Coherent nanophotonic electron accelerator

Nature, Journal Year: 2023, Volume and Issue: 622(7983), P. 476 - 480

Published: Oct. 18, 2023

Language: Английский

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Subrelativistic Alternating Phase Focusing Dielectric Laser Accelerators

Physical Review Letters, Journal Year: 2024, Volume and Issue: 132(8)

Published: Feb. 23, 2024

We demonstrate a silicon-based electron accelerator that uses laser optical near fields to both accelerate and confine electrons over extended distances. Two dielectric (DLA) designs were tested, each consisting of two arrays silicon pillars pumped symmetrically by pulse front tilted beams, designed for average acceleration gradients 35 $50\text{ }\text{ }\mathrm{MeV}/\mathrm{m}$, respectively. The DLAs are act as alternating phase focusing (APF) lattices, where electrons, depending on the electron-laser interaction phase, will alternate between opposing longitudinal transverse defocusing forces. By incorporating fractional period drift sections alter synchronous $\ifmmode\pm\else\textpm\fi{}60\ifmmode^\circ\else\textdegree\fi{}$ off crest, captured in bucket experience half peak gradient while also experiencing strong confinement forces enable long lengths. APF accelerators with lengths up $708\text{ }\mathrm{\ensuremath{\mu}}\mathrm{m}$ energy gains $23.7\ifmmode\pm\else\textpm\fi{}1.07\text{ }\mathrm{keV}$ FWHM, 25% increase from starting energy, demonstrating ability achieve substantial subrelativistic DLA.

Language: Английский

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Coherently amplified ultrafast imaging using a free-electron interferometer

Nature Photonics, Journal Year: 2024, Volume and Issue: 18(8), P. 809 - 815

Published: July 3, 2024

Language: Английский

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Maximal Quantum Interaction between Free Electrons and Photons

Physical Review Letters, Journal Year: 2025, Volume and Issue: 134(4)

Published: Jan. 31, 2025

The emerging field of free-electron quantum optics enables electron-photon entanglement and holds the potential for generating nontrivial photon states information processing. Although recent experimental studies have entered regime, rapid theoretical developments predict that qualitatively unique phenomena only emerge beyond a certain interaction strength. It is thus pertinent to identify maximal strength materials, geometries, particle energies enable one approach it. We derive an upper limit vacuum between free electrons single-mode photons, which illuminates conditions strongest interaction. Crucially, we obtain explicit energy selection recipe photons achieve at arbitrary separations two optimal regimes favoring either fast or slow over those with intermediate velocities. validate by analytical numerical calculations on canonical geometries provide near-optimal designs indicating feasibility strong interactions. Our findings offer fundamental intuition maximizing practical design rules future experiments electron-mediated photon-photon entanglement. They should also evaluation key metrics applications such as maximum power radiation sources acceleration gradient dielectric laser accelerators.

Language: Английский

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Jaynes-Cummings interaction between low-energy free electrons and cavity photons

Science Advances, Journal Year: 2023, Volume and Issue: 9(22)

Published: May 31, 2023

The Jaynes-Cummings Hamiltonian is at the core of cavity quantum electrodynamics; however, it relies on bound-electron emitters fundamentally limited by binding Coulomb potential. In this work, we propose theoretically a new approach to realizing model using low-energy free electrons coupled dielectric microcavities and exemplify several technologies made possible approach. Using recoil, large detuning inhibits emission multiple consecutive photons, effectively transforming electron into few-level system mode. We show that can be used for generation single photon pairs, even SWAP gate between electron, with unity efficiency high fidelity. Tunable their kinetic energy, are inherently versatile an engineerable wavelength. Hence, they pave way toward possibilities interconnects photonic platforms disparate spectral regimes.

