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Related papers: Microwave Vortex Beam Launcher Design

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Electron vortex beams hold great promise for development in transmission electron microscopy, but have yet to be widely adopted. This is partly due to the complex set of interactions that occur between a beam carrying orbital angular…

Optics · Physics 2016-06-29 L. Clark , G. Guzzinati , A. Béché , A. Lubk , J. Verbeeck

Core-satellite structures are known to exhibit magnetic modes at optical frequencies and their characterization is important for the development of metamaterials and metafluids. We develop a finite-difference time-domain electrodynamics…

Optics · Physics 2017-12-11 John Parker , Stephen Gray , Norbert Scherer

We demonstrate the splitting of a low-energy electron beam by means of a microwave pseudopotential formed above a planar chip substrate. Beam splitting arises from smoothly transforming the transverse guiding potential for an electron beam…

Quantum Physics · Physics 2015-05-19 Jakob Hammer , Sebastian Thomas , Philipp Weber , Peter Hommelhoff

We propose methods to generate and manipulate vortex dipoles in a Bose-Einstein condensate using Gaussian beams of red or blue-detuned laser. Velocity-controlled vortex dipoles are shown to be created and launched by a red-detuned beam and…

Quantum Gases · Physics 2012-03-08 Tomohiko Aioi , Tsuyoshi Kadokura , Tetsuo Kishimoto , Hiroki Saito

A method to probe the guiding characteristics of waveguides formed in real-time is proposed and evaluated. It is based on the analysis of the time dependent light distribution observed at the exit face of the waveguide while progressively…

Optics · Physics 2007-09-18 M. Chauvet , G. Fu , G. Salamo

We studied complex lasing pattern formations in a thin-slice solid-state laser with wide-aperture laser-diode end-pumping. Radial and rectangular vortex arrays were found to be formed in a controlled fashion with symmetric and asymmetric…

Optics · Physics 2009-11-13 Kenju Otsuka , Shu-Chun Chu

A representation theory of finite electromagnetic beams in free space is formulated by factorizing the field vector of the plane-wave component into a $3 \times 2$ mapping matrix and a 2-component Jones-like vector. The mapping matrix has…

Optics · Physics 2016-02-01 Chun-Fang Li

We study experimentally and theoretically a beam splitter setup for guided atomic matter waves. The matter wave is a guided atom laser that can be tuned from quasi-monomode to a regime where many transverse modes are populated, and…

We describe the polarization topology of the vector beams emerging from a patterned birefringent liquid crystal plate with a topological charge $q$ at its center ($q$-plate). The polarization topological structures for different $q$-plates…

We report the use of an electrostatic MEMS-based device to produce high quality electron vortex beams with more than 1000 quanta of orbital angular momentum (OAM). Diffraction and off-axis electron holography experiments are used to show…

We have experimentally investigated the evolution properties of multiramp fractional vortex beams (MFVBs) in free space, by using a fundamental Gaussian beam reflecting from a phase-modulated spatial light modulator. The issue about the…

Optics · Physics 2020-08-26 Jisen Wen , Binjie Gao , Guiyuan Zhu , Yibing Cheng , Shi-Yao Zhu , Li-Gang Wang

Feasibility of Topological Metawaveguides supporting helical propagation in the microwave range has been recently proven. The advantages of unidirectional propagation supported by such waveguides however can only be exploited in real…

Applied Physics · Physics 2019-09-11 Gian Guido Gentili , Giuseppe Pelosi , Francesco S. Piccioli , Stefano Selleri

In the TE wave method, microwaves are coupled into the beam-pipe and the effect of the electron cloud on these microwaves is measured. An electron cloud (EC) density can then be calculated from this measurement. There are two analysis…

Accelerator Physics · Physics 2013-07-17 John P. Sikora , Robert M. Schwartz , Kiran G. Sonnad , David Alesini , Stefano De Santis

We show that a moving vortex lattice, as it comes to a crystal edge, radiates into a free space the harmonics of the washboard frequency, $\omega_0=2\pi v/a$, up to a superconducting gap, $\Delta/\hbar$. Here $v$ is the velocity of the…

Superconductivity · Physics 2007-05-23 L. N. Bulaevskii , E. M. Chudnovsky

A mode converter for electron vortex beams is described. Numerical simulations, confirmed by experiment, show that the converter transforms a vortex beam with topological charge $m=\pm 1$ into beams closely resembling Hermite-Gaussian…

Quantum Physics · Physics 2013-05-30 Peter Schattschneider , Michael Stoeger-Pollach , Johan Verbeeck

The vortex dynamics in mesoscopic superconducting cylinders with rectangular cross section under an axially applied magnetic field is investigated in the multivortex London regime. The rectangles considered range from a square up to an…

Superconductivity · Physics 2007-05-23 Clécio C. de Souza Silva , Leonardo R. E. Cabral , J. Albino Aguiar

We propose a method for taking a Bose-Einstein condensate in the ground trap state simultaneously to a different atomic hyperfine state and to a vortex trap state. This can be accomplished through a Raman scheme in which one of the two…

Condensed Matter · Physics 2009-10-30 Eric L. Bolda , Dan F. Walls

We propose a novel scheme for controlling the injection of a high-quality electron bunch into a channel-guided laser plasma accelerator. This all-optical technique, constricted waveguide injection, creates a highly tunable controlled…

Accelerator Physics · Physics 2024-10-22 R. J. Shalloo , A. Ferran Pousa , M. Mewes , S. Jalas , M. Kirchen , R. D'Arcy , J. Osterhoff , K. Põder , M. Thévenet

The divergence-free nature of Bessel beams can be harnessed to effectively trap optical vortices in free space laser propagation. We show how to generate arbitrary vortex configurations in Bessel traps to investigate few-body vortex…

Optics · Physics 2024-01-19 Andrew A. Voitiv , Mark E. Siemens , Mark T. Lusk

In optics, mode conversion is an elegant way to switch between Hermite Gaussian and Laguerre Gaussian beam profiles and thereby impart orbital angular momentum onto the beam and to create vortices. In optics such vortex beams can be…