Distributing the Optical Near‐Field for Efficient Field‐Enhancements in Nanostructures

Valev, Ventsislav K.; Clercq, Ben De; Biris, Claudiu G.; Zheng, Xuezhi; Vandendriessche, Stefaan; Hojeij, Mohamad; Denkova, Denitza; Jeyaram, Yogesh; Panoiu, Nicolae C.; Ekinci, Yasin; Silhanek, Alejandro; Volskiy, Vladimir; Vandenbosch, Guy A. E.; Ameloot, Marcel; Moshchalkov, Victor; Verbiest, Thierry

doi:10.1002/adma.201201151

Cited by 34 publications

(31 citation statements)

References 28 publications

(37 reference statements)

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“…The generated heat can go beyond the melting point and finally decorates the optical response of the structure. Similar simulation-experiment comparisoncan be found in [26][27][28][29][30][31].…”

Section: Volume Integral Equation Formulation and Volumetric Methods Osupporting

confidence: 69%

“…Note that the coupling coefficient is inversely proportional to the eigenvalue as in Eq. (27) and the eigenvalue is closely related with the self-impedance as in Eq. (35).…”

Section: Eigenmodes Of a Nanobarmentioning

confidence: 99%

“…For the L2 mode, the coupling (the integral in the numerator of Eq. (27)) between the incident light and the mode pattern (see the top surface charge distribution for the first three Nanoplasmonics -Fundamentals and Applicationsmodes in Figure 6(c)) should be taken into account. Since the L2 mode pattern is symmetric with respect to the short axis of the bar but the normal incident field is anti-symmetric, the coupling (the integral in the numerator of Eq.…”

Section: Eigenmodes Of a Nanobarmentioning

confidence: 99%

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Understanding the Physical Behavior of Plasmonic Antennas Through Computational Electromagnetics

Zheng

Vandenbosch²,

Moshchalkov³

2017

Nanoplasmonics - Fundamentals and Applications

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This chapter focuses on understanding the electromagnetic response of nanoscopic metallic antennas through a classical computational electromagnetic algorithm: volumetric method of moments (V-MoMs). Under the assumption that metals only respond to external electromagnetic disturbance locally, we rigorously formulate the light-nanoantenna interaction in terms of a volume integral equation (VIE) and solve the equation by using the method of moments algorithm. Modes of a nanoantenna, as the excitation independent solution to the volume integral equation (VIE), are introduced to resolve the antenna's complex optical spectrum. Group representation theory is then employed to reveal how the symmetry of a nanoantenna defines the modes' properties and determines the antenna's optical response. Through such a treatment, a set of tools that can systematically treat the interaction of light with a nanoantenna is developed, paving the road for future nanoantenna design.

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Section: Volume Integral Equation Formulation and Volumetric Methods Osupporting

confidence: 69%

“…Note that the coupling coefficient is inversely proportional to the eigenvalue as in Eq. (27) and the eigenvalue is closely related with the self-impedance as in Eq. (35).…”

Section: Eigenmodes Of a Nanobarmentioning

confidence: 99%

Section: Eigenmodes Of a Nanobarmentioning

confidence: 99%

See 1 more Smart Citation

Understanding the Physical Behavior of Plasmonic Antennas Through Computational Electromagnetics

Zheng

Vandenbosch²,

Moshchalkov³

2017

Nanoplasmonics - Fundamentals and Applications

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Section: Heating Up the Latticementioning

confidence: 99%

“Hot” in Plasmonics: Temperature‐Related Concepts and Applications of Metal Nanostructures

Kuppe

Rusimova

Ohnoutek

et al. 2019

Advanced Optical Materials

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Recent advances in nonlinear optics, hot electrons for renewable energy (e.g., solar cells and water‐splitting), acousto‐optics, nanometalworking, nanorobotics, steam generation, and photothermal cancer therapy are reviewed here. In all these areas, one of the key enabling properties is the ability of metallic nanoparticles to harvest and control light at the subwavelength scale by supporting coherent electronic oscillations, called localized surface plasmon resonances (LSPRs). Various physical properties and potential areas of application emerge depending on the decay mechanism of the LSPR and, especially, depending on the considered timescale. The field of plasmonics has mainly been associated with manipulating electromagnetic near‐fields at the nanoscale, where absorption is an obstacle. However, plasmonic absorption leads to a stream of temperature‐related phenomena that have only recently attracted significant attention. The goal of this review is to highlight exciting new areas of research (such as nanorobotics, nanometalworking, or acousto‐optical techniques) and to survey the most recent progress in more established areas (such as hot electrons, photothermal therapy, and plasmonic steam generation). To set each research area in context, the text is organized around the thermal cycle of the nanoparticles.

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“…[22], at intensities up to 50 GW=cm 2 photoemission is predominantly a multiphoton process. In the space charge limit [23], a 1 J (1 W at 1 MHz) 800 nm, 10 fs pulse and a 70 MV=m extraction field would yield a pulse charge: The more than 6 orders of magnitude yield enhancement achieved allows us to satisfy the requirements of modern FEL designs [24] at laser intensities below the metal's ablation threshold [25]. Moreover, the modest pulse energy required allows operation at MHz repetition rates using conventional watt-class Ti:sapphire regenerative amplifiers.…”

Section: -3mentioning

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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Distributing the Optical Near‐Field for Efficient Field‐Enhancements in Nanostructures

Cited by 34 publications

References 28 publications

Understanding the Physical Behavior of Plasmonic Antennas Through Computational Electromagnetics

Understanding the Physical Behavior of Plasmonic Antennas Through Computational Electromagnetics

“Hot” in Plasmonics: Temperature‐Related Concepts and Applications of Metal Nanostructures

Attention to Nanoscale Detail Leads to Brightere-Beams

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