Abstract
The SiC micro/nano-scale structure has advantages for enhancing nonreciprocal absorptance for photovoltaic use due to the magneto optical effect. In this work, we demonstrate the near-field radiative transfer between two aligned SiC nanowires/plates under different magnetic field intensities, in which Lorentz-Drude equations of the dielectric constant tensor are proposed to describe the dielectric constant as a magnetic field applied on the SiC structure. The magnetic field strength is qualified in this study. Using local effective medium theory and the fluctuation-dissipation theorem, we evaluate the near-field radiation between SiC nanowires with different filling ratios and gap distances under an external magnetic field. Compared to the near-field heat flux between two SiC plates, the one between SiC nanowires can be enhanced with magnetic field intensity, a high filling ratio, and a small gap distance. The electric field intensity is also presented for understanding light coupling, propagation, and absorption nature of SiC grating under variable incidence angles and magnetic field strengths. This relative study is useful for thermal radiative design in optical instruments.
Highlights
When the distance between two materials is less than the thermal characteristic wavelength, known as the characteristic wavelength of thermal radiation, evanescent waves play a dominant role in radiative heat transfer
We theoretically calculate the near field radiative transfer based on SiC nanowires with different filling ratios and gap distances under an external magnetic field by using fluctuation-dissipation theorem and local effective medium theory (EMT), in which Lorentz-Drude equations of dielectric constant tensor are proposed to describe the dielectric constant as a magnetic field is applied toon the SiC
Compared to SiC plates, the transmission of SiC nanowires was higher at very large lateral wavevector values and in the hyperbolic band
Summary
When the distance between two materials is less than the thermal characteristic wavelength, known as the characteristic wavelength of thermal radiation, evanescent waves play a dominant role in radiative heat transfer. Under the action of a magnetic field, the atoms, or ions within the intrinsic magnetic moment material, produce magnetic induction phenomenon, resulting in the orderly arrangement of the magnetic moment, which affects the transmission of light in its internal features, called the magneto-optical effect. The presented MPs greatly affected the spectral heat flux beside the SPhPs. the above works all focused on near-field radiative transfer for reciprocal materials, lacking studies on effect of non-reciprocal materials as magneto-optical materials. We theoretically calculate the near field radiative transfer based on SiC nanowires with different filling ratios and gap distances under an external magnetic field by using fluctuation-dissipation theorem and local effective medium theory (EMT), in which Lorentz-Drude equations of dielectric constant tensor are proposed to describe the dielectric constant as a magnetic field is applied toon the SiC.
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