Direct Observation of Surface Plasmon Polariton Propagation and Interference by Time-Resolved Imaging in Normal-Incidence Two Photon Photoemission Microscopy

Kahl, Philip; Podbiel, Daniel; Schneider, Christian; Makris, Andreas; Sindermann, S.; Witt, C.; Kilbane, Deirdre; Hoegen, M. Horn‐von; Aeschlimann, Martin; Heringdorf, Frank Meyer zu

doi:10.1007/s11468-017-0504-6

Cited by 50 publications

(52 citation statements)

References 29 publications

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“…In general, time-resolved PEEM images recorded in normal incidence geometry show distinct characteristic features as introduced in the study of Kahl et al ( 40 ). Near the platelet edge, where laser pulses excite the SPP waves, both electric fields superpose and form a static pattern, which resembles the spatial cross-correlation pattern of the two pulses.…”

Section: Resultsmentioning

confidence: 98%

Short-range surface plasmonics: Localized electron emission dynamics from a 60-nm spot on an atomically flat single-crystalline gold surface

et al. 2017

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Section: Resultsmentioning

confidence: 98%

Short-range surface plasmonics: Localized electron emission dynamics from a 60-nm spot on an atomically flat single-crystalline gold surface

et al. 2017

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“…1(a)]. This configuration provides imaging of the emitted electron distribution with about 30-nm spatial resolution and 100-attosecond time-delay steps [10,[42][43][44][45][46].…”

Section: Resultsmentioning

confidence: 99%

Mixing the Light Spin with Plasmon Orbit by Nonlinear Light-Matter Interaction in Gold

et al. 2019

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Transformation of light carrying spin angular momentum (SAM) to optical field vortices carrying orbital angular momentum (OAM) has been of wide interest in recent years. The interactions between two optical fields, each carrying one of those degrees of freedom, and furthermore, the transfer of the resulting angular momentum product to matter are seldom discussed. Here, we measure the interaction between 3D light carrying axial SAM and 2D plasmon-polariton vortices carrying high-order transverse OAM. The interaction is mediated by two-photon absorption within a gold surface, imprinting the resulting angular-momentum mixing into matter by excitation of electrons that are photo-emitted into vacuum. Interestingly, the spatial distribution of the emitted electrons carries the signature of a subtraction of the spin from the orbit angular momenta. We show experimentally and theoretically that the absorptive nature of this interaction leads to both single and double photon-plasmon angular momentum mixing processes by one-and two-photon interactions. Our results demonstrate high order angular momenta light-matter interactions, provide a glimpse into specific electronic excitation routes, and may be applied in future electronic sources and coherent control.

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“…Physics at these timescales was unveiled at the turn of the millennium with the development of ultrafast optics, light-wave electronics, and high harmonic generation [51]. Today, the integration of electron optics with optical technologies allows the probing of atomic transitions [51], molecular bonding [52], and even more recently dynamics of plasmonic systems [53][54][55][56][57][58][59]. Given these new experimental techniques, it is timely to ask how the long-standing physics of the Cherenkov effect changes at very short timescales.…”

Section: Introductionmentioning

confidence: 99%

Nonperturbative Quantum Electrodynamics in the Cherenkov Effect

et al. 2018

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Quantum electrodynamics (QED) is one of the most precisely tested theories in the history of science, giving accurate predictions to a wide range of experimental observations. Recent experimental advances allow for the ability to probe physics on extremely short attosecond timescales, enabling ultrafast imaging of quantum dynamics. It is of great interest to extend our understanding of short-time quantum dynamics to QED, where the focus is typically on long-time observables such as S matrices, decay rates, and cross sections. That said, solving the short-time dynamics of the QED Hamiltonian can lead to divergences, making it unclear how to arrive at physical predictions. We present an approach to regularize QED at short times and apply it to the problem of free-electron radiation into a medium, known as Cherenkov radiation. Our regularization method, which can be extended to other QED processes, is performed by subtracting the self-energy in free space from the self-energy calculated in the medium. Surprisingly, we find a number of previously unknown phenomena yielding corrections to the conventional Cherenkov effect that could be observed in current experiments. Specifically, the Cherenkov velocity threshold increases relative to the famous conventional theory. This modification to the conventional theory, which can be non-negligible in realistic scenarios, should result in the suppression of spontaneous emission in readily available experiments. Finally, we reveal a bifurcation process creating radiation into new Cherenkov angles, occurring in the strong-coupling regime, which would be realizable by considering the radiation dynamics of highly charged ions. Our results shed light on QED phenomena at short times and reveal surprising new physics in the Cherenkov effect.

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Direct Observation of Surface Plasmon Polariton Propagation and Interference by Time-Resolved Imaging in Normal-Incidence Two Photon Photoemission Microscopy

Cited by 50 publications

References 29 publications

Short-range surface plasmonics: Localized electron emission dynamics from a 60-nm spot on an atomically flat single-crystalline gold surface

Short-range surface plasmonics: Localized electron emission dynamics from a 60-nm spot on an atomically flat single-crystalline gold surface

Mixing the Light Spin with Plasmon Orbit by Nonlinear Light-Matter Interaction in Gold

Nonperturbative Quantum Electrodynamics in the Cherenkov Effect

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