Photon-by-photon determination of emission bursts from diffusing single chromophores

Area of Science:

• Physical Chemistry
• Nanotechnology
• Spectroscopy

Background:

• Single-molecule experiments face challenges in distinguishing signals from photon-counting noise.
• Current methods often involve binning and thresholding, which can introduce parameter selection uncertainties.
• Efficiently harvesting information-rich regions in noisy data is crucial for accurate analysis.

Purpose of the Study:

• To develop a novel photon-by-photon procedure for analyzing diffusion-type single-molecule experiments.
• To overcome the limitations associated with traditional binning and thresholding parameters.
• To provide a more reliable and efficient method for detecting and harvesting photon bursts.

Main Methods:

• A new data analysis procedure operating on individual photons was developed.
• The method was validated by detecting two-photon emission bursts from diffusing single gold nanoparticles.
• The procedure eliminates the need for arbitrary binning and threshold parameter choices.

Main Results:

• The photon-by-photon procedure successfully detected photon bursts from diffusing gold nanoparticles.
• The results demonstrated the reliability and efficiency of the new burst-finding method.
• The approach effectively harvests information from diffusion experiments without parameter uncertainties.

Conclusions:

• The introduced photon-by-photon procedure offers a robust alternative to conventional analysis techniques.
• This method enhances the accuracy and efficiency of signal detection in diffusion-based single-molecule studies.
• The findings support the utility of this procedure for harvesting photon bursts in complex experimental data.