On longitudinal radiation pressure cross-sections in the generalized Lorenz–Mie theory and their numerical relationship with the dipole theory of forces

2021 ◽  
Vol 38 (3) ◽  
pp. 825
Author(s):  
Leonardo André Ambrosio ◽  
Gérard Gouesbet
Keyword(s):  
Radiation Pressure ◽  
Cross Sections ◽  
Mie Theory

scholarly journals Measurement and modeling of the multiwavelength optical properties of uncoated flame-generated soot

2018 ◽  
Vol 18 (16) ◽  
pp. 12141-12159 ◽  
Author(s):  
Sara D. Forestieri ◽  
Taylor M. Helgestad ◽  
Andrew T. Lambe ◽  
Lindsay Renbaum-Wolff ◽  
Daniel A. Lack ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Sections ◽  
Climate Models ◽  
Complex Refractive Index ◽  
Mie Theory ◽  
Particle Diameter ◽  
Effective Theory ◽  
Soot Particles ◽  
Multiple Wavelengths ◽  
Specific Complex

Abstract. Optical properties of flame-generated black carbon (BC) containing soot particles were quantified at multiple wavelengths for particles produced using two different flames: a methane diffusion flame and an ethylene premixed flame. Measurements were made for (i) nascent soot particles, (ii) thermally denuded nascent particles, and (iii) particles that were coated and then thermally denuded, leading to the collapse of the initially lacy, fractal-like morphology. The measured mass absorption coefficients (MACs) depended on soot maturity and generation but were similar between flames for similar conditions. For mature soot, here corresponding to particles with volume-equivalent diameters >∼160 nm, the MAC and absorption Ångström exponent (AAE) values were independent of particle collapse while the single-scatter albedo increased. The MAC values for these larger particles were also size-independent. The mean MAC value at 532 nm for larger particles was 9.1±1.1 m2 g−1, about 17 % higher than that recommended by Bond and Bergstrom (2006), and the AAE was close to unity. Effective, theory-specific complex refractive index (RI) values are derived from the observations with two widely used methods: Lorenz–Mie theory and the Rayleigh–Debye–Gans (RDG) approximation. Mie theory systematically underpredicts the observed absorption cross sections at all wavelengths for larger particles (with x>0.9) independent of the complex RI used, while RDG provides good agreement. (The dimensionless size parameter x=πdp/λ, where dp is particle diameter and λ is wavelength.) Importantly, this implies that the use of Mie theory within air quality and climate models, as is common, likely leads to underpredictions in the absorption by BC, with the extent of underprediction depending on the assumed BC size distribution and complex RI used. We suggest that it is more appropriate to assume a constant, size-independent (but wavelength-specific) MAC to represent absorption by uncoated BC particles within models.

scholarly journals Study of the Optical Properties of Functionalized Gold Nanoparticles in Different Tissues and Their Correlation with the Temperature Increase

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
A. Carrillo-Cazares ◽  
N. P. Jiménez-Mancilla ◽  
M. A. Luna-Gutiérrez ◽  
K. Isaac-Olivé ◽  
M. A. Camacho-López
Keyword(s):  
Cross Sections ◽  
Temperature Increase ◽  
Mie Theory ◽  
Average Temperature ◽  
Theoretical Maximum ◽  
Maximum Value ◽  
Homogeneous Media ◽  
532 Nm ◽  
Different Tissues ◽  
Functionalized Aunps

Mie theory explains the interaction of light with a gold nanoparticle (AuNP) through the absorption (Cabs), scattering (Csca), and extinction (Cext) cross sections. These parameters have been calculated in the case of AuNPs dispersed in homogeneous media, but not for specific tissues. The aim of this research was to theoretically obtain the optical cross sections (Cabs, Csca, and Cext) of functionalized AuNPs in liver and colon tissues through Mie theory and correlate them with the temperature increase observed experimentally in tissues containing AuNPs under plasmonic photothermal irradiation using a Nd-YAG laser (λ = 532 nm). Calculations showed that Cabs represents 98.96±0.03% of Cext at 532 nm. The Cext value for a functionalized AuNP in water was 365.66 nm2 (94% of the theoretical maximum value at 522.5 nm), 404.24 nm2 in colon (98% of the theoretical maximum value at 525 nm), and 442.39 nm2 in liver (96% of the theoretical maximum value at 525 nm). Therefore, nanoparticles irradiated at 532 nm are very close to their resonance value. These results correlated with the experimental irradiation of functionalized AuNPs in different tissues, where the average temperature increase showed the pattern liver > colon > water. The temperature increase observed (ΔT up to 13°C) is sufficient to produce cellular death.

Prediction of reverse radiation pressure by generalized Lorenz–Mie theory

1996 ◽  
Vol 35 (15) ◽  
pp. 2702 ◽  
Author(s):  
K. F. Ren ◽  
G. Gréhan ◽  
G. Gouesbet
Keyword(s):  
Radiation Pressure ◽  
Mie Theory

scholarly journals Radiation pressure cross-sections of fluffy interstellar grains

2003 ◽  
Vol 341 (4) ◽  
pp. 1239-1245 ◽  
Author(s):  
R. Saija ◽  
M. A. Iati ◽  
A. Giusto ◽  
F. Borghese ◽  
P. Denti ◽  
...  
Keyword(s):  
Radiation Pressure ◽  
Cross Sections ◽  
Interstellar Grains

Planck mean radiation-pressure cross sections for nonspherical grains. I

Astrophysics ◽  
1983 ◽  
Vol 18 (4) ◽  
pp. 353-360 ◽  
Author(s):  
N. V. Voshchinnikov ◽  
V. B. Il'in
Keyword(s):  
Radiation Pressure ◽  
Cross Sections
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