Label-free multimodal microscopy using a single light source and detector for biological imaging.

Area of Science:

• Biomedical Optics
• Microscopy
• Biophotonics

Background:

• Multimodal nonlinear microscopy offers deep tissue penetration and label-free imaging capabilities crucial for biological and medical research.
• Existing multimodal systems are often complex, bulky, and expensive due to the requirement for multiple light sources and detectors.

Purpose of the Study:

• To develop a novel, simplified multimodal nonlinear microscopy system.
• To demonstrate the capability of acquiring multiple nonlinear imaging contrasts from a single system using a single light source and detector.

Main Methods:

• The system utilizes a photonic crystal fiber, pulse picker, and multimode fibers to achieve multimodal imaging.
• The developed technique integrates two-photon excitation fluorescence (TPEF), second-harmonic generation (SHG), coherent anti-Stokes Raman scattering (CARS), and backreflection imaging.

Main Results:

• Successful acquisition of multimodal nonlinear images from swine coronary arteries.
• Demonstration of simultaneous imaging of TPEF, SHG, CARS, and backreflection signals.
• The system proved effective in capturing detailed microstructural information.

Conclusions:

• The developed single-source, single-detector system significantly simplifies multimodal nonlinear microscopy.
• This approach offers a more compact, cost-effective, and versatile platform for biomedical imaging.
• The technology holds potential for diverse applications in biology and medicine, including disease diagnosis and research.