Demonstration of a 2 × 2 programmable phase plate for electrons

Verbeeck, Johan; Béché, Armand; Müller‐Caspary, Knut; Guzzinati, Giulio; Luong, Minh Anh; Hertog, M. den

doi:10.1016/j.ultramic.2018.03.017

Cited by 104 publications

(86 citation statements)

References 79 publications

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“…138 This enables tunable control over the beam geometry that is reconstructed by interference after the electron is transmitted through the array. 138 This concept, which can be expanded further to large array sizes, holds great potential as a unique way to control beam shape in a detailed way. Schematic of electron pulse in the velocity and time domain, before and after passing through a microwave cavity.…”

Section: Spatial Domainmentioning

confidence: 99%

Electron-beam spectroscopy for nanophotonics

2019

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Progress in electron-beam spectroscopies has recently enabled the study of optical excitations with combined space, energy and time resolution in the nanometer, millielectronvolt and femtosecond domain, thus providing unique access into nanophotonic structures and their detailed optical responses. These techniques rely on ∼1-300 keV electron beams focused at the sample down to subnanometer spots, temporally compressed in wavepackets a few femtoseconds long, and in some cases controlled by ultrafast light pulses. The electrons undergo energy losses and gains, also giving rise to cathodoluminescence light emission, which are recorded to reveal the optical landscape along the beam path. This review portraits these advances, with a focus on coherent excitations, emphasizing the increasing level of control over the electron wave functions and ensuing applications in the study and technological use of optically resonant modes and polaritons in nanoparticles, 2D materials and engineered nanostructures.

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Section: Spatial Domainmentioning

confidence: 99%

Electron-beam spectroscopy for nanophotonics

2019

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“…To achieve this, an SLM would have to be incorporated within the self-imaging cavity of a multi-pass microscope, again in a plane that is conjugate to the sample. Considering recent advances in electron optics [21,22], LowPhi might also be interesting for electron microscopy, where, due to specimen damage, it is absolutely crucial to achieve highest sensitivity per electron-sample interaction [23]. First, a wavefront coming from a commercial microscope is in-coupled using a beamsplitter (BS1) and imaged onto the left half of the SLM, which is conjugate to the sample.…”

Section: Resultsmentioning

confidence: 99%

Local Optimization of Wave-fronts for optimal sensitivity PHase Imaging (LowPhi)

Juffmann

Sommer

Gigan

2020

Optics Communications

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Phase contrast microscopy is an invaluable tool in the biosciences and in clinical diagnostics. However, its sensitivity varies significantly across a given sample because it is optimized for one specific mean value of the sample induced phase shifts. Here, we demonstrate a technique based on wavefront shaping that optimizes the sensitivity across the field of view and for arbitrary phase objects. We show significant sensitivity enhancements, both for engineered test samples and red blood cells. Our technique adds on naturally to commercial phase contrast microscopes, reduces imaging artifacts, and, once initialized, allows for quantitative single-frame phase microscopy.

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“…The Guoy shift of HG beams in the mode converter can be calculated analytically with Eqn. 19. For spherical Hilbert beams we have to resort to wave optical simulations.…”

Section: Hilbert Beamsmentioning

confidence: 99%