Picosecond x-ray sensor

Stephen M. Durbm, Aamer Mahmood

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


A coplanar stripline detector has been developed for picosecond resolution of x-ray synchrotron pulses. When triggered by synchronized 100 fs laser pulses, this detector measures the x-ray pulse waveform with 1 ps resolution, a 100-fold improvement compared to standard pump-probe experiments at synchrotron sources. The detectors have been fabricated with CMOS compatible microfabrication processes. Time resolution is limited by photocarrier lifetimes, which is typically hundreds of picoseconds in semi-insulating GaAs. Standard implantation techniques, which add defects that serve as trapping sites to produce subpicosecond lifetimes, are insufficient because of the large x-ray absorption depths. Instead, 8 MeV protons that penetrate hundreds of microns are implanted. Strong signals have been measured using focused monochromatic x-ray beams at the Advanced Photon Source (Argonne, IL, USA). Laboratory excitation with 100 fs laser pulses, instead of x-rays, demonstrates the feasibility of this detector. The 1 ps target time resolution allows for x-ray studies in a crucial time regime where laser-induced electronic excitations transfer energy to the atomic lattice.

Original languageEnglish
Title of host publicationIEEE SENSORS 2012 - Proceedings
Publication statusPublished - 1 Dec 2012
Event11th IEEE SENSORS 2012 Conference - Taipei, Taiwan, Province of China
Duration: 28 Oct 201231 Oct 2012

Publication series

NameProceedings of IEEE Sensors


Other11th IEEE SENSORS 2012 Conference
CountryTaiwan, Province of China



  • coplanar strip lines
  • pump-probe
  • synchrotron
  • x-ray

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Durbm, S. M., & Mahmood, A. (2012). Picosecond x-ray sensor. In IEEE SENSORS 2012 - Proceedings [6411492] (Proceedings of IEEE Sensors). https://doi.org/10.1109/ICSENS.2012.6411492