Enhanced backscattering of polarized light: Effect of particle nonsphericity on the helicity-preserving enhancement factor |
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Authors: | Janna M Dlugach Michael I Mishchenko |
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Institution: | aMain Astronomical Observatory of the National Academy of Sciences of Ukraine, 27 Zabolotny Str., 03680 Kyiv, Ukraine bNASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA |
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Abstract: | We analyze theoretically the effect of particle nonsphericity on the backscattering enhancement factor ζhp in the helicity-preserving channel. Using numerically exact T-matrix and vector radiative-transfer codes, we have performed computations for optically semi-infinite homogeneous layers composed of polydisperse, randomly oriented oblate spheroids with the real part of the refractive index equal to 1.2, 1.4, and 1.6, the imaginary part of the refractive index equal to 0 and 0.01, various values of the equal-surface-area-sphere effective size parameter, and aspect ratios 1![less-than-or-equals, slant less-than-or-equals, slant](http://www.sciencedirect.com/scidirimg/entities/2a7d.gif) ![var epsilon var epsilon](http://www.sciencedirect.com/scidirimg/entities/25b.gif) 2. Our computations demonstrate that whereas for spheres ζhp≡2, for spheroids the helicity-preserving enhancement factor can deviate quite significantly from the value 2. The magnitude of this deviation varies substantially with particle microphysical parameters and illumination geometry. |
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Keywords: | Enhancement factor Coherent backscattering Polarization Nonspherical particles |
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