2017

Mid-infrared beam splitter for ultrashort pulses
C. Somma, K. Reimann, M. Woerner, T. Kiel, K. Busch, A. Braun, M. Matalla, K. Ickert, and O. Krüger (2017)
Optics Letters 42: 2918
A design is presented for a beam splitter suitable for ultrashort pulses in the mid-infrared and terahertz spectral range consisting of a structured metal layer on a diamond substrate. Both the...
Near-field study on the transition from localized to propagating plasmons on 2D nano-triangles
T. Weber, T. Kiel, S. Irsen, K. Busch, and S. Linden (2017)
Optics Express 25:16947
In this manuscript we report on a near field study of two-dimensional plasmonic gold nano-triangles using electron energy loss spectroscopy in combination with scanning transmission electron...
Limitations of Particle-Based Spasers
G. Kewes, K. Herrmann, R. Rodríguez-Oliveros, A. Kuhlicke, O. Benson, and K. Busch (2017)
Physical Review Letters 118:237402
We present a semiclassical analytic model for spherical core-shell surface plasmon lasers. Within this model, we drop the widely used one-mode approximations in favor of fully electromagnetic Mie...
Spatial dispersion in atom-surface quantum friction
D. Reiche, D. A. R. Dalvit, K. Busch, and F. Intravaia (2017)
Physical Review B 95:155448
We investigate the influence of spatial dispersion on atom-surface quantum friction. We show that for atom-surface separations shorter than the carrier’s mean free path within the material, the...

2016

Photoluminescence from ultrathin Ge-rich multiple quantum wells observed up to room temperature: Experiments and modeling
T. Wendav, I.A. Fischer, M. Virgilio, G. Capellini, F. Oliveira, M.F. Cerqueira, A. Benedetti, S. Chiussi, P. Zaumseil, B. Schwartz, K. Busch, and J. Schulze (2016)
Physical Review B 94:245304
Employing a low-temperature growth mode, we fabricated ultrathin Si1−x Gex /Si multiple quantum well structures with a well thickness of less than 1.5 nm and a Ge concentration above 60% directly on...
Non-Markovianity in atom-surface dispersion forces
F. Intravaia, R. O. Behunin, C. Henkel, K. Busch, and D. A. R. Dalvit (2016)
Physical Review A 94:042114
We discuss the failure of the Markov approximation in the description of atom-surface fluctuation-induced interactions, both in equilibrium (Casimir-Polder forces) and out of equilibrium (quantum...
Failure of Local Thermal Equilibrium in Quantum Friction
F. Intravaia, R. O. Behunin, C. Henkel, K. Busch, and D. A. R. Dalvit (2016)
Physical Review Letters 117:100402

Recent progress in manipulating atomic and condensed matter systems has instigated a surge of interest in nonequilibrium physics, including many-body dynamics of trapped ultracold atoms and ions,...

Dimensional transformation of defect-induced noise, dissipation, and nonlinearity
R. O. Behunin, F. Intravaia, and P. T. Rakich (2016)
Physical Review B 93:224110
In recent years, material-induced noise arising from defects has emerged as an impediment to quantum-limited measurement in systems ranging from microwave qubits to gravity wave interferometers. As...
Nonequilibrium Casimir-Polder plasmonic interactions
N. Bartolo, R. Messina, D. A. R. Dalvit, and F. Intravaia (2016)
Physical Review A 93:042111
We investigate how the combination of nonequilibrium effects and material properties impacts on the Casimir-Polder interaction between an atom and a surface. By addressing systems with temperature...
Surface-plasmon-polariton hybridized cavity modes in submicrometer slits in a thin Au film
Walther, R, Fritz, S, Müller, E, Schneider, T, Maniv, T, Cohen, H, Matyssek, C, Busch, K, and Gerthsen, D (2016)
Physical Review B 93:245417
The excitation of cavity standing waves in double-slit structures in thin gold films, with slit lengths between 400 and 2560 nm, was probed with a strongly focused electron beam in a transmission...
Compositonal dependence of the band-gap of Ge(1-x-y) Si(x) Sn(y) alloys
Wendav, T, Fischer, IA, Montanari, M, Zoellner, MH, Klesse, W, Capellini, G, von_den_Driesch, N, Oehme, M, Buca, D, Busch, K, and Schulze, J (2016)
Applied Physics Letters 108:242104
The group-IV semiconductor alloy Ge(1−x−y) Si(x) Sn(y) has recently attracted great interest due to its prospective potential for use in optoelectronics, electronics, and photovoltaics. Here, we...
Structure-induced resonant tail-state regime absorption in polymer: fullerene bulk-heterojunction solar cells
Pfadler, T, Kiel, T, Stärk, M, Werra, JFM, Matyssek, C, Sommer, D, Boneberg, J, Busch, K, Weickert, J, and Schmidt-Mende, L (2016)
Physical Review B 93:205305
On this work, we present resonant tail-state regime absorption enhanced organic photovoltaics. We combine periodically structured TiO2 bottom electrodes with P3HT-PCBM bulk-heterojunction solar cells...
Coupling of Surface-Plasmon-Polariton-Hybridized Cavity Modes between Submicron Slits in a Thin Gold Film
Walther, R, Fritz, S, Müller, E, Schneider, R, Gerthsen, D, Sigle, W, Maniv, T, Cohen, H, Matyssek, C, and Busch, K (2016)
ACS Photonics 3:836
Electron energy loss spectroscopy (EELS) in a monochromated transmission electron microscope is applied to probe standing-wave-like cavity modes hybridized with surface plasmon polaritons (SPP) in...
Ultrafast three-wave-mixing in plasmonic nanostructures
Huynh, D, Moeferdt, M, Matyssek, C, Wolff, C, and Busch, K (2016)
Applied Physics B 122:139
We present a perturbative approach to the time-domain computation of three-wave-mixing signals from plasmonic nanostructures. Based on a hydrodynamic material model which features nonlinear as well...
Determining graphene's induced band gap with magnetic and electric emitters
Werra, JFM, Krüger, P, Busch, K, and Intravaia, F (2016)
Physical Review B 93:081404(R)
We present numerical and analytical results for the lifetime of emitters in close proximity to graphene sheets. Specifically, we analyze the contributions from different physical channels that...
TE resonances in graphene-dielectric structures
Werra, JFM, Intravaia, F, and Busch, K (2016)
Journal of Optics 18:034001
We investigate the dispersion relations of TE resonances in different graphene-dielectric structures. Previous work has shown that when a graphene layer is brought into contact with a dielectric...
Second Harmonic Generation from Metal Nano-Particle Resonators: Numerical Analysis On the Basis of the Hydrodynamic Drude Model
Hille, A, Moeferdt, M, Wolff, C, Matyssek, C, Rodriguez-Oliveros, R, Prohm, C, Niegemann, J, Grafström, S, Eng, LM, and Busch, K (2016)
Journal of Physical Chemistry C 120:1163
A detailed computational study of the wavelength-dependent efficiency of optical second-harmonic generation in plasmonic nanostructures is presented. The computations are based on a discontinuous...
Green's-function formalism for waveguide QED applications
Schneider, MP, Sproll, T, Stawiarski, C, Schmitteckert, P, and Busch,K (2016)
Physical Review A 93:013828
We present a quantum-field-theoretical framework based on path integrals and Feynman diagrams for the investigation of the quantum-optical properties of one-dimensional waveguiding structures with...

