2 anatase film was used as sensitive layer for H2 detection for two plasmonic sensor configurations: A grating-coupled surface plasmon resonance sensor and a localized surface plasmon resonance sensor with gold nanoparticles. The main purpose of this paper is to elucidate the different H2 response observed for the two types of sensors which can be explained considering the hydrogen dissociation taking place on TiO2 at high temperature and the photocatalytic activity of the gold nanoparticles.

scholarly journals Surface plasmon resonance in CdSe semiconductor coated with gold nanoparticles

2008 ◽  
Vol 16 (9) ◽  
pp. 6202 ◽  
Author(s):  
A. K. Pradhan ◽  
R. B. Konda ◽  
H. Mustafa ◽  
R. Mundle ◽  
O. Bamiduro ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance
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