21. Shot noise is produced by electrons in transit across a discontinuity, which occurs in all detectors.22. In contrast, when SNR is limited by shot noise , it improves with increasing laser power. 23. Thus shot noise is most frequently observed with small currents or low light intensities that have been amplified. 24. It interpolates between shot noise ( zero temperature ) and Nyquist-Johnson noise ( high temperature ). 25. This work would continue until the 1990s where it would cross paths with the work on shot noise . 26. Shot noise is a Poisson process and the charge carriers that make up the current follow a Poisson distribution.27. Electronic image sensors, such as CCDs, exhibit shot noise corresponding to the statistics of individual photon events. 28. With very small currents and considering shorter time scales ( thus wider bandwidths ) shot noise can be significant. 29. Image noise can also originate in film grain and in the unavoidable shot noise of an ideal photon detector. 30. EUV further suffers from the shot noise limit, which forces the dose to increase going for successive nodes.
