A Scaling Law for SPAD Pixel Miniaturization
Round 1
Reviewer 1 Report
paper is very good and extensive review found only a few minor points - not worth mentioning
Reviewer 2 Report
This paper presents a compact study of the scaling laws of SPAD devices, analyzing properties such as the area efficiency, the photon detection probability and the energy efficiency, all of which are highly dependent of the physical dimensions of the individual pixels. It is shown through model equations and numerical plots how the physical dimensions affect each of these performance parameters, so that the design space can be systematically explored when fabricating this sort of devices.
While most of the scaling laws presented in the paper are already known from other works, the value in this manuscript comes primarily from an integrated view and analysis with regard to their joint evolution, and a small fitting exercise of experimental data to the theoretical formulas is included in the paper.
Since the manuscript is clearly presented and well organized, and since it summarizes concisely and with some insight the way that physical constraints impact on the performance of SPADs, this work is valuable and interesting to the readers in the field as a survey and tutorial presentation. Only some minor checks and corrections are necessary in the text.
