Recent advances in STED and RESOLFT super-resolution imaging techniques

Area of Science:

• Optical microscopy
• Super-resolution imaging
• Nanotechnology

Background:

• Far-field optical microscopy is limited by the diffraction limit.
• Stimulated emission depletion (STED) and reversible saturable optical fluorescence transition (RESOLFT) microscopy overcome diffraction limits.
• These techniques enable nanoscale spatial resolution for advanced research.

Purpose of the Study:

• To review recent advancements in STED and RESOLFT nanoscopy using continuous wave (CW) laser sources.
• To discuss limitations of STED microscopy, including high depletion beam power and photobleaching.
• To explore RESOLFT microscopy as an alternative to overcome STED limitations and investigate Bessel/Gaussian-Bessel beam STED for deep imaging.

Main Methods:

• Review of recent advancements in STED and RESOLFT nanoscopy.
• Analysis of CW laser sources in super-resolution microscopy.
• Discussion of Bessel and Gaussian-Bessel beam STED techniques for deep imaging.

Main Results:

• STED and RESOLFT microscopy achieve nanoscale resolution, surpassing the diffraction limit.
• Recent advancements focus on CW laser sources for enhanced nanoscopy.
• Bessel and Gaussian-Bessel beam STED offer potential for deep imaging and faster scanning.

Conclusions:

• STED and RESOLFT microscopy are powerful tools for nanoscale imaging in biomedical and nanophosphor research.
• RESOLFT microscopy presents a viable alternative to STED, addressing its limitations.
• Investigating organic molecules and fluorescent nanoparticles like ZnSe:Mn is feasible with RESOLFT microscopy.