Abstract
| Language | English |
|---|---|
| Pages | 6183-6189 |
| Number of pages | 6 |
| Journal | Applied Optics |
| Volume | 47 |
| Issue number | 33 |
| DOIs | |
| Publication status | Published - 13 Nov 2008 |
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Keywords
- complex refractive index
- nonspherical particles
- infrared region
- Bacillus subtilis spores
- adding-doubling method
- radiative transfer equation
- single scattering theories
- t-matrix method
- rayleigh–gans–debye approximation
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Complex refractive index of non-spherical particles in the vis-NIR region - application to Bacillus Subtilis spores. / Velazco-Roa, Maria A; Dzhongova, Elitsa; Thennadil, Suresh N.
In: Applied Optics, Vol. 47, No. 33, 13.11.2008, p. 6183-6189.Research output: Contribution to journal › Article
TY - JOUR
T1 - Complex refractive index of non-spherical particles in the vis-NIR region - application to Bacillus Subtilis spores
AU - Velazco-Roa, Maria A
AU - Dzhongova, Elitsa
AU - Thennadil, Suresh N.
PY - 2008/11/13
Y1 - 2008/11/13
N2 - A method is presented for the estimation of optical constants in the ultraviolet-visible-near-infrared (UVVis-NIR) region of nonspherical particles in a suspension at concentrations where multiple scattering issignificant. The optical constants are obtained by an inversion technique using the adding-doubling method to solve the radiative transfer equation in combination with the single scattering theories for modelling scattering by nonspherical particles. Two methods for describing scattering by single scatteringare considered: the T-matrix method and the approximate but computationally simpler Rayleigh-Gans-Debye (RGD) approximation. The method is then applied to obtain the optical constants of Bacillussubtilis spores in the wavelength region 400-1200 nm. It is found that the optical constants obtained using the RGD approximation matches those obtained using the T-matrix method to within experimental error.
AB - A method is presented for the estimation of optical constants in the ultraviolet-visible-near-infrared (UVVis-NIR) region of nonspherical particles in a suspension at concentrations where multiple scattering issignificant. The optical constants are obtained by an inversion technique using the adding-doubling method to solve the radiative transfer equation in combination with the single scattering theories for modelling scattering by nonspherical particles. Two methods for describing scattering by single scatteringare considered: the T-matrix method and the approximate but computationally simpler Rayleigh-Gans-Debye (RGD) approximation. The method is then applied to obtain the optical constants of Bacillussubtilis spores in the wavelength region 400-1200 nm. It is found that the optical constants obtained using the RGD approximation matches those obtained using the T-matrix method to within experimental error.
KW - complex refractive index
KW - nonspherical particles
KW - infrared region
KW - Bacillus subtilis spores
KW - adding-doubling method
KW - radiative transfer equation
KW - single scattering theories
KW - t-matrix method
KW - rayleigh–gans–debye approximation
U2 - 10.1364/AO.47.006183
DO - 10.1364/AO.47.006183
M3 - Article
VL - 47
SP - 6183
EP - 6189
JO - Applied Optics
T2 - Applied Optics
JF - Applied Optics
SN - 1559-128X
IS - 33
ER -