Subnanometric stabilization of plasmon-enhanced optical microscopy

Area of Science:

• Optics
• Nanotechnology
• Materials Science

Background:

• Tip-enhanced optical microscopy (TEOM) is crucial for nanoscale imaging.
• Thermal drift and mechanical forces limit TEOM precision.
• Real-time compensation is needed for robust nanoscale measurements.

Purpose of the Study:

• To demonstrate subnanometric stabilization of TEOM under ambient conditions.
• To enable high-precision, long-term measurements in nanoscale imaging.
• To adapt the stabilization technique for atomic force microscopy (AFM)-based nanoindentation.

Main Methods:

• Optically sensing and compensating for time-dependent thermal drift of a plasmonic metallic tip at the subnanometer scale.
• In situ compensation of mechanically induced tip displacement due to varying applied forces.
• Developing a real-time feedback system for stabilization.

Main Results:

• Achieved subnanometric stabilization of the TEOM tip under ambient conditions.
• Demonstrated real-time compensation for both thermal drift and mechanical displacement.
• Enabled long-time, robust measurements without optical signal degradation.

Conclusions:

• Subnanometric stabilization of TEOM is feasible under ambient conditions.
• The technique provides true nanometric optical imaging with high reproducibility and precision.
• The method is applicable to AFM-based nanoindentation, offering subnanometric precision.