A new publication in Physical Review Applied by Dorian Bouchet, Jonathan Dong, Dante Maestre, and Thomas Juffmann, titled "Fundamental Bounds on the Precision of Classical Phase Microscopes" "A wide variety of imaging systems have been designed to measure phase variations, with applications from physics to biology and medicine. In this work, we theoretically compare the precision of phase estimations achievable with classical phase microscopy techniques, operated at the shot-noise limit. We show how the Cramér-Rao bound is calculated for any linear optical system, including phase-contrast microscopy, phase-shifting ho.." Read more here: https://doi.org/10.1103/PhysRevApplied.15.024047

A new publication in OSA Continuum by Jacob Seifert, Dorian Bouchet, Lars Loetgering, and Allard P. Mosk, titled "Efficient and flexible approach to ptychography using an optimization framework based on automatic differentiation". Abstract: "Ptychography is a lensless imaging method that allows for wavefront sensing and phase-sensitive microscopy from a set of diffraction patterns. Recently, it has been shown that the optimization task in ptychography can be achieved via automatic differentiation (AD). Here, we propose an open-access AD-based framework implemented with TensorFlow .." Read more here: https://doi.org/10.1364/OSAC.411174

A new publication in Optics Letters by Dorian Bouchet, Jacob Seifert, and Allard P. Mosk, titled "Optimizing illumination for precise multi-parameter estimations in coherent diffractive imaging" Abstract "Coherent diffractive imaging (CDI) is widely used to characterize structured samples from measurements of diffracting intensity patterns. We introduce a numerical framework to quantify the precision that can be achieved when estimating any given set of parameters characterizing the sample from measured data. The approach, based on the calculation of the Fisher information matrix, provides a clear benchmark to assess the performance of CDI methods..." Read more here: https://doi.org/10.1364/OL.411339

"The use of coherent light for precision measurements has been a key driving force for numerous research directions, ranging from biomedical optics to semiconductor manufacturing. Recent work demonstrates that the precision of such measurements can be significantly improved by tailoring the spatial profile of light fields used for estimating an observable system parameter. These advances naturally raise the intriguing question of which states of light can provide the ultimate measurement precision. Here, we introduce a general approach to determine the optimal coherent states of light for estimating any given parameter, regardless of the complexity of the system..." Read more here: https://arxiv.org/abs/2002.10388

"We study the fundamental limit on the localization precision for a subwavelength scatterer embedded in a strongly scattering environment, using the external degrees of freedom provided by wavefront shaping. For a weakly scattering target, the localization precision improves with the value of the local density of states at the target position. ... " Read more here: https://doi.org/10.1103/PhysRevLett.124.133903