Evaluation of a fast single-photon avalanche photodiode for measurement of early transmitted photons through diffusive media.
We tested the performance of a fast single-photon avalanche photodiode (SPAD) in measurement of early transmitted photons through diffusive media. In combination with a femtosecond titanium:sapphire laser, the overall instrument temporal response time was 59 ps. Using two experimental models, we showed that the SPAD allowed measurement of photon-density sensitivity functions that were approximately 65% narrower than the ungated continuous wave case at very early times. This exceeds the performance that we have previously achieved with photomultiplier-tube-based systems and approaches the theoretical maximum predicted by time-resolved Monte Carlo simulations.
Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115, USA.
Ying
Y
Mu
Niksa
N
Valim
Mark
M
Niedre
D000042:Absorption; D055615:Electrical Equipment and Supplies; D055620:Optical Phenomena; D019047:Phantoms, Imaging; D017785:Photons