Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 6183-6189 |
| Number of pages | 6 |
| Journal | Applied Optics |
| Volume | 47 |
| Issue number | 33 |
| DOIs | |
| Publication status | Published - 13 Nov 2008 |
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