Summary: Measurement and plot of shot-noise-intercept-current for MC REFL PD.
Motivation:It is to measure the shot noise intercept current for MC REFL PD.
Result: The final plot is attached here. The plot suggests that the value of shot-noise-intercept current is 1.9mA
The plot is for the measured data of Noise voltage (V/sqrt(Hz)) vs DCcurrent(A). The fitted plot to this measured data follows the noise equation
Vnoise = gdet* sqrt[ 2e (iDC+idet)] , where gdet= transimpedance of the PD in RF region ~600
To get an approximate idea of the shot noise intercept current, we may follow the same procedure described in 7946
In the present case minimum noise value is 1.46e-08 V/sqrt(Hz)
Therefore dark current(in2) ~dark noise voltage/RF transimpedance ~25pA/sqrt(Hz)
Therefore the approximate shot noise intercept current value is (25/18)^2 ~ 1.92mA, which matches well to the fitted value.