Precise background subtraction in stimulated emission double depletion nanoscopy

Area of Science:

• Super-resolution microscopy
• Optical imaging techniques
• Nanoscopy

Background:

• Low-resolution background in STED nanoscopy is caused by incomplete depletion or re-excitation.
• Stimulated emission double depletion (STEDD) was developed to suppress this background.
• STEDD uses a conventional STED pulse followed by a Gaussian STED pulse to deplete fluorophores.

Purpose of the Study:

• To present a method for determining the optimal weight factor in STEDD.
• To improve background suppression in STEDD nanoscopy.
• To demonstrate the applicability of the method to other differential imaging approaches.

Main Methods:

• Determining the weight factor by direct analysis of acquired STEDD data.
• The weight factor is linked to fluorescence decay characteristics.
• Optimizing the weight factor by maximizing high-frequency spectral components in the STEDD image spectrum.

Main Results:

• A simple and effective method for determining the STEDD weight factor was developed.
• The optimal weight factor maximizes high-frequency spectral components, indicating effective background removal.
• The presented strategy is adaptable for background suppression in other imaging techniques.

Conclusions:

• The new method provides an efficient way to optimize STEDD for improved image quality.
• This approach enhances the performance of STEDD nanoscopy by precisely controlling background suppression.
• The developed strategy offers broad applicability in advanced optical imaging for noise reduction.