Femtosecond Imaging of Surface Plasmon Dynamics in a Nanostructured Silver Film

Kubo, Atsushi; Onda, Ken; Petek, Hrvoje; Sun, Zhijun; Jung, Yun Suk; Kim, Hong Koo

doi:10.1021/nl0506655

Cited by 442 publications

(453 citation statements)

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“…Because the IPS is a universal property of molecular sheets [56], the ILB is derived from IPS by stacking them into a 3D solid [57]; screening is inefficient, and similar hot electron dynamics could occur in other quasi-2D materials with low densities of states at the Fermi level. Moreover, thermionic emission can occur in other materials and is likely to be the dominant process for photoemission from plasmonic nanoparticles where hot electron generation and light localization are particularly efficient [91][92][93].…”

Section: Discussionmentioning

confidence: 99%

Ultrafast Multiphoton Thermionic Photoemission from Graphite

et al. 2017

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Electronic heating of cold crystal lattices in nonlinear multiphoton excitation can transiently alter their physical and chemical properties. In metals where free electron densities are high and the relative fraction of photoexcited hot electrons is low, the effects are small, but in semimetals, where the free electron densities are low and the photoexcited densities can overwhelm them, the intense femtosecond laser excitation can induce profound changes. In semimetal graphite and its derivatives, strong optical absorption, weak screening of the Coulomb potential, and high cohesive energy enable extreme hot electron generation and thermalization to be realized under femtosecond laser excitation. We investigate the nonlinear interactions within a hot electron gas in graphite through multiphoton-induced thermionic emission. Unlike the conventional photoelectric effect, within about 25 fs, the memory of the excitation process, where resonant dipole transitions absorb up to eight quanta of light, is erased to produce statistical Boltzmann electron distributions with temperatures exceeding 5000 K; this ultrafast electronic heating causes thermionic emission to occur from the interlayer band of graphite. The nearly instantaneous thermalization of the photoexcited carriers through Coulomb scattering to extreme electronic temperatures characterized by separate electron and hole chemical potentials can enhance hot electron surface femtochemistry, photovoltaic energy conversion, and incandescence, and drive graphite-to-diamond electronic phase transition.

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Section: Discussionmentioning

confidence: 99%

Ultrafast Multiphoton Thermionic Photoemission from Graphite

et al. 2017

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“…Applications are diverse and include surface enhanced Raman scattering [1,2], second [3,4] and third [5,6] harmonic generation, two-photon photoluminescence [59,60], continuum generation [61] or localized multiphoton photoemission [7,8]. Recently, even higher nonlinear effects such as above-threshold and strong-field photoemission and acceleration were observed in plasmonic and other nanostructures [12,62,63,17,15,64], closing the gap to strong-field and attosecond physics.…”

Section: Methodsmentioning

confidence: 99%

“…In this wavelength regime, the absorption of photons in air under ambient conditions is a critical issue and limits photon propagation distances to the range of only several tens of micrometers 8 . Thus, for a practical experimental scheme in which EUV radiation from nanostructures can be investigated, it is necessary to implement the generation and the spectral detection of the EUV light in a suitable vacuum environment.…”

Section: Home-built Vacuum Setup For Euv Light Generation and Spectramentioning

confidence: 99%

“…This allows for the study of numerous linear and nonlinear optical processes such as surface-enhanced Raman scattering [1,2], second [3,4] and third [5,6] harmonic generation, and multiphoton photoemission [7,8] using low-energy laser pulses with high (MHz) repetition rates. The rapidly increasing number of reports about the enhancement of optical phenomena in nanoantennas, -waveguides, -tips, -spheres, -particles, and rough surfaces impressively illustrate the growing importance of nano-optics in the natural sciences.…”

