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Confocal Raman Microscopy with Adaptive Optics
Juan David Muñoz-Bolaños1, Pouya Rajaeipour2, Kai Kummer3
1Institute of Biomedical Physics, Medical University of Innsbruck, Müllerstraße 44, 6020 Innsbruck, Austria.
ACS Photonics
|January 20, 2025
Summary
Adaptive Optics significantly boosts signal in confocal Raman microscopy for thicker samples. This label-free technique overcomes aberrations, improving image quality and enabling deeper biological studies.
Area of Science:
- Biophotonics
- Microscopy
- Spectroscopy
Background:
- Confocal Raman microscopy offers label-free chemical analysis but suffers from weak signals in thick samples.
- Wavefront aberrations from inhomogeneous samples further degrade signal quality and necessitate longer acquisition times.
Purpose of the Study:
- To introduce Adaptive Optics (AO) to confocal Raman microscopy for aberration correction.
- To enhance Raman signal intensity and improve image quality in thick, inhomogeneous samples.
Main Methods:
- A wavefront sensorless AO approach was implemented using an optofluidic spatial light modulator.
- The system was designed for seamless integration with commercial microscopes without hardware modification.
Main Results:
- Aberrations from artificial scatterers and mouse brain tissue were successfully compensated.
- Spatial resolution was improved, and Raman signal enhancement of up to 3.5-fold was achieved.
Conclusions:
- Adaptive Optics effectively counteracts aberrations in confocal Raman microscopy.
- This advancement enables deeper molecular imaging of biological systems using label-free Raman spectroscopy.
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