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Point spread function in interferometric scattering microscopy (iSCAT). Part I: aberrations in defocusing and axial localization

MPS-Authors
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Gholami Mahmoodabadi,  Reza
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;
Max-Planck-Zentrum für Physik und Medizin, Max Planck Institute for the Science of Light, Max Planck Society;

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Taylor,  Richard W.
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;
Max-Planck-Zentrum für Physik und Medizin, Max Planck Institute for the Science of Light, Max Planck Society;

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Kaller,  Martin
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;
Max-Planck-Zentrum für Physik und Medizin, Max Planck Institute for the Science of Light, Max Planck Society;

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Spindler,  Susann
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;

Mazaheri,  Mahdi
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;

Kasaian,  Kiarash
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Sandoghdar,  Vahid
Max-Planck-Zentrum für Physik und Medizin, Max Planck Institute for the Science of Light, Max Planck Society;
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;
Department of Physics, Friedrich Alexander University, Erlangen, Germany;

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Citation

Gholami Mahmoodabadi, R., Taylor, R. W., Kaller, M., Spindler, S., Mazaheri, M., Kasaian, K., et al. (2020). Point spread function in interferometric scattering microscopy (iSCAT). Part I: aberrations in defocusing and axial localization. Optics Express, 28, 25969-25988. doi:10.1364/OE.401374.


Cite as: https://hdl.handle.net/21.11116/0000-0006-9F89-D
Abstract
Interferometric scattering (iSCAT) microscopy is an emerging label-free technique optimized for the sensitive detection of nano-matter. Previous iSCAT studies have approximated the point spread function in iSCAT by a Gaussian intensity distribution. However, recent efforts to track the mobility of nanoparticles in challenging speckle environments and over extended axial ranges has necessitated a quantitative description of the interferometric point spread function (iPSF). We present a robust vectorial diffraction model for the iPSF in tandem with experimental measurements and rigorous FDTD simulations. We examine the iPSF under various imaging scenarios to understand how aberrations due to the experimental configuration encode information about the nanoparticle. We show that the lateral shape of the iPSF can be used to achieve nanometric three-dimensional localization over an extended axial range on the order of 10 µm either by means of a fit to an analytical model or calibration-free unsupervised machine learning. Our results have immediate implications for three-dimensional single particle tracking in complex scattering media.