Shot noise is the main reason Fourier Transform Spectrometry has never been popular for UV and visible light spectrometry.
32.
Vacuum tubes have shot noise because the electrons randomly leave the cathode and arrive at the anode ( plate ).
33.
The concept of shot noise was first introduced in 1918 by Walter Schottky who studied fluctuations of current in vacuum tubes.
34.
For 10 nm design rules, a lower dose leads to extremely high sensitivity, which is prohibitive with shot noise.
35.
The current is a flow of discrete charges, and the fluctuation in the arrivals of those charges creates shot noise.
36.
Thermal noise is a different physical effect that superimposes on the shot noise, contributing to the experimentally-measured value.
37.
Frequently, input phase noise with a power amplitude of one photon per mode is employed, corresponding to shot noise.
38.
Quantization adds shot noise in low-light situations, but aside from that, imaging is governed by Maxwell's equations.
39.
Now with this small current viewed on this time scale, the shot noise amounts to 1 / 10 of the DC current itself.
40.
Shot noise is distinct from voltage and current fluctuations expected in thermal equilibrium; this occurs without any applied DC voltage or current flowing.
