3 papers
physics.optics2026
Laser-induced phase shift of swift electrons
Christian Dwyer, David M. Paganin
We revisit the calculation of the phase shift experienced by swift electrons on passing through the electromagnetic field of a laser. Such phase shifts are now utilized in the form…
physics.optics2026
Generalized Zernike Phase-Contrast Imaging
Christian Dwyer, David M. Paganin
Zernike phase-contrast imaging is unique among imaging techniques in that it enables the upper limit of Fisher information allowed by quantum mechanics. Here we show that, in a dep…
physics.optics2023
Quantum and classical Fisher information in four-dimensional scanning transmission electron microscopy
Christian Dwyer, David M. Paganin
We analyze the quantum limit of sensitivity in four-dimensional scanning transmission electron microscopy (4D-STEM), which has emerged as a favored technique for imaging the struct…