Fig. 3
From: Graphene mechanical pixels for Interferometric Modulator Displays
Stroboscopic measurement. a Optical microscope image of a 15 μm in diameter drum at two opposite phases of vibration (ϕ = 0 top, ϕ = π bottom) while actuated at 1 kHz. b Color map of the reflectance at the center of the same drum as a function of frequency and phase. A phase delay intrinsic to the signal amplifier is observed. c Bode plots of amplitude and phase of the drum, showing that the response is flat up to 400 Hz (cut-off frequency of amplifier)
