Pascal Dreher
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View article: Polarimetric interferometer with attosecond stability for time-resolved pump-probe photoemission microscopy
Polarimetric interferometer with attosecond stability for time-resolved pump-probe photoemission microscopy Open
A phase-stabilized Mach-Zehnder interferometer with independent polarization control for each of the pump and probe beams has been implemented for time-resolved pump-probe photoemission electron microscopy. The interferometer is actively p…
View article: Spatiotemporal topology of plasmonic spin meron pairs revealed by polarimetric photo-emission microscopy
Spatiotemporal topology of plasmonic spin meron pairs revealed by polarimetric photo-emission microscopy Open
Topology is the study of geometrical properties and spatial relations\nunaffected by continuous changes, and has become an important tool for\nunderstanding complex physical systems. Although recent optical experiments\nhave inferred the e…
View article: Plasmonic Twistronics: Discovery of Plasmonic Skyrmion Bags
Plasmonic Twistronics: Discovery of Plasmonic Skyrmion Bags Open
The study of van der Waals heterostructures with an interlayer twist, known as "twistronics", has been instrumental in advancing contemporary condensed matter research. Most importantly, it has underpinned the emergence of a multitude of s…
View article: Momentum space separation of quantum path interferences between photons and surface plasmon polaritons in nonlinear photoemission microscopy
Momentum space separation of quantum path interferences between photons and surface plasmon polaritons in nonlinear photoemission microscopy Open
Quantum path interferences occur whenever multiple equivalent and coherent transitions result in a common final state. Such interferences strongly modify the probability of a particle to be found in that final state, a key concept of quant…
View article: Ultrafast Time Dynamics of Plasmonic Fractional Orbital Angular Momentum
Ultrafast Time Dynamics of Plasmonic Fractional Orbital Angular Momentum Open
The creation and manipulation of optical vortices, both in free space and in two-dimensional systems such as surface plasmon polaritons (SPPs), has attracted widespread attention in nano-optics due to their robust topological structure. Co…
View article: Angle-resolved photoelectron spectroscopy in a low-energy electron microscope
Angle-resolved photoelectron spectroscopy in a low-energy electron microscope Open
Spectroscopic photoemission microscopy is a well-established method to investigate the electronic structure of surfaces. In modern photoemission microscopes, the electron optics allow imaging of the image plane, momentum plane, or dispersi…
View article: Momentum space separation of quantum path interferences between photons and surface plasmon polaritons in nonlinear photoemission microscopy
Momentum space separation of quantum path interferences between photons and surface plasmon polaritons in nonlinear photoemission microscopy Open
Quantum path interferences occur whenever multiple equivalent and coherent transitions result in a common final state. Such interferences strongly modify the probability of a particle to be found in that final state, a key concept of quant…
View article: Angle-resolved photoelectron spectroscopy in a low energy electron microscope
Angle-resolved photoelectron spectroscopy in a low energy electron microscope Open
Spectroscopic photoemission microscopy is a well-established method to investigate the electronic structure of surfaces. In modern photoemission microscopes the electron optics allows imaging of the image plane, momentum plane, or dispersi…
View article: Focused surface plasmon polaritons coherently couple to electronic states in above-threshold electron emission
Focused surface plasmon polaritons coherently couple to electronic states in above-threshold electron emission Open
When an intense light field strongly interacts with the band structure of a solid, the formation of hybrid light-matter quantum states becomes possible. Examples of such Floquet-Bloch states have been reported, but engineering of the band …
View article: Quantitative determination of the electric field strength in a plasmon focus from ponderomotive energy shifts
Quantitative determination of the electric field strength in a plasmon focus from ponderomotive energy shifts Open
Spectroscopic photoemission microscopy is used to detect and quantify a ponderomotive shift in the energy of electrons that are emitted from a surface plasmon polariton focus. The focus is formed on an atomically flat Au(111) surface by an…
View article: Phyllotaxis-inspired nanosieves with multiplexed orbital angular momentum
Phyllotaxis-inspired nanosieves with multiplexed orbital angular momentum Open
Nanophotonic platforms such as metasurfaces, achieving arbitrary phase profiles within ultrathin thickness, emerge as miniaturized, ultracompact and kaleidoscopic optical vortex generators. However, it is often required to segment or inter…
View article: Phyllotaxis-inspired Nanosieves with Multiplexed Orbital Angular Momentum
Phyllotaxis-inspired Nanosieves with Multiplexed Orbital Angular Momentum Open
Nanophotonic platforms such as metasurfaces, achieving arbitrary phase profiles within ultrathin thickness, emerge as miniaturized, ultracompact and kaleidoscopic optical vortex generators. However, it is often required to segment or inter…
View article: Non-conventional bell-shaped diffuse scattering in low-energy electron diffraction from high-quality epitaxial 2D-materials
Non-conventional bell-shaped diffuse scattering in low-energy electron diffraction from high-quality epitaxial 2D-materials Open
A broad, bell-shaped intensity component is observed in low-energy electron diffraction from high-quality epitaxial 2D-systems. Three 2D-systems, graphene on Ir(111), graphene on SiC(0001), and hexagonal boron nitride on Ir(111), have been…
View article: Condensation of ground state from a supercooled phase in the Si(111)-(4 × 1) → (8 × 2)-indium atomic wire system
Condensation of ground state from a supercooled phase in the Si(111)-(4 × 1) → (8 × 2)-indium atomic wire system Open
Strong optical irradiation of indium atomic wires on a Si(111) surface causes the nonthermal structural transition from the (8 × 2) reconstructed ground state to an excited (4 × 1) state. The immediate recovery of the system to the ground …
View article: Precision Plasmonics with Monomers and Dimers of Spherical Gold Nanoparticles: Nonequilibrium Dynamics at the Time and Space Limits
Precision Plasmonics with Monomers and Dimers of Spherical Gold Nanoparticles: Nonequilibrium Dynamics at the Time and Space Limits Open
Monomers and dimers of spherical gold nanoparticles (NPs) exhibit highly uniform plasmonic properties at the single-particle level due to their high structural homogeneity (precision plasmonics). Recent investigations in precision plasmoni…