Optical gating in photodetector for femtosecond time-resolved imaging

Date

2025-12-01

Author

Kadan, Viktor
Dmytruk, Andriy
Bondar, Mykhailo
Dmytruk, Igor
Goodarzi, Arian
Akhtaryarazar, Darya
Pavlov, Ihor

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

166
views

0
downloads

Cite This

Non-degenerate two-photon femtosecond gating directly within a photosensor has been investigated in both external and internal photoeffect configurations, with the aim of enabling fast time-resolved imaging applications. This method of gating eliminates the need for the bulky and alignment-sensitive conventional setup that requires separate elements for gating and sensing. For a K2CsSb photocathode, the energy conditions of the participating photons have been established, and the method's time resolution and sensitivity have been quantitatively evaluated. For the first time, the use of non-degenerate two-photon absorption in a multi-pixel CMOS sensor for ballistic imaging through a scattering medium—without mechanical scanning—has been experimentally demonstrated, revealing a significant improvement in image contrast over conventional single-photon imaging.

Subject Keywords

Ballistic photon imaging, Femtosecond laser, Time-resolved imaging, Two-photon absorption, Two-photon photoelectric effect, Ultrafast optical gating

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105018055424&origin=inward
https://hdl.handle.net/11511/116496

Collections

Department of Physics, Article