  Thermal or temperature management in modern machines has drawn great
attentions in the last decades. The waste heat caused during the machine
operation is particularly pernicious for the temperature-dependent electronics
and may reduce the apparatus performance and lifetime. To control the operation
temperature while maintaining high input powers is often a dilemma. Enormous
works have been done for the purpose. Here, a passive temperature management
method based on near-field heat transfer is introduced, utilizing
graphene-plasmon enhanced evanescence wave tunneling. Within a pump power
tolerance range of 0.5-7 KW m-2, the device can automatically regulate its
thermal emissivity to quickly acquire thermal homeostasis around a designed
temperature. It is compact, fully passive and could be incorporated into chip
design. The results pave a promising way for passive thermal management that
could be used in modern instruments in particular for vacuum environmental
applications.
