The investigations of near field radiative heat transfer have been extended to many-body systems for further improving the heat transfer rate. Here, we develop a general formulation for characterizing near field radiative heat transfer in three-grating systems, which can be applied in asymmetric scenarios. By introducing asymmetric modulators between thermal emitters and absorbers, we show a remarkable amplification of heat flux in three-grating systems than two-grating counterparts. Moreover, the forward and reverse scenarios in asymmetric three-grating systems provide a high flexibility of manipulation the heat transfer rate, ascribed to the difference in the coupling of evanescent modes on two sides of asymmetric modulator. The proposed formulation and the designed near field radiative heat transfer systems may pave a new avenue for further enhance and modulate heat transfer rate in many penitential applications.

近场辐射传热的研究已经扩展到多体系统，以进一步提高传热速率。在这里，我们开发了用于表征三光栅系统中近场辐射热传递的通用公式，该公式可用于非对称场景。通过在热辐射器和吸收器之间引入非对称调制器，我们显示出三光栅系统中的热通量比两光栅系统中的热通量显着放大。而且，非对称三光栅系统中的正向和反向情况为传热速率的操纵提供了很高的灵活性，这归因于非对称调制器两侧的e逝模耦合的差异。