Near-field thermal radiation between GaAs nanowires under magnetic field

We numerically investigate the near-field radiative heat transfer (NFRHT) between magneto-optical GaAs nanowires using both the local effective medium theory and fluctuational dissipation theorem. Under the action of magnetic field, the atoms or ions within magneto-optical materials will produce magnetic induction phenomenon, resulting in the orderly arrangement of the magnetic moment in NFRHT, which have not been paid enough attention. NFRHT between two aligned GaAs nanowires and plates under different magnetic field intensities is demonstrated, in which the Lorentz–Drude equations of dielectric constant tensor are proposed to describe the dielectric constant as a magnetic field applied on the GaAs nanowires. Moreover, we evaluate the near-field radiation between GaAs nanowires/plates with different filling ratios and gap distance under extent magnetic field. Furthermore, the electric field intensity is also presented for understanding light coupling, propagation, and absorption nature of GaAs grating under variable incidence angles and magnetic field strengths. The relative study is useful to the thermal radiative design in optical instruments.