Prof. Marc Spehr Profile

Prof. Marc Spehr

at RWTH Aachen Univ

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Proceedings Article | 5 March 2021 Open Access

Enhanced field-of-view high-resolution lattice light sheet microscopy with phased array beam formers

J. Witzens, M. Spehr, P. Van Dorpe, N. Verellen

Proceedings Volume 11652, 1165207 (2021) https://doi.org/10.1117/12.2576700

KEYWORDS: Microscopy, Phased arrays, Photonic integrated circuits, Point spread functions, Light wave propagation, Laser beam propagation, Image resolution, Structured light, Silicon photonics, Silicon

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The data acquisition speed of point scanning microscopy techniques at sub-cellular resolution limits imaging of large samples, as sample stability and focus drift are becoming an issue. Therefore, light sheet fluorescent microscopy (LSFM) has become the method of choice for imaging cleared samples. However, this method still suffers from a trade-off between imaging depth and resolution, due to diffraction of the illuminating beam limiting the achievable field of view. After improvement of the latter with non-diffracting Bessel beams, lattice light sheet microscopy has substantially reduced the illumination point-spread-function (PSF). Here, we propose further improvement by generation of structured light sheets via phased arrays implemented as silicon nitride photonic integrated circuits (PICs). Beam generation with PICs results in much higher power efficiency than beam forming with conventional liquid crystal based spatial phase modulators, as it does not require the use of narrow blocking apertures. Moreover, this approach enables increased control over the generated field profile. Modeling of concrete PIC concepts indicates that sub-cellular resolution with mm scale imaging depths can be concomitantly achieved. Maintaining a small PSF along the axis perpendicular to the direction of light propagation is sacrificed in order to maintain it over increased imaging depth along the beam propagation axis. Rapid lateral scanning of the illumination beam inside the plane of the light sheet is then obtained by scanning of the laser wavelength within the excitation spectrum of the target fluorescent protein, allowing for a wide bidirectional field-of-view with high resolution.

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