Fractal morphology of black carbon aerosol enhances absorption in the thermal infrared wavelengths | Zendy

William R. Heinson | Zendy; Rajan K. Chakrabarty | Zendy

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Fractal morphology of black carbon aerosol enhances absorption in the thermal infrared wavelengths

Author(s) -

William R. Heinson,

Rajan K. Chakrabarty

Publication year - 2016

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.41.000808

Subject(s) - optics , absorption (acoustics) , rayleigh scattering , wavelength , carbon black , infrared , materials science , thermal , mie scattering , refractive index , fractal , aerosol , phase (matter) , carbon fibers , molecular physics , physics , scattering , light scattering , thermodynamics , meteorology , mathematical analysis , natural rubber , mathematics , quantum mechanics , composite material , composite number

In this Letter, we numerically calculate the mass absorption cross sections (MACs) of black carbon fractal aggregates in the thermal infrared solar spectrum. Compared to equivalent-size spheres, the MAC values of aggregates show a percent enhancement of ≈150 and 400 at small and large length scales, respectively. The absorption properties of aggregates with size parameters >1 surprisingly continued to remain in the Rayleigh optics regime. We explain this phenomenon using the Maxwell-Garnett effective medium theory and the concept of phase shift parameter.

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