Quantitative phase imaging (QPI) is a powerful label-free imaging technique that enables high-resolution, three-dimensional imaging of unlabeled samples by exploiting refractive index (RI) distributions as intrinsic imaging contrast. In this talk, we present the latest developments in 3D QPI techniques for investigations of live cells, tissues, and organoids over a long period of time. We will introduce several reference-free QPI approaches with incoherent light sources and discuss the considerations of multiple light scattering into a tomographic reconstruction algorithm1-3. Additionally, we will present a method of measuring 3D dielectric tensor tomograms, which expands the applicability of QPI to 3D birefringent materials. These technological developments hold great promise for advancing 3D label-free high-resolution imaging and its application in various fields, particularly in photonics.
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