scholarly journals Determining the extinction cross section of aggregating fish

1992 ◽  
Vol 91 (4) ◽  
pp. 1983-1989 ◽  
Author(s):  
Kenneth G. Foote ◽  
Egil Ona ◽  
Reidar Toresen
Keyword(s):  
Cross Section ◽  
Extinction Cross Section

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.

Extinction cross section of a dielectric strip

1988 ◽  
Vol 36 (5) ◽  
pp. 696-706 ◽  
Author(s):  
S. Dowerah ◽  
A. Chakrabarti
Keyword(s):  
Cross Section ◽  
Extinction Cross Section

scholarly journals Simulated Optical Properties of Gold Nanocubes and Nanobars by Discrete Dipole Approximation

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Mohammed Alsawafta ◽  
Mamoun Wahbeh ◽  
Vo-Van Truong
Keyword(s):  
Absorption Spectrum ◽  
Cross Section ◽  
Longitudinal Mode ◽  
Transverse Mode ◽  
Dipole Approximation ◽  
Discrete Dipole Approximation ◽  
Absorption Cross ◽  
Extinction Cross Section ◽  
Band Position ◽  
Mode Tm

The absorption spectra for a gold nanocube and for a gold nanobar are calculated by using the Discrete Dipole Approximation (DDA). The results show the excitation of a single albeit broad surface plasmon (SP) band of the gold nanocube. The extinction cross section of the gold nanocube is dominated by the absorption cross section that gains importance as the width increases. Further increasing the nanocube size beyond 80 nm will result in an optical response mainly characterized by scattering properties. The absorption spectrum of the nanobar shows the excitation of both the longitudinal mode (LM) and the transverse mode (TM). The nanobar is also compared to a cylinder, a spherically capped cylinder, and a spheroid of the same aspect ratio. The band position of the TM of the nanobar is red-shifted as compared to the ones calculated for other morphologies, while the LM is either blue-shifted or red-shifted depending on the morphologies considered.

Polarimetric measurements of the extinction cross section

2009 ◽  
Author(s):  
Christer Larsson ◽  
Mats Gustafsson ◽  
Gerhard Kristensson
Keyword(s):  
Cross Section ◽  
Extinction Cross Section

Frequency-dependent extinction cross section of a spherical ion or metallic cluster immersed in a plasma

1995 ◽  
Vol 217 (1-2) ◽  
pp. 196-213 ◽  
Author(s):  
B.U. Felderhof ◽  
T. Beński ◽  
B. Cichocki
Keyword(s):  
Cross Section ◽  
Metallic Cluster ◽  
Frequency Dependent ◽  
Extinction Cross Section

scholarly journals Extinction cross-section of Norwegian spring-spawning herring

1999 ◽  
Vol 56 (5) ◽  
pp. 606-612 ◽  
Author(s):  
K Foote
Keyword(s):  
Cross Section ◽  
Extinction Cross Section
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