Single-shot intensity diffraction tomography via polarization-multiplexed LED illumination

We present a single-shot intensity diffraction tomography method via polarization-multiplexed LED illumination. Three LED elements covered with 0°, 45°, and 135° linear polarizers, respectively, are lit up simultaneously to illuminate the sample with illumination angles matching the numerical aperture of the objective. The scattering field of the sample is recorded on a single intensity image with a polarization sensor, and three intensity images corresponding to the three LED elements are decoupled from the intensity image by using a pre-calibrated intensity transform matrix. After a slice-wise deconvolution procedure, the 3D complex refractive index distribution of the sample can be recovered. To demonstrate the performance of our method, we perform experiments on a USAF absorption resolution target, rat hippocampal cell lines, and spongy spicule. These imaging results show that our method can achieve 3D tomography for various biomedical samples with a near incoherent diffraction-limited lateral resolution of 690 nm and an axial resolution of 4.68 μm.