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Active cooling of single-photon avalanche diode (SPAD) array detectors significantly reduces dark noise, enhancing performance in fluorescence microscopy. This advancement improves signal-to-noise ratio and reduces laser power needs for super-resolution imaging and spectroscopy.

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Area of Science:

  • Optics and Photonics
  • Microscopy Technology
  • Biophotonics

Background:

  • Single-photon avalanche diode (SPAD) array detectors offer advanced capabilities for fluorescence (lifetime) laser scanning microscopy (FLSM).
  • Optimizing SPAD detector characteristics like dark noise and photon-detection efficiency involves trade-offs, limiting FLSM technique performance.
  • Existing FLSM techniques, including super-resolution imaging and fluorescence fluctuation spectroscopy, are constrained by detector performance limitations.

Purpose of the Study:

  • To introduce a novel SPAD array detector with an active cooling system to mitigate performance trade-offs.
  • To substantially reduce dark noise in SPAD detectors without negatively impacting other critical characteristics.
  • To enhance the applicability and performance of FLSM techniques through improved detector design.

Main Methods:

  • Implementation of an active cooling system integrated with a novel SPAD array detector.
  • Temperature reduction of the sensor to -15°C to assess its impact on detector performance.
  • Evaluation of detector characteristics including dark count rate, signal/noise ratio, and performance in imaging and spectroscopy applications.

Main Results:

  • Cooling the SPAD sensor to -15°C resulted in a 10-fold decrease in dark count rate, significantly improving the signal/noise ratio.
  • Reduced laser power (by over threefold) is achievable for imaging, benefiting live-cell super-resolution applications.
  • Cooling eliminated artifacts in fluorescence fluctuation spectroscopy correlation functions, such as spurious negative correlations.

Conclusions:

  • The novel actively cooled SPAD array detector substantially reduces dark noise, enhancing signal/noise ratio and enabling lower laser power for FLSM.
  • This technology is particularly advantageous for live-cell super-resolution imaging and corrects artifacts in fluorescence fluctuation spectroscopy.
  • The developed detector represents a significant advancement for integrating SPAD arrays into various FLSM systems.