Multiphoton microscopy with near infrared contrast agents.

Area of Science:

• Biophotonics
• Microscopy
• Molecular Imaging

Background:

• Multiphoton microscopy (MPM) traditionally uses visible light, limiting available fluorescent probes.
• Existing MPM techniques face challenges with background autofluorescence and specialized laser requirements.

Discussion:

• This work presents a novel MPM paradigm utilizing nonlinear excitation at 1550 nm for near-infrared (NIR) fluorescent molecular probes.
• This approach enables imaging with fluorophores emitting in the NIR spectrum, previously inaccessible with standard MPM.
• The system leverages readily available, fiber-based ultrafast lasers from the telecommunications industry.

Key Insights:

• Expands the spectral range of MPM by enabling the use of NIR fluorophores.
• Significantly reduces background autofluorescence, improving signal-to-noise ratio.
• Facilitates the use of compact, cost-effective telecommunication lasers for advanced microscopy.

Outlook:

• Potential for deeper tissue imaging due to reduced scattering of NIR light.
• Development of new NIR probes optimized for this excitation wavelength.
• Broader adoption of advanced microscopy techniques in biological and medical research.