Figure 2: Optical response characterization of the CAGE sensor.
From: Imaging electric field dynamics with graphene optoelectronics
(a) Gate-dependent optical reflectivity of the TE-polarized collimated 1.55 μm beam incident at the waveguide resonance angle. The dip in the optical signal corresponds to the critical coupling condition. The grey dashed line shows the optical response expected from simulation (see text and Supplementary Note 2 for details). (b) CAGE sensor voltage sensitivity, (ΔR/R)/ΔV, is derived from a for both experiment (red) and simulation (grey dashed line). We observe a maximum voltage sensitivity of 1.2% optical change per mV at Vg=+0.53 V.
