Optical Bioimaging Laboratory, Department of Biomedical Engineering, College of Design and Engineering, National University of Singapore, Singapore 117576, Singapore
Zhiwei Huang (biehzw@nus.edu.sg)
Published:31 July 2024,
Published Online:01 July 2024,
Received:26 December 2023,
Revised:20 May 2024,
Accepted:30 May 2024
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Lin, S. L., Gong, L. & Huang, Z. W. Time-of-flight resolved stimulated Raman scattering microscopy using counter-propagating ultraslow Bessel light bullets generation.,Light: Science & Applications, 13, 1427-1440 (2024).
Lin, S. L., Gong, L. & Huang, Z. W. Time-of-flight resolved stimulated Raman scattering microscopy using counter-propagating ultraslow Bessel light bullets generation.,Light: Science & Applications, 13, 1427-1440 (2024). DOI: 10.1038/s41377-024-01498-y.
We present a novel time-of-flight resolved Bessel light bullet-enabled stimulated Raman scattering (B
2
-SRS) microscopy for deeper tissue 3D chemical imaging with high resolution without a need for mechanical z-scanning. To accomplish the tasks
we conceive a unique method to enable optical sectioning by generating t
he counter-propagating pump and Stokes Bessel light bullets in the sample
in which the group velocities of the Bessel light bullets are made ultraslow (e.g.
v
g
≈ 0.1c) and tunable by introducing programmable angular dispersions with a spatial light modulator. We theoretically analyze the working principle of the collinear multicolor Bessel light bullet generations and velocity controls with the relative time-of-flight resolved detection for SRS 3D deep tissue imaging. We have also built the B
2
-SRS imaging system and present the first demonstration of B
2
-SRS microscopy with Bessel light bullets for 3D chemical imaging in a variety of samples (e.g.
polymer bead phantoms
biological samples such as spring onion tissue and porcine brain) with high resolution. The B
2
-SRS technique provides a
>
2-fold improvement in imaging depth in porcine brain tissue compared to conventional SRS microscopy. The method of optical sectioning in tissue using counter-propagating ultraslow Bessel light bullets developed in B
2
-SRS is generic and easy to perform and can be readily extended to other nonlinear optical imaging modalities to advance 3D microscopic imaging in biological and biomedical systems and beyond.
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