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5 March 2022 Refractive index tomography of direct fs-laser written waveguides
Nicolas Barré, Ravi Shivaraman, Lisa Ackermann, Simon Moser, Michael Schmidt, Patrick Salter, Martin J. Booth, Alexander Jesacher
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Proceedings Volume PC12012, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XV; PC1201203 (2022) https://doi.org/10.1117/12.2616407
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
We present a tomographic reconstruction algorithm that is able to reconstruct waveguide profiles from a set of intensity images taken at different illumination angles. Very recently, such algorithms have become the state of the art in the community of bio imaging, but have never been applied to direct laser written structures such as waveguides. We adapt the algorithm to our application of characterizing translation-invariant structures and extend it to jointly estimate optical aberrations introduced by the imaging system. We show that a correct estimation of these aberrations is necessary for making effective use of high-angle tomographic data. Furthermore, we present a novel method for cross-validating our RI reconstructions by comparing en-face widefield images of thin waveguide sections with matching simulations based on the retrieved RI profile.
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Nicolas Barré, Ravi Shivaraman, Lisa Ackermann, Simon Moser, Michael Schmidt, Patrick Salter, Martin J. Booth, and Alexander Jesacher "Refractive index tomography of direct fs-laser written waveguides", Proc. SPIE PC12012, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XV, PC1201203 (5 March 2022); https://doi.org/10.1117/12.2616407
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KEYWORDS
Waveguides
Tomography
Refractive index
Reconstruction algorithms
Integrated photonics
Multiphoton lithography
Optical aberrations
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