Language: Английский

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Strong Coupling and Single-Photon Nonlinearity in Free-Electron Quantum Optics

ACS Photonics, Journal Year: 2024, Volume and Issue: 11(8), P. 3401 - 3411

Published: July 29, 2024

A central challenge in the emerging field of free-electron quantum optics is to achieve strong interaction and single-photon nonlinearity between a flying free electron photonic mode. Existing schemes are intrinsically limited by diffraction, which puts an upper bound on length and, therefore, strength coupling nonlinearity. Here, we propose "free-electron fibers": effectively one-dimensional systems where electrons copropagate with two guided modes. The first mode applies ponderomotive trap electron, removing limitations due diffraction. second strongly couples enhanced that orders magnitude larger than previous designs. extended lengths enabled our scheme allow for nonlinearities mediated electrons. We predict novel effects system such as deterministic emission nonlinear multimode dynamics. Our proposal paves way toward realization heralded macroscopic nonclassical light generation, sources, gates controlled free-electron–photon interactions.

Language: Английский

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Free-electron Brewster-transition radiation

Science Advances, Journal Year: 2023, Volume and Issue: 9(32)

Published: Aug. 11, 2023

We reveal a mechanism to enhance particle-matter interactions by exploiting the pseudo-Brewster effect of gain materials, presenting an enhancement at least four orders magnitude for light emission. This is enabled emergence unprecedented phase diagram that maps all phenomena free-electron transition radiation into three distinct phases in gain-thickness parameter space, namely, conventional, intermediate, and Brewster phases, when electron penetrates dielectric slab with modest finite thickness. Essentially, our revealed corresponds phase, which also features ultrahigh directionality, always angle, regardless velocity. Counterintuitively, we find intensity this Brewster-transition insensitive Fabry-Pérot resonance condition and, thus, variation thickness, moreover, weaker could lead stronger

Language: Английский

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Resonating Electrostatically Guided Electrons

Physical Review Letters, Journal Year: 2024, Volume and Issue: 132(25)

Published: June 17, 2024

An essential component for quantum-enhanced measurements with free electrons is an electron resonator. We report stable guiding of at 50 eV energy up to seven round trips in a linear autoponderomotive structure, which realized two microstructured printed circuit boards that generate the required electromagnetic fields. Free are laser triggered from sharp tungsten needle tip and coupled front resonator help sub-nanosecond-fast switchable mirrors. After variable time delay, we open rear mirror measure number trapped delay-line detector. demonstrate, simulate, show ways optimizing simulations, will enable ``interaction-free'' measurement setups, including multipass quantum-Zeno effect based schemes, helping realize quantum microscope.

Language: Английский

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Numerical investigation of an anti-symmetric nanophotonic structure for accelerating sub-relativistic electron beams

Journal of Applied Physics, Journal Year: 2025, Volume and Issue: 137(3)

Published: Jan. 15, 2025

This study investigates an anti-symmetrically positioned nanophotonic dual-pillar structure, in which the dielectric and vacuum components are evenly distributed along direction of electron propagation, with each pillar facing a region. Our numerical simulation results show that previously proposed symmetric grating where pillars other alternated gaps, is accompanied by deceleration region, preventing achievement high gradients during acceleration process. By contrast, anti-symmetric structure eliminates field generates uniformly field. requires two oppositely directed laser beams crossing transverse region must have phase shift π case. has significant potential for accelerating sub-relativistic beams. In this simulation, initial energy selected as 79 keV. The gradient provided design electrons approximately 70 MeV/m; however, can provide maximum up to ∼430 MeV/m.

Language: Английский

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An improved inverse design method based on AVM for long-distance dielectric laser accelerators

Optics Express, Journal Year: 2025, Volume and Issue: 33(7), P. 14737 - 14737

Published: March 14, 2025

The dielectric laser accelerator (DLA) is an innovative on-chip particle that employs a periodic structure to modulate beam, generating longitudinal accelerating field propel particles. Leveraging the high laser-induced damage threshold of materials, DLAs can achieve significantly higher acceleration gradients compared traditional accelerators. Current inverse design approaches for DLAs, based on adjoint variable method (AVM), overlook impact changes in electron velocity, which result dephasing between electrons and over long distances. To address this limitation, we propose improved incorporates velocity variations into objective function, specifically tailored long-distance structures. Using incident electric amplitude 1.2 GV/m, designed 20 µm DLA capable 26.6 keV with average gradient 347 MeV/m. Our ensures sustained across entire structure, surpassing energy gain limits imposed by original approach. Furthermore, optimal initial closely aligns target value (26.6 keV), demonstrating issue has been effectively resolved. This advancement paves way more efficient robust acceleration.

Language: Английский

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