A. G. Fedorov | Searcharxiv

arXiv2026

Resolution Estimation of a Digital Holographic Microscope Using Neural Network Analysis of Reconstructed Images

This paper presents a method for estimating the resolution of a digital holographic microscope using neural network analysis of reconstructed images. The spectral bandwidth of the source ($Δλ$) is used as a controlled image degradation parameter. Numerical simulations were performed within inline Gabor holography. A dataset of reconstructed images was generated for several test objects over a $Δλ$ range from 0.05 to 20 nm. The model predicts $Δλ$ from reconstructed images with high precision. The predictions are consistent with standard resolution metrics, including FWHM, MTF, and the USAF resolution criterion. The generalization analysis shows that the model is sensitive to the type of degradation. It captures interferometric distortions and responds selectively to the underlying physical mechanism. The proposed approach enables resolution estimation without explicit modeling of all degradation factors and can be applied to compact holographic systems.

physics.optics↗

arXiv2008

Interlayer coupling in EuS/SrS, EuS/PbSe and EuS/PbTe magnetic semiconductor superlatices

Neutron reflectivity studies of EuS/SrS, EuS/PbSe, and EuS/PbTe all-semiconductor superlattices were carried out in search for exchange interlayer coupling. A relatively weak antiferromagnetic coupling was found in EuS/SrS and in EuS/PbSe systems but no interlayer coupling was detected in EuS/PbTe superlattices. In EuS/SrS, where the SrS spacer is an insulator ($E_g\approx 4$ eV), a very weak and short range interlayer coupling is in agreement with the earlier theoretical predictions that the interlayer coupling strength in EuS-based magnetic semiconductor superlattices depends strongly on the energy gap of the nonmagnetic layer and should decrease with an increase of the energy gap of the spacer material. A weak coupling in EuS/PbSe and no coupling in EuS/PbTe, where both PbSe and PbTe are narrow-gap semiconductors ($E_g\approx 0.3$ eV), is in disagreement not only with the theoretical expectations but also in a stark contrast with earlier results for another narrow-gap spacer system -- EuS/PbS, where pronounced antiferromagnetic coupling persists even in samples with PbS layer thickness as large as 200 Å. A possible influence of the increasing lattice mismatch between EuS and the spacer materials (0.5%, 0.8%, 2.5%, and 8.2% for PbS, SrS, PbSe, and PbTe, respectively) on the magnetic in-plane ordering of EuS layer and, consequently, on the interlayer coupling was investigated by polarized neutron reflectometry in the case of EuS/PbTe.

cond-mat.mtrl-sci↗