Femtosecond excitation dynamics in gold nanospheres and nanorods

2005 ◽  
Vol 72 (23) ◽  
Author(s):  
O. P. Varnavski ◽  
T. Goodson ◽  
M. B. Mohamed ◽  
M. A. El-Sayed
Keyword(s):  
Gold Nanospheres ◽  
Excitation Dynamics

Light Absorption and Scattering Spectra of Gold Nanospheres Coated with TDBC J-Aggregates

2020 ◽  
Vol 47 (9) ◽  
pp. 280-284
Author(s):  
S. S. Moritaka ◽  
A. V. Mekshun ◽  
V. S. Lebedev ◽  
A. D. Kondorskii
Keyword(s):  
Light Absorption ◽  
Gold Nanospheres ◽  
Scattering Spectra ◽  
J Aggregates

scholarly journals Aggregation affects optical properties and photothermal heating of gold nanospheres

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yiru Wang ◽  
Zhe Gao ◽  
Zonghu Han ◽  
Yilin Liu ◽  
Huan Yang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Section ◽  
Laser Heating ◽  
Dipole Approximation ◽  
Gold Nanospheres ◽  
Extinction Cross Section ◽  
Heating Efficiency ◽  
Photothermal Heating ◽  
New Framework ◽  
Laser Calorimetry

AbstractLaser heating of gold nanospheres (GNS) is increasingly prevalent in biomedical applications due to tunable optical properties that determine heating efficiency. Although many geometric parameters (i.e. size, morphology) can affect optical properties of individual GNS and their heating, no specific studies of how GNS aggregation affects heating have been carried out. We posit here that aggregation, which can occur within some biological systems, will significantly impact the optical and therefore heating properties of GNS. To address this, we employed discrete dipole approximation (DDA) simulations, Ultraviolet–Visible spectroscopy (UV–Vis) and laser calorimetry on GNS primary particles with diameters (5, 16, 30 nm) and their aggregates that contain 2 to 30 GNS particles. DDA shows that aggregation can reduce the extinction cross-section on a per particle basis by 17–28%. Experimental measurement by UV–Vis and laser calorimetry on aggregates also show up to a 25% reduction in extinction coefficient and significantly lower heating (~ 10%) compared to dispersed GNS. In addition, comparison of select aggregates shows even larger extinction cross section drops in sparse vs. dense aggregates. This work shows that GNS aggregation can change optical properties and reduce heating and provides a new framework for exploring this effect during laser heating of nanomaterial solutions.

scholarly journals Correction to Inducing Cancer Cell Death by Targeting Its Nucleus: Solid Gold Nanospheres versus Hollow Gold Nanocages

2013 ◽  
Vol 24 (8) ◽  
pp. 1414-1414 ◽  
Author(s):  
Megan A. Mackey ◽  
Farhat Saira ◽  
Mahmoud A. Mahmoud ◽  
Mostafa A. El-Sayed
Keyword(s):  
Cell Death ◽  
Cancer Cell ◽  
Gold Nanospheres ◽  
Solid Gold ◽  
Cancer Cell Death ◽  
Gold Nanocages

Close-Packed Colloidal Monolayers of Ultra-Smooth Gold Nanospheres by Controlled Trapping onto Polymer Thin Films

2018 ◽  
Vol 26 (6) ◽  
pp. 539-543 ◽  
Author(s):  
Jun-Min Kim ◽  
Dae-Woong Jung ◽  
Gaehang Lee ◽  
Gi-Ra Yi
Keyword(s):  
Thin Films ◽  
Polymer Thin Films ◽  
Gold Nanospheres

Theoretical studies of excitation dynamics in a peridinin-chlorophyll-protein coupled to a metallic nanoparticle

Open Physics ◽  
2011 ◽  
Vol 9 (2) ◽  
Author(s):  
Mikolaj Schmidt ◽  
Sebastian Mackowski
Keyword(s):  
Energy Transfer ◽  
Metallic Surface ◽  
Energy Transfer Rate ◽  
Metallic Nanoparticle ◽  
Light Harvesting Complex ◽  
Radiative Processes ◽  
Förster Energy Transfer ◽  
Chlorophyll Protein ◽  
Induced Changes ◽  
Excitation Dynamics

AbstractIn this work we study the influence of plasmon excitations on the excitation dynamics within a protein complex embedding two chlorophyll molecules coupled to a gold nanosphere. Small separation between the chlorophylls and metallic nanoparticle allows us to simplify the calculations of the Förster energy transfer rate and non-radiative processes by replacing a spherical nanoparticle with a metallic surface. Our results show modifications of all relevant processes and the energy transfer pathways within the system as well as the radiative processes. Plasmon induced changes result in strong qualitative effects of the fluorescence of the studied light-harvesting complex.

scholarly journals Strong plasmon coupling between two gold nanospheres on a gold slab

2011 ◽  
Vol 13 (7) ◽  
pp. 073040 ◽  
Author(s):  
H Liu ◽  
J Ng ◽  
S B Wang ◽  
Z H Hang ◽  
C T Chan ◽  
...  
Keyword(s):  
Plasmon Coupling ◽  
Gold Nanospheres

scholarly journals Excitation dynamics and relaxation in a molecular heterodimer

2012 ◽  
Vol 404 ◽  
pp. 94-102 ◽  
Author(s):  
V. Balevičius ◽  
A. Gelzinis ◽  
D. Abramavicius ◽  
T. Mančal ◽  
L. Valkunas
Keyword(s):  
Excitation Dynamics

Excitation dynamics in α-sexithiophene single crystals and UHV-grown films

1998 ◽  
Vol 76-77 ◽  
pp. 416-419 ◽  
Author(s):  
M. Hopmeier ◽  
R.N. Marks ◽  
R. Michel ◽  
M. Muccini ◽  
M. Murgia ◽  
...  
Keyword(s):  
Single Crystals ◽  
Excitation Dynamics
Sign in / Sign up

Export Citation Format

Share Document