Surface Plasmon Dynamics in Silver Nanoparticles Studied by Femtosecond Time-Resolved Photoemission

Lehmann, Jörg; Merschdorf, M.; Pfeiffer, Walter; Thon, A.; Voll, Sabine; Gerber, G.

doi:10.1103/physrevlett.85.2921

Cited by 208 publications

(185 citation statements)

References 30 publications

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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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“…Photoelectron emission has been shown to be enhanced by the increase of the local electrical field upon excitation of the particle plasmon of small silver clusters [21]. In this context, photoemission dynamics of surface-bound silver particles was studied in detail [22] and the influence of the collective electron dynamics could be quantified [23,24] as well as charging of the particles [22].…”

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confidence: 99%

Photoemission Electron Microscopy as a Tool for the Investigation of Optical Near Fields

et al. 2005

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Photoemission electron microscopy was used to image the electrons photoemitted from specially tailored Ag nanoparticles deposited on a Si substrate (with its native oxide SiO x ). Photoemission was induced by illumination with a Hg UV-lamp (photon energy cutoffhω U V = 5.0 eV, wavelength λ U V = 250 nm) and with a Ti:Sapphire femtosecond laser (hω l = 3.1 eV, λ l = 400 nm, pulse width below 200 fs), respectively. While homogeneous photoelectron emission from the metal is observed upon illumination at energies above the silver plasmon frequency, at lower photon energies the emission is localized at tips of the structure. This is interpreted as a signature of the local electrical field therefore providing a tool to map the optical near field with the resolution of emission electron microscopy.

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“…On one hand, damping of a LSPP in a NP can dissipate photon energy into heat. On the other hand, the energy arising from plasmon decay can also be transferred to (i) a single electron of the NP [20][21][22][23][24] or to (ii) an electron present in the vicinity of the NP (e.g., in a defect state located in the band gap of the semiconductor). As shown in Fig.…”

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confidence: 99%

Plasmon-induced photoexcitation of “hot” electrons and “hot” holes in amorphous silicon photosensitive devices containing silver nanoparticles

Moulin

Paetzold

Pieters

et al. 2013

Journal of Applied Physics

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Plasmon-induced photoexcitation of "hot" electrons and "hot" holes in amorphous silicon photosensitive devices containing silver nanoparticles We report on a plasmon-induced photocurrent in photosensitive devices based on hydrogenated amorphous silicon (a-Si:H) containing silver nanoparticles (NPs). The photocurrent is measured in a spectral region corresponding to optical transitions below the band gap of a-Si:H. Photoexcitation of "hot" electrons in the NPs or in defect states present in the vicinity of the NPs, resulting from plasmon decay in the NPs, is often cited as being responsible for this effect. In this study, we demonstrate that plasmon induced photogeneration of "hot" holes is also able to contribute to a photocurrent. A bifacial symmetrical transparent device was prepared in order to compare the internal quantum efficiency of both processes, the first based on the photogeneration of "hot" electrons and the second based on the photogeneration of "hot" holes.

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Surface Plasmon Dynamics in Silver Nanoparticles Studied by Femtosecond Time-Resolved Photoemission

Cited by 208 publications

References 30 publications

Ultrafast Multiphoton Thermionic Photoemission from Graphite

Ultrafast Multiphoton Thermionic Photoemission from Graphite

Photoemission Electron Microscopy as a Tool for the Investigation of Optical Near Fields

Plasmon-induced photoexcitation of “hot” electrons and “hot” holes in amorphous silicon photosensitive devices containing silver nanoparticles

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