Interferometric Scattering Microscopy: Seeing Single Nanoparticles and Molecules via Rayleigh Scattering

Area of Science:

• Optics and Photonics
• Nanotechnology
• Biophysics

Background:

• Fluorescence microscopy faces fundamental limits for nanometer-scale optical investigations.
• Growing demand for fluorescent-free imaging methods drives innovation.
• Elastic scattering is a ubiquitous optical contrast mechanism with untapped potential.

Purpose of the Study:

• To demonstrate elastic scattering's capability for sensitive nanoparticle and molecule imaging.
• To present interferometric scattering (iSCAT) microscopy as a leading fluorescent-free technique.
• To explore the theoretical foundation, experimental aspects, and applications of iSCAT.

Main Methods:

• Utilizing elastic light scattering for optical contrast.
• Implementing interferometric scattering (iSCAT) microscopy.
• Comparing iSCAT with bright-field imaging and other established microscopies.

Main Results:

• Elastic scattering enables sensitive detection and imaging of nanoscale objects.
• iSCAT achieves very high spatiotemporal resolution.
• iSCAT demonstrates broad applicability across various scientific disciplines.

Conclusions:

• iSCAT microscopy is a promising fluorescent-free imaging method.
• Elastic scattering offers significant advantages over traditional fluorescence microscopy for nanoscopic phenomena.
• iSCAT is rapidly impacting diverse fields requiring high-resolution imaging.