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Graphene is a promising candidate for building fast and ultra-sensitivebolometric detectors due to its weak electron-phonon coupling and low heatcapacity. In order to realize a practical graphene-based bolometer, severalimportant issues, including the nature of radiation response, couplingefficiency to the radiation and the thermal conductance need to be carefullystudied. Addressing these issues, we present graphene-superconductor junctionsas a viable option to achieve efficient and sensitive bolometers, with thesuperconductor contacts serving as hot electron barriers. For agraphene-superconductor device with highly transparent interfaces, theresistance readout in the presence of radio frequency radiation is dominated bynon-linear response. On the other hand, a graphene-superconductor tunnel deviceshows dominantly bolometric response to radiation. For graphene devicesfabricated on $SiO_{2}$ substrates, we confirm recent theoretical predictionsof $T^{2}$ temperature dependence of phonon thermal conductance in the presenceof disorder in the graphene channel at low temperatures.

Nonlinear vs. bolometric radiation response and phonon thermal conductance in graphene-superconductor junctions