A5008296512- Quantum Electrodynamics and Casimir Effect
- Cold Atom Physics and Bose-Einstein Condensates
- Thermal Radiation and Cooling Technologies
- Mechanical and Optical Resonators
- Quantum Information and Cryptography
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Mechanics and Applications
- Quantum optics and atomic interactions
- Quantum and electron transport phenomena
- Near-Field Optical Microscopy
- Atomic and Subatomic Physics Research
- Strong Light-Matter Interactions
- Experimental and Theoretical Physics Studies
- Photonic and Optical Devices
- Advanced Frequency and Time Standards
- Photonic Crystals and Applications
- Cosmology and Gravitation Theories
- Quantum, superfluid, helium dynamics
- Astrophysics and Star Formation Studies
- Plasmonic and Surface Plasmon Research
- Force Microscopy Techniques and Applications
- Atomic and Molecular Physics
- Optical properties and cooling technologies in crystalline materials
- Molecular Junctions and Nanostructures
- Spectroscopy and Laser Applications
University of Potsdam
2015-2024
Ben-Gurion University of the Negev
2021-2024
Walter de Gruyter (Germany)
2020
Deutsche Nationalbibliothek
2020
King Abdulaziz University
2015
Max Planck Institute for Radio Astronomy
2010-2015
Carl von Ossietzky Universität Oldenburg
2014
Czech Academy of Sciences, Institute of Physics
2012
Los Alamos National Laboratory
2010
Institut d’Optique Graduate School
1994-2004
We study the heat transfer between two parallel metallic semi-infinite media with a gap in nanometer-scale range. show that near-field radiative flux saturates at distances smaller than metal skin depth when using local dielectric constant and investigate origin of this effect. The effect nonlocal corrections is analyzed Lindhard-Mermin Boltzmann-Mermin models. find models yield same fluxes for gaps larger $2\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. Finally, we explain saturation observed...
The existing optical microscopes form an image by collecting photons emitted from object. Here we report on the experimental realization of microscopy without need for direct communication with sample. To achieve this, have scanned a single gold nanoparticle acting as nanoantenna in near field sample and studied modification its intrinsic radiative properties monitoring plasmon spectrum.
The heat transport mediated by near-field interactions in networks of plasmonic nanostructures is shown to be analogous a generalized random walk process. existence superdiffusive regimes demonstrated both linear ordered chains and three-dimensional analyzing the asymptotic behavior corresponding probability distribution function. We show that spread these described type L\'evy flight. presence such anomalous heat-transport opens way design new generation composite materials able faster than...
The Casimir force between metallic plates made of realistic materials is evaluated for distances in the nanometer range. A spectrum over real frequencies introduced and shows narrow peaks due to surface resonances (plasmon polaritons or phonon polaritons) that are coupled across vacuum gap. We demonstrate originates from attraction (repulsion) corresponding symmetric (antisymmetric) eigenmodes, respectively. This picture used derive a simple analytical estimate at short distances. recover...
We establish strict upper limits for the Casimir interaction between multilayered structures of arbitrary dielectric or diamagnetic materials. discuss appearance different power laws due to frequency-dependent material constants. Simple analytical expressions are in good agreement with numerical calculations based on Lifshitz theory. improvements required current (meta) materials achieve a repulsive force.
In this paper we study the role of surface plasmon modes in Casimir effect. The energy can be written as a sum over real cavity and one may identify two sorts modes, evanescent propagative modes. As becomes for some choice parameters adopt an adiabatic mode definition where follow into sector count it together with contribution, calling contribution ``plasmonic.'' We evaluate analytically plasmonic to energy. Surprisingly find that repulsive intermediate large mirror separations. plasmons...
Within the framework of HERM33ES key project, we are studying star forming interstellar medium in nearby, metal-poor spiral galaxy M33, exploiting high resolution and sensitivity Herschel. We use PACS SPIRE maps at 100, 160, 250, 350, 500 micron wavelength, to study variation spectral energy distributions (SEDs) with galacto-centric distance. Detailed SED modeling is performed using azimuthally averaged fluxes elliptical rings 2 kpc width, out 8 Simple isothermal two-component grey body...
The aim of this paper is to revisit the calculation atom-surface quantum friction in field theory formulation put forward by Barton (2010 New J. Phys. 12 113045). We show that power dissipated into excitations and associated force depend on how atom boosted from being initially at rest a configuration which it moving constant velocity (v) parallel planar interface. In addition, we point out there subtle cancellation between one-photon part two-photon dissipating power, resulting leading...
We study the electromagnetic coupling and concomitant heating of a particle in miniaturized trap close to solid surface. Two dominant mechanisms are identified: proximity fields generated by thermally excited currents absorbing time-dependent image potentials due elastic surface distortions (Rayleigh phonons). Estimates for lifetime ground state given. Ions particularly sensitive electric fields: silver substrate, we find below one second at distances closer than some ten micrometer Neutral...
We analyze the equilibrium properties of a weakly interacting, trapped quasi-one-dimensional Bose gas at finite temperatures and compare different theoretical approaches. focus in particular on two stochastic theories: number-conserving Bogoliubov (NCB) approach Gross-Pitaevskii equation (SGPE) that have been extensively used numerical simulations. Equilibrium like density profiles, correlation functions, condensate statistics are compared to predictions based upon number alternative...
The electromagnetic force on a polarizable particle is calculated in covariant framework. Local equilibrium temperatures for the field and particle's dipole moment are assumed, using relativistic formulation of fluctuation–dissipation theorem. Two examples illustrate radiative friction forces: moving through homogeneous radiation background above planar interface. Previous results arbitrary relative velocities recovered compact way.
Recent progress in manipulating atomic and condensed matter systems has instigated a surge of interest non-equilibrium physics, including many-body dynamics trapped ultracold atoms ions, near-field radiative heat transfer, quantum friction. Under most circumstances the complexity such requires number approximations to make theoretical descriptions tractable. In particular, it is often assumed that spatially separated components system thermalize with their immediate surroundings, although...
We present a formalism based on first principles of quantum electrodynamics at nonzero temperature which permits us to calculate the Casimir-Polder interaction between an atom and graphene sheet with arbitrary mass gap chemical potential, including graphene-coated substrates. The free energy force are expressed via polarization tensor in $(2+1)$-dimensional space-time framework Dirac model. obtained expressions used investigate influence potential interaction. Computations performed for...
The electric-field noise above a layered structure composed of planar metal electrode covered by thin dielectric is evaluated and it found that the film considerably increases level, in proportion to its thickness. Importantly, even (mono) layer low-loss can enhance level several orders magnitude compared bare metal. Close this surface, power spectral density electric field varies with inverse fourth distance rather than square, as would surface. Furthermore, clean metal, where spectrum does...
We discuss the failure of Markov approximation in description atom-surface fluctuation-induced interactions, both equilibrium (Casimir-Polder forces) and out (quantum friction). Using general theoretical arguments, we show that can lead to erroneous predictions such phenomena with regard strength functional dependencies on system parameters. In particular, long-time power-law tails two-time dipole correlations their corresponding low-frequency behavior, neglected Markovian limit, affect...
We consider light propagation in a finite photonic crystal. The transmission and reflection from one-dimensional system are described an effective medium theory, which reproduces exactly the results of transfer matrix calculations. derive simple formulas for semi-infinite crystal, local density states absorbing crystals, discuss defect modes negative refraction.