Infrared nanoscopy for subcellular chemical imaging

Area of Science:

• Spectroscopy and Microscopy
• Nanotechnology
• Chemical Imaging

Background:

• Infrared (IR) nanoscopy combines vibrational spectroscopy with near-field optics for nanoscale chemical analysis.
• It overcomes the classical diffraction limit, achieving nanometer-scale spatial resolution.
• Atomic force microscopy probes detect light-matter interactions in the optical near field.

Purpose of the Study:

• To review recent biological applications of IR nanoscopy techniques.
• To highlight technical advancements and machine learning integration.
• To emphasize the potential of label-free IR nanoscopy in biology.

Main Methods:

• Scattering-type scanning near-field optical microscopy (s-SNOM)
• Nanoscale Fourier-transform infrared spectroscopy (nano-FTIR)
• Utilizing atomic force microscopy probes for near-field detection

Main Results:

• Demonstrated ability to resolve subcellular ultrastructure in various cell types.
• Enabled study of biological processes like single-cell metabolic activity.
• Showcased technical improvements and machine learning for data analysis.

Conclusions:

• Label-free IR nanoscopy provides high-resolution chemical information at the nanoscale.
• It is a powerful tool for investigating complex biological systems.
• Emerging machine learning approaches promise to further expand its capabilities.