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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

RADIATION TRANSPORT IN DISORDERED MEDIA COMPOSED OF DUAL DIPOLAR NANOPARTICLES

B. X. Wang
Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai, 200240, China

Changying Zhao
Research Center of New Energy and Energy Storage, China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 200240, China; Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai 200240, China

W. B. Zhang
Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai, 200240, China

DOI: 10.1615/IHTC16.mpe.022390
pages 5969-5980


KEY WORDS: Nano/Micro scale measurement and simulation, Photon, phonon and electron transport, random media, aysmmetry factor, Multiple scattering, Anderson localization, Quasicrystalline approximation

Abstract

Understanding as well as engineering radiative transfer in random media like micro/nanoporous materials and particulate media, allows people to manipulate the scattering and transport of thermal radiation, opening new possibilities in applications such as imaging through random media, photovoltaics and radiative cooling. A strongly backscattering phase function, i.e., a negative scattering asymmetry parameter g is of great interest to achieve unusual radiative transport phenomena, e.g., anomalous diffusion and Anderson localization of radiation. Here we realize a strongly negative scattering asymmetry factor (g ~ − 0.5) for a medium composed of randomly distributed silicon nanoparticles in the visible region, by utilizing the structural correlations and the second Kerker condition. We demonstrate that as concentration of scattering particles rises, the backscattering is also enhanced. Based on the quasicrystalline approximation (QCA), dependent scattering effects, including the modification of electric and magnetic dipole excitations and far-field interference effect, both induced by the structure correlation, are explored. Our results have profound implications in understanding and harnessing micro/nanoscale radiative transfer, paving a way to manipulate light scattering and opening new possibilities in applications such as imaging, photovoltaics and radiative cooling through random media.

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