Enhancement and Manipulation of Near-Field Thermal Radiation Heat Transfer in a Two-Body System Based on the Lorentz Model

In this paper, we systematically investigate the near-field radiative heat transfer in a two-body system described by the Lorentz model. Under a finite temperature difference between the upper and lower plates, we explore the evolution of radiative heat transfer by tuning the longitudinal and transverse optical phonon frequencies. Our results show that the near-field radiative heat flux can exceed the blackbody radiation limit by several orders of magnitude. Both the longitudinal and transverse phonon frequencies serve as effective control knobs, enabling broadband modulation of the spectral heat transfer. Furthermore, mirror-symmetric modulation of these phonon frequencies in both plates significantly enhances the tunability of the near-field heat transfer. The findings obtained in this study provide valuable theoretical insights and a fundamental reference framework for designing actively tunable near-field thermal devices based on similar material platforms.