Dual-probe photothermal microscopy for suppression of side-lobe artifacts

Area of Science:

• Biomedical Optics
• Microscopy Techniques
• Nanotechnology Imaging

Background:

• Photothermal microscopy offers high sensitivity for imaging light-absorbing molecules.
• Conventional methods face axial side-lobe artifacts, hindering precise 3D structural analysis.
• Artifacts limit the accuracy and resolution of current photothermal imaging.

Purpose of the Study:

• To develop an advanced photothermal microscopy technique for artifact suppression.
• To enhance the accuracy of three-dimensional structural imaging.
• To overcome limitations of conventional photothermal microscopy.

Main Methods:

• Implementation of a dual-probe approach with probes at distinct axial positions.
• Utilizing polarization-space-division balanced detection to mitigate artifacts.
• Experimental validation using gold nanoparticles and biological specimens (cedar pollen).

Main Results:

• Achieved a significant reduction in the side-lobe-to-main-lobe ratio from 0.18 to 0.032.
• Demonstrated substantial suppression of spurious signals in cross-sectional imaging.
• Verified artifact reduction without compromising probe power.

Conclusions:

• The dual-probe photothermal microscopy effectively suppresses axial side-lobe artifacts.
• This method enables more precise three-dimensional structural analysis of light-absorbing materials.
• The technique is suitable for dynamic specimens, expanding photothermal microscopy applications.