Time-Correlated Single Photon Counting - Hybrid Photodetector

Time-correlated single photon counting (TCSPC) with a hybrid photodetector (HPD) is a highly sensitive technique to measure the time-resolved properties of light emissions from a sample.

This method involves detecting individual photons and precisely time-correlating them to a reference signal, allowing for the construction of detailed temporal profiles of the luminescence at a given wavelength. The hybrid photodetector, which combines the advantages of photomultiplier tubes (PMTs) and solid-state detectors, offers high quantum efficiency and fast response times. This setup is tailored to investigate the lifetimes of excited states, recombination dynamics, and other time-dependent phenomena at the nanoscale, providing a deep understanding of the material's optical and electronic properties.

Une image contenant texte, capture d’écran, Caractère coloréDescription générée automatiquement — SE image of InGaN/GaN core-shell microrod and corresponding CL intensity mapping of QW emission, integrated within the spectral window from 2.6 to 3.15 eV, at 4, 100, and 300 K.

‍

CL decays of QW emissions at the different positions along single InGaN/GaN core-shell microrod at (a) 4, (b) 100, and (c) 300 K, respectively. (LIU, W., MOUNIR, C., ROSSBACH, G., *et al.* Spatially dependent carrier dynamics in single InGaN/GaN core-shell microrod by time-resolved cathodoluminescence. *Applied Physics Letters*, 2018, vol. 112, no 5.)

‍

Typical HPDs have spectral sensitivity in the UV-visible part of the spectrum, but alternative detectors can extend the wavelength range covered well into the IR (up to 2 µm for superconducting nanowire detectors).

‍