Fig. 5: Speed of response.
From: Guidelines for accurate evaluation of photodetectors based on emerging semiconductor technologies
a, Response to a rectangular optical pulse, alongside the illustration of rise and fall times. b, Response to a rectangular optical pulse with non-monotonic transients. c, Although shorter pulses may suggest that steady state is nearly reached, verification of the responsivity under illumination reveals a non-ideal transient. d, Example of incorrect extraction of rise and fall times for optical pulses that do not allow steady state to be reached. e, Response to an optical impulse. f, Bode plot of the responsivity of a photodetector behaving as an ideal linear first-order system under sinusoidally modulated light. ZL, load impedance; PD, photodetector.