Section: Introductionmentioning

confidence: 99%

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Extreme-ultraviolet light generation in plasmonic nanostructures

et al. 2013

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The present (cumulative) thesis examines fundamentals of nanostructure-enhanced extreme-ultraviolet light generation in noble gases using two different nanostructure geometries for local field-enhancement. Specifically, resonant antennas and tapered hollow waveguide nanostructures are utilized to enhance low-energy femtosecond laser pulses, which in turn induce light emission from excited xenon, argon and neon atoms and ions. Spectral analysis of this radiation reveals that coherent high-order harmonic generation is not feasible under the examined conditions, contrary to former expectations and reports. Instead, the spectral characteristics unequivocally identify that incoherent fluorescence from multiphoton excited and strong-field ionized gas atoms is the predominant process in such schemes. Furthermore, novel nanostructure-enhanced effects are reported such as surface-enhanced fifth-order harmonic generation (from bow-tie nanoantennas) and the formation of a bistable nanoplasma (in a hollow waveguide). These effects offer intriguing links between nonlinear nano-optics, plasma dynamics and extreme-ultraviolet radiation.v vi

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“…Furthermore, we show the existence of multiple branches of such FB modes that have slow light characteristics fundamentally different from the single thin film case. Our work can lead to applications where FB modes are used for thin-film characterization [12], sensing [13], imaging [14], absorption enhancement [15] and polarization control [16].…”

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confidence: 99%

Ferrell–Berreman Modes in Plasmonic Epsilon-near-Zero Media

et al. 2014

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We observe unique absorption resonances in silver/silica multilayer-based epsilon-near-zero (ENZ) metamaterials that are related to radiative bulk plasmon-polariton states of thin-films originally studied by Ferrell (1958) and Berreman (1963). In the local effective medium, metamaterial description, the unique effect of the excitation of these microscopic modes is counterintuitive and captured within the complex propagation constant, not the effective dielectric permittivities. Theoretical analysis of the band structure for our metamaterials shows the existence of multiple Ferrel-Berreman branches with slow light characteristics. The demonstration that the propagation constant reveals subtle microscopic resonances can lead to the design of devices where Ferrell-Berreman modes can be exploited for practical applications ranging from plasmonic sensing to imaging and absorption enhancement. Keywords: plasmon resonance, epsilon-near-zero, metamaterials, plasmonics An important class of artificial media are the epsilon-near-zero (ENZ) metamaterials that are designed to have a vanishing dielectric permittivity | | → 0. Waves propagating within ENZ media have a divergent phase velocity that can be used to guide light with zero phase advancement through sharp bends within sub-wavelength size channels [1, 2], or to tailor the phase of radiation/luminescence within a prescribed ENZ structure [3,4]. The electric field intensity within an ENZ medium can be enhanced relative to that in free space leading to strong light absorption [5]. This enhanced absorption in ENZ media has been exploited for novel polarization control and filtering in thin films [6], as well the proposal to use ENZ absorption resonances to tune thermal blackbody radiation of a heated object to the band-gap of a photovoltaic cell [7]. An enhanced non-linear response based upon strong spatial dispersion of waves in ENZ media has been demonstrated, and proposed for all-optical switching [8,9].Here we show theoretically and experimentally that ENZ metamaterials support unique absorption resonances related to radiative bulk plasmon-polaritons of thin metal films. These radiative bright modes exhibit properties in stark contrast to conventional dark modes of thin-film media (surface plasmon polaritons). The unique absorption resonances manifested in our metamaterials were originally studied by Ferrell in 1958 for plasmon-polaritonic thinfilms in the ultraviolet [10], and by Berreman in 1963 for phonon-polaritonic thin-films in the mid-infrared spectral region [11]. Surprisingly, two research communities have developed this independently with little communication or overlap until now: we therefore address these resonances as Ferrell-Berreman (FB) modes of our metamaterials. Counterintiutively, in the metamaterial effective medium picture, these resonances are not captured in the metamaterial dielectric permittivity constants but rather in the effective propagation constant. Furthermore, we show the existence of multiple branches of such FB modes that have slow ...

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Femtosecond Imaging of Surface Plasmon Dynamics in a Nanostructured Silver Film

Cited by 442 publications

References 45 publications

Ultrafast Multiphoton Thermionic Photoemission from Graphite

Ultrafast Multiphoton Thermionic Photoemission from Graphite

Extreme-ultraviolet light generation in plasmonic nanostructures

Ferrell–Berreman Modes in Plasmonic Epsilon-near-Zero Media

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