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. 2020 Aug 19;9:142. doi: 10.1038/s41377-020-00379-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a WPT optical setup. The spatial light interference microscopy (SLIM) add-on module is mounted to the output camera port of a phase-contrast microscope. This module shifts the phase between the incident and scattered field with π/2 increments using the SLM. The interference patterns are recorded by the camera. b Spectrum, c autocorrelation, and d second-order derivative of the autocorrelation of the halogen source measured by the spectrometer. e Three phase-shifted frames of 2-μm polystyrene beads are acquired using the SLIM module (×63/1.4 NA)