| Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 17, Number 1, 2021
|
|
|---|---|---|
| Article Number | 20 | |
| Number of page(s) | 8 | |
| DOI | https://doi.org/10.1186/s41476-021-00167-6 | |
| Published online | 18 September 2021 | |
Research
Methodology of optimisation for a nanostructured two-photon absorption photodetector
1
DOTA, ONERA, Université Paris-Saclay, 91123, Palaiseau, France
2
École Polytechnique, Département de Physique, 91128, Palaiseau, France
Received:
7
May
2021
Accepted:
7
July
2021
We introduce a 3-step method to optimise a nanostructured photodetector for infrared sensing through non degenerated two-photon absorption (NDTPA). First, the nanostructure is designed to tailor the distribution and concentration of both pump and signal intensities within the absorbing layer, thus leading to a gain in two-photon absorption. Second, the issue of the competition between NDTPA and other sub-bandgap transitions is tackled with a new figure of merit to favor as much as possible NDTPA while minimising other absorption processes. Third, a refined computation of the gain and the figure of merit is done to consider focused beams. Finally, two scenarios based on low power infrared photodetection are investigated to illustrate the flexibility and adaptibility of the method. It is shown that the gain is up to 7 times higher and the figure of merit is up to 20 times higher compared to the literature.
Key words: Two-photon absorption / Nanostructures / Infrared photodetection
Supplementary Information The online version contains supplementary material available at (https://doi.org/10.1186/s41476-021-00167-6).
© The Author(s) 2021
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