Due to numerous other exciting properties of bilayer graphene, such as a tunable bandgap and small electron heat capacity, it has been an exciting material system to investigate as a hot-electron bolometer [12]. While the tunable band gap sets the detection wavelength, the small electron heat capacity results in significant changes in electron temperature. These carriers can either be carried across the channel, causing a photoconductive signal; or can increase the lattice temparature, and hence the resistivity[12]. This latter effect is the bolometric effect. Quantitatively, the induced voltage in these can be written as follows:

\(\Delta V=I_{dc}\Delta R=I_{dc}\frac{L}{W}\Delta\left(\frac{1}{\sigma}\right)=I_{dc}\left(\frac{W}{L}\right)R^2\Delta ne\mu\) for Photoconductive Effect

\(\Delta V=I_{dc}\Delta R=I_{dc}\frac{dR}{dT}\Delta T\) for Bolometric Effect