Highly efficient near-field thermal rectification between InSb and graphene-coated SiO2

Graphene-based enhancement of near-field radiative-heat-transfer rectification

“…By studying the dependence on the separation distance and the graphene chemical potential along with the flux spectral features, we highlight the crucial role played by graphene plasmons in the increased coupling between the two films. The main difference between our results and previous works 31,34,35 focusing on graphene is both the simultaneous use of two graphene sheets and the optimization of the chemical potentials for any separation distance, allowing us to maximize the coupling between dissimilar materials exchanging heat in the near field. Moreover, we highlight a non-monotonic behavior of the efficiency enchancement ascribed to a transition in the power-law behavior of RHT.…”

“…The sensitivity of the rectification coefficient to a variety of as-pects, such as film thickness 27,29,39 , doping 18 , dielectric coating 20 , gratings 28,32,33,42,43 has been explored. Concerning the choice of materials, while phase-transition materials 19,23,24,26,28,31,32,39,42,43,[45][46][47] such as vanadium dioxide (VO 2 ) have gathered a remarkable attention, also superconductors 30,40 and graphene-based systems 31,34,35 have been investigated. While it is often difficult to compare different near-field rectification schemes due to strongly different geometrical and physical features (see Ref.…”

High-Efficient Photonic Thermal Rectification with Magnetocontrollability

“…The temperature-dependent carrier mobility μ (T ) and free carries of density n (T ) are obtained from. 8,21 As we shall show, the introduction of the temperature-dependent material parameters in magnetooptical permittivity tensor provides us the necessary conditions for thermal rectification.…”

“…The two-sphere system shows a stark contrast to the planar structure whose rectification factor severely decreases with the increasing of gap distance. 2,8 When d is larger than 5 μm, the contribution of m = +1 mode to transmission decreases and that of m = -1 mode increases, leading to the obvious change in the rectification curves. This robustness with the distance is quite helpful for us to design the efficient photonic thermal diodes.…”

“…2 Later, similar geometries involving various materials are carried out to improve the efficiency of thermal rectification, such as SiC and SiO 2 plates, 6 intrinsic Si plate and doped Si grating, 7 SiO 2 and InSb coated with graphene. 8 Moreover, radiative thermal diodes were proposed thanks to the phase transitions of VO 2 materials. [9][10][11] On the other hand, much stronger rectification contrasts in thermal radiation in the two-sphere geometry were also investigated.…”