Figure 7
Reflectance and responsivity of graphene (a–c) and h-BN (d–f) devices with λ = 633 nm. (a,d) Reflectance (top) and responsivity (bottom) as functions of vacuum gap depth (d2) for 1L to 50L graphene/h-BN devices. Curves for selected thicknesses are color highlighted (as indicated in legends). The vertical scales are the same as in Fig. 5a,b for easy comparison. (b,e) 2D color plots of reflectance R and (c,f) magnitude of responsivity |ℜ| as functions of device thickness (d1) and vacuum gap depth (d2) for 1L to 200L graphene and h-BN devices (in R maps: dark purple: low R; dark red: high R; in |ℜ| maps: dark purple: no responsivity; dark red: high |ℜ|). Dotted curves represent the responsivity peaks. Locations with d2 = nλ/2 are shown as gridlines.
