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

Frank, Bettina; Kahl, Philip; Podbiel, Daniel; Spektor, Grisha; Orenstein, Meir; Fu, Liwei; Weiß, Thomas; Hoegen, M. Horn‐von; Davis, Timothy J.; Heringdorf, Frank-J. Meyer zu; Gießen, Harald

doi:10.1126/sciadv.1700721

Cited by 93 publications

(104 citation statements)

References 62 publications

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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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“…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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“…Due to their atomic flatness and well-defined crystal structure, such plasmonic films and nanoparticles exhibit larger plasmon propagation lengths and sharper resonances due to lower Ohmic losses and reduced surface scattering [37,38]. These superior plasmonic properties have been utilized in the fabrication of plasmonic nano-circuits [39,40], nano-antennae [37,41,42], and other structures [43][44][45]. It is therefore relatively easy to eliminate material imperfections (at least) in the substrate by using monocrystalline flakes, a seemingly straightforward approach that promises the GSP-based metasurface efficiency improvement by modest, but noticeable ≈ 5%, as suggested by the numerical simulations discussed below.…”

Section: Introductionmentioning

confidence: 99%

Use of monocrystalline gold flakes for gap plasmon-based metasurfaces operating in the visible

Boroviks

Todisco

Mortensen

et al. 2019

Opt. Mater. Express

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Gap plasmon-based optical metasurfaces have been extensively used for demonstration of flat optical elements with various functionalities efficiently operating at near-infrared and telecom wavelengths. Extending their operation to the visible is however impeded by the progressively increased plasmon absorption for shorter wavelengths. We investigate the possibility to improve the performance of gap plasmon-based metasurfaces in the visible by employing monocrystalline gold flakes as substrates instead of evaporated polycrystalline gold films, while using the electron-beam lithography patterning of the evaporated thin gold films for fabrication of top gold nanobricks, which define gap-plasmon resonator elements of the metasurfaces. We demonstrate that the efficiency can be improved by modest but noticeable amount of ≈ 5% if all other configuration parameters are preserved.

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“…The femtosecond dynamics of the formation of the plasmonic vortex can be studied using time-resolved two-photon photoemission electron microscopy [8]. Such structures can be used as plasmonic lenses by focusing the light field to subwavelength dimensions [9][10][11][12]. While for the SPP the field is confined at the two-dimensional surface, there is the optical analogue of a vortex field, known as orbital angular momentum (OAM) light.…”

Section: Introductionmentioning

confidence: 99%

Interaction of an Archimedean spiral structure with orbital angular momentum light

et al. 2018

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Complementing the research of surface plasmon polariton vortices for Archimedean spiral structures grooved in gold platelets, we here study the analogous positive structure of an Archimedean spiral consisting of bent gold nanorods. We consider spirals of two different sizes, for which we perform numerical calculations with the boundary element method. For a micrometer-sized metallic structure we show that the scattered electric field forms a vortex in the centre of the spiral. When the spiral is illuminated by orbital angular momentum light, the topological charge of the vortex can be controlled. For a nanometer-sized plasmonic Archimedean spiral we find that the response to optical excitation is governed by several resonances. When the nanostructure is excited by orbital angular momentum light, different resonances appear compared to the excitation with plane waves. Our results highlight that the distinct architecture of the Archimedean spiral responds in a unique way to the excitation with orbital angular momentum light.

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

Abstract: We demonstrate nanofocusing down to 60 nm with 800-nm light in atomically flat single-crystalline 22-nm-thick gold flakes.

Cited by 93 publications

References 62 publications

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

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

Use of monocrystalline gold flakes for gap plasmon-based metasurfaces operating in the visible

Interaction of an Archimedean spiral structure with orbital angular momentum light

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