Time-zoomable FRET Spectroscopy with a 512 x16 SPAD Line Sensor

Ahmet Erdogan, Gareth Williams, Andrea Usai, Nikola Krstajic, Neil Finlayson, andrew beavil, Rebecca Beavil, Robert Henderson

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

Abstract / Description of output

We demonstrate a new 512x16 single photon avalanche diode (SPAD) based line sensor with per-pixel TCSPC histogramming for time-resolved, time-zoomable, FRET spectroscopy. The line sensor can operate in single photon counting (SPC) mode as well as time-correlated single photon counting (TCSPC) and per-pixel histogramming modes. TCSPC has been the preferred method for fluorescence lifetime measurements due to its collection of full decays as a histogram of arrival times. However, TCSPC is slow due to only capturing one photon per exposure and large timestamp data transfer requirements for offline histogramming. On-chip histogramming improves the data rate by allowing multiple SPAD pulses (up to one pulse per laser period) to be processed in each exposure cycle, along with secondly reducing the I/O bottleneck as only the final histogram is transferred. This can enable 50x higher acquisition rates (up to 10 billion counts per second), along with time-zoomable histogramming operation from 1.6ns to 205ns with 50ps resolution. A broad spectral range can be interrogated with the sensor (450-900nm). Overall, these sensors provide a unique combination of light sensing capabilities for use in high speed, sensitive, optical instrumentation in the time/wavelength domain. We test the sensor performance by observation of fluorescence resonance energy transfer (FRET) between FAM and TAMRA and between EGFP and RFP FRET standards.
Original languageEnglish
Title of host publicationPROCEEDINGS VOLUME 10504 Biophysics, Biology and Biophotonics III
Subtitle of host publicationthe Crossroads
Number of pages9
Publication statusE-pub ahead of print - 20 Feb 2018
EventPhotonics West 2018: BiOS - Moscone Centre, San Franisco, United States
Duration: 27 Jan 20181 Feb 2018


ConferencePhotonics West 2018
Country/TerritoryUnited States
CitySan Franisco
Internet address


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