Surface-Plasmon Resonance-Enhanced Multiphoton Emission of High-Brightness Electron Beams from a Nanostructured Copper Cathode

Li, Renkai; To, H.; Andonian, G.; Feng, Jun; Polyakov, A. Y.; Scoby, C. M.; Thompson, Kevin; Wan, Weishi; Padmore, H. A.; Musumeci, P.

doi:10.1103/physrevlett.110.074801

Cited by 104 publications

(86 citation statements)

References 22 publications

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“…[10], we used a three-dimensional computational domain with sizes ∼ 800 × 800 × 30000 nm 3 in the (x, y, z) Cartesian coordinates. In our model, the transverse sides of the domain are all taken as periodic boundaries while the z = 0 and z = 30 μm boundaries are, respectively, set as perfect-conducting and open boundary for the electromagnetic solver used to simulate the propagation of the laser pulse.…”

Section: Electromagnetic Propertiesmentioning

confidence: 99%

“…Here, the partial current densities are given by j n (x, t, ν) = C n (ν)|S(x, t)| n , with S(x, t) being the Poynting vector associated with the exciting laser evaluated at the emitting surface, and the constant C n compiles the material properties including the reflection coefficient and multi-photon probability. The constants C n can be directly measured experimentally (see [10,11]). Given Eq.…”

Section: Beam Dynamics In the Cathode Vicinitymentioning

confidence: 99%

“…Throughout this paper, we consider a nanohole with geometry similar to the one investigated in Ref. [10].…”

Section: Numerical Simulation Techniquementioning

confidence: 99%

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Structured electron beams from nano-engineered cathodes

Lueangaramwong¹,

Mihalcea²,

Andonian³

et al. 2017

AIP Conference Proceedings

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Abstract. The ability to engineer cathodes at the nano-scale have opened new possibilities such as enhancing quantum efficiency via surface-plasmon excitation, forming ultra-low-emittance beams, or producing structured electron beams. In this paper, we present numerical investigations of the beam dynamics associated with this class of cathode in the weak-and strong-field regimes. We finally discuss the possible applications of some of the achievable cathode patterns when coupled with other phase space manipulations.

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Section: Electromagnetic Propertiesmentioning

confidence: 99%

Section: Beam Dynamics In the Cathode Vicinitymentioning

confidence: 99%

See 1 more Smart Citation

Structured electron beams from nano-engineered cathodes

Lueangaramwong¹,

Mihalcea²,

Andonian³

et al. 2017

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

show abstract

“…For example, we have discussed the possibility of creating micro/nanoscale networks for onchip wireless interconnect at optical frequencies [167,168]. A closely related topic is the use of plasmons to enhance photoemission properties [169][170][171][172][173][174].…”

Section: Photoemission From Carbon Nanotubesmentioning

confidence: 99%

Carbon Nanotube Electron Sources: From Electron Beams to Energy Conversion and Optophononics

Nojeh

2014

ISRN Nanomaterials

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Carbon nanotubes have a host of properties that make them excellent candidates for electron emitters. A significant amount of research has been conducted on nanotube-based field-emitters over the past two decades, and they have been investigated for devices ranging from flat-panel displays to vacuum tubes and electron microscopes. Other electron emission mechanisms from carbon nanotubes, such as photoemission, secondary emission, and thermionic emission, have also been studied, although to a lesser degree than field-emission. This paper presents an overview of the topic, with emphasis on these less-explored mechanisms, although field-emission is also discussed. We will see that not only is electron emission from nanotubes promising for electronsource applications, but also its study could reveal unusual phenomena and open the door to new devices that are not directly related to electron beams.

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“…Note added.-The practical application of a plamonic photocathode in an rf photogun has been recently demonstrated [27].…”

mentioning

confidence: 99%

Attention to Nanoscale Detail Leads to Brightere-Beams

Fisher¹

2013

Physics

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In this Letter, we report on the efficient generation of electrons from metals using multiphoton photoemission by use of nanostructured plasmonic surfaces to trap, localize, and enhance optical fields. The plasmonic surface increases absorption over normal metals by more than an order of magnitude, and due to the localization of fields, this results in over 6 orders of magnitude increase in effective nonlinear quantum yield. We demonstrate that the achieved quantum yield is high enough for use in rf photoinjectors operating as electron sources for MHz repetition rate x-ray free electron lasers. DOI: 10.1103/PhysRevLett.110.076802 PACS numbers: 73.20.Mf, 41.60.Cr, 78.67.Àn, 79.60.Jv High brightness electron sources are at the heart of a new generation of x-ray sources based on the free electron laser (FEL) [1], as well as in energy recovery linac and inverse Compton scattering sources [2]. The source of electrons consists of a photoinjector composed of a laser-driven photocathode in a high gradient electric field produced by a rf cavity. The function of the rf cavity is to provide a field sufficient for acceleration of electrons to relativistic velocity over a small distance, thus minimizing the effects of space charge. Even so, the dense electron beam required for high brightness suffers from a space charge field that chirps and reshapes the electron pulse, increasing beam emittance, and thus reducing the overall brightness [3]. This emittance growth can be avoided if the initial distribution of electrons is pancake shaped [4], with a semicircular transverse intensity profile. In this case, the electron distribution develops under its space charge field from a pancake into a uniformly filled ellipsoidal bunch [5]. This condition, referred to as the blowout regime, requires ultrashort pulses less than 100 fs long and has been successfully demonstrated recently in a high gradient photoinjector [6].The UV light normally used for photoinjector applications is typically produced by nonlinear crystal-based third harmonic generation using light from a Ti:sapphire 800 nm laser. By choosing a metal cathode with a work function close to the photon energy, the resulting electron beam has only a fraction of an electron volt energy spread as required for low emittance applications [7]. However, in this regime metals have low quantum efficiency, typically on the order of 10 À5 , which-combined with the losses in the harmonic generation and UV optics-requires the use of pulse energies as high as 1 mJ in order to generate sufficient charge. It has recently been demonstrated that such high pulse energies in the blowout regime yield a higher effective quantum efficiency if the fundamental 800 nm IR laser wavelength is used in a three-photon photoemission process rather than up-converting to the UV [8]. Additionally, the use of IR-based multiphoton photoemission will significantly simplify the laser system, allowing a more robust and precise beam intensity shaping. The fundamental problem with using IR wavelengths for multipho...

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Surface-Plasmon Resonance-Enhanced Multiphoton Emission of High-Brightness Electron Beams from a Nanostructured Copper Cathode

Cited by 104 publications

References 22 publications

Structured electron beams from nano-engineered cathodes

Structured electron beams from nano-engineered cathodes

Carbon Nanotube Electron Sources: From Electron Beams to Energy Conversion and Optophononics

Attention to Nanoscale Detail Leads to Brightere-Beams

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