Colorimetry technique for scalable characterization of suspended   graphene
  Previous statistical studies on the mechanical properties of chemical-vapor-deposited (CVD) suspended graphene membranes have been performed by means of measuring individual devices or with techniques that affect the material. Here, we present a colorimetry technique as a parallel, non-invasive, and affordable way of characterizing suspended graphene devices. We exploit Newton rings interference patterns to study the deformation of a double-layer graphene drum 13.2 micrometer in diameter when a pressure step is applied. By studying the time evolution of the deformation, we find that filling the drum cavity with air is 2-5 times slower than when it is purged. 
Santiago J. Cartamil-Bueno, Peter G. Steeneken, Alba Centeno, Amaia   Zurutuza, Herre S. J. van der Zant, and Samer Houri
cond-mat.mes-hall