New photon-counting detectors for single-molecule fluorescence spectroscopy and imaging

Area of Science:

• Single-molecule fluorescence spectroscopy
• Biophysics
• Analytical Chemistry

Background:

• Solution-based single-molecule fluorescence spectroscopy offers high sensitivity.
• Current methods face challenges with long acquisition times due to low molecule concentrations.

Purpose of the Study:

• To present a general approach for parallelizing single-molecule fluorescence spectroscopy.
• To improve data acquisition speed in point-like and widefield geometries.

Main Methods:

• Utilizing a multispot excitation and detection geometry.
• Employing novel, highly-parallel detector arrays.
• Applying fluorescence correlation spectroscopy (FCS) and single-molecule fluorescence measurements.

Main Results:

• Demonstrated a general approach to parallelize single-molecule spectroscopy.
• Illustrated the potential of multispot geometry for faster data acquisition.
• Addressed challenges in widefield geometries, including background reduction and temporal resolution.

Conclusions:

• Parallelization via multispot geometry significantly speeds up single-molecule fluorescence spectroscopy.
• The presented methods enhance efficiency for FCS and single-molecule studies.
• New detector concepts are crucial for advancing widefield single-molecule measurements.