Graphene-based, mid-infrared, room-temperature pyroelectric bolometers   with ultrahigh temperature coefficient of resistance
  Graphene is ideally suited for photonic and optoelectronic applications, with a variety of photodetectors (PDs) in the visible, near-infrared (NIR), and THz reported to date, as well as thermal detectors in the mid-infrared (MIR). Here, we present a room temperature-MIR-PD where the pyroelectric response of a LiNbO3 crystal is transduced with high gain (up to 200) into resistivity modulation for graphene, leading to a temperature coefficient of resistance up to 900%/K, two orders of magnitude higher than the state of the art, for a device area of 300x300um2. This is achieved by fabricating a floating metallic structure that concentrates the charge generated by the pyroelectric substrate on the top-gate capacitor of the graphene channel. This allows us to resolve temperature variations down to 15umK at 1 Hz, paving the way for a new generation of detectors for MIR imaging and spectroscopy 
U. Sassi, R. Parret, S. Nanot, M. Bruna, S. Borini, S. Milana, D. De   Fazio, Z. Zhuang, E. Lidorikis, F. H. L. Koppens, A. ...
physics.ins-det cond-mat.mes-hall