Results 41 to 50 of about 560,854 (291)
New Journal of Physics, 2019 Electron-beam shaping opens up novel imaging possibilities in electron microscopy (EM). The implementation of a phase or amplitude mask in the condenser lens system allows the generation of electron beams with various shapes. Non-diffractive Bessel beams
Simon Hettler +2 more
doaj +1 more source
Apodized phase mask coronagraphs for arbitrary apertures
, 2012 Phase masks coronagraphs can be seen as linear systems that spatially redistribute, in the pupil plane, the energy collected by the telescope. Most of the on-axis light must ideally be rejected outside the aperture to be blocked with a Lyot stop, while ...
Carlotti, Alexis
core +1 more source
Holographic microscopy reconstruction in both object and image half spaces with undistorted 3D grid [PDF]
, 2015 We propose an holographic microscopy reconstruction method, which propagates the hologram, in the object half space, in the vicinity of the object. The calibration yields reconstructions with an undistorted reconstruction grid i.e.
Alexandre, Danier +3 more
core +2 more sources
Signum phase mask differential microscopy
, 2023 We propose and experimentally demonstrate a differential microscopy method to obtain simultaneous amplitude, phase, and quantitative polarization gradient imaging in a single experimental embodiment. A full-field optical spatial differentiator is achieved in a relatively simple setup by placing a glass cover slip as a Signum phase mask in the Fourier ...
Nayak, Jeeban Kumar +3 more
openaire +2 more sources
Annular Groove Phase Mask Coronagraph [PDF]
The Astrophysical Journal, 2005 We present a new phase mask coronagraph consisting in an optical vortex induced by a space-variant surface relief subwavelength grating. Phase mask coronagraphy is a recent technique aiming at accommodating both high dynamic and high angular resolution imaging of faint sources around bright objects such as exoplanets orbiting their parent stars or host
Mawet, D. +3 more
openaire +3 more sources
Design and Application of Phase-Only Diffractive Optical Element Based on Non-Iterative Method
Photonics, 2022 In this study, we devised a method for the design of continuous phase-only holographic masks that map laser light to arbitrary target illumination patterns, which have a wide range of applications.
Kuo Shi, Gongjian Zhang
doaj +1 more source
, 2016 Specific high contrast imaging instruments are mandatory to characterize circumstellar disks and exoplanets around nearby stars. Coronagraphs are commonly used in these facilities to reject the diffracted light of an observed star and enable the direct ...
Baudoz, P. +8 more
core +3 more sources
A tunable three layer phase mask for single laser exposure 3D photonic crystal generations: bandgap simulation and holographic fabrication [PDF]
, 2011 Through the use of a multi-layer phase mask to produce five-beam interference, three-dimensional photonic crystals can be formed through single exposure to a photoresist.
Chen, KP +4 more
core +1 more source
In situ molecular organization and heterogeneity of the Legionella Dot/Icm T4SS
FEBS Letters, EarlyView.We present a nearly complete in situ model of the Legionella Dot/Icm type IV secretion system, revealing its central secretion channel and identifying new components. Using cryo‐electron tomography with AI‐based modeling, our work highlights the structure, variability, and mechanism of this complex nanomachine, advancing understanding of bacterial ...
Przemysław Dutka +11 more
wiley +1 more source
High Performance Lyot and PIAA Coronagraphy for Arbitrarily shaped Telescope Apertures
, 2013 Two high performance coronagraphic approaches compatible with segmented and obstructed telescope pupils are described. Both concepts use entrance pupil amplitude apodization and a combined phase and amplitude focal plane mask to achieve full ...
Belikov, Ruslan +4 more
core +2 more sources