2015

Growth and characterization of SiGeSn quantum well photodiodes
Fischer, I, Wendav, T, Augel, L, Jitpakdeebodin, S, Oliveira, F, Benedetti, A, Stefanov, S, Chiussi, S, Capellini, G, Busch, K, and Schulze, J (2015)
Optics Express 23:25048
We report on the fabrication and electro-optical characterization of SiGeSn multi-quantum well PIN diodes. Two types of PIN diodes, in which two and four quantum wells with well and barrier...
Real-space imaging of nanotip plasmons using electron energy loss spectroscopy
Schröder, B, Weber, T, Yalunin, SV, Kiel, T, Matyssek, C, Sivis, M, Schäfer, S, vonCube, F, Irsen, S, Busch, K, Ropers, C, and Linden, S (2015)
Physical Review B 92:085411
We report the spatial mapping of surface plasmons on conical gold nanotips by electron energy loss spectroscopy. We observe standing-wave patterns resulting from reflections of the fundamental...
Electroluminescence of GeSn/Ge MQW LEDs on Si substrate
Bernhard Schwartz, Michael Oehme, Konrad Kostecki, Daniel Widmann, Martin Gollhofer, Roman Koerner, Stefan Bechler, Inga A. Fischer, Torsten Wendav, Erich Kasper, Jörg Schulze, and Martin Kittler (2015)
Optics Letters 40:3209
Multi-quantum well light-emitting diodes, consisting of ten alternating GeSn/Ge-layers, were grown by molecular beam epitaxy on Si. The Ge barriers were 10 nm thick, and the GeSn wells were grown...
Fluorescence in nonlocal dissipative periodic structures
Intravaia, F and Busch, K (2015)
Physical Review A 91:053836
We present an approach for the description of fluorescence from optically active materials embedded in layered periodic structures. Based on an exact electromagnetic Green's tensor analysis, we...
Friction forces on atoms after acceleration
Intravaia, F, Mkrtchian, VE, Buhmann, SY, Scheel, S, Dalvit, DAR, and Henkel, C (2015)
Journal of Physics: Condensed Matter 27:214020
The aim of this paper is to revisit the calculation of atom–surface quantum friction in the quantum field theory formulation put forward by Barton (2010 New J. Phys. 12 113045). We show that the...
Current sheets in the Discontinuous Galerkin Time-Domain method: an application to graphene
J FM Werra, C Wolff, C Matyssek, and K Busch (2015)
Proceedings of SPIE 9502, Metamaterials X, 95020E
We describe the treatment of thin conductive sheets within the Discontinuous Galerkin Time-Domain (DGTD) method for solving the Maxwell equations and apply this approach to the efficient computation...
Efficient multiple time-stepping algorithms of higher order
Demirel, A, Niegemann, J, Busch, K, and Hochbruck, M (2015)
Journal of Computational Physics 285:133
Multiple time-stepping (MTS) algorithms allow to efficiently integrate large systems of ordinary differential equations, where a few stiff terms restrict the timestep of an otherwise non-stiff system...

2014

Frequency-Resolved Reciprocal-Space Mapping of Visible Spontaneous Emission from 3D Photonic Crystals
Froehlich, O, Fischer, J, Wolff, C, Busch, K, and Wegener, M (2014)
Advanced Optical Materials 2:849
Information on propagating and evanescent Bloch modes as well as on remaining disorder is provided by experiments on titania woodpile photonic crystals with a complete three-dimensional photo­nic...
Quantum friction and fluctuation theorems
F. Intravaia, R. O. Behunin, and D. A. R. Dalvit (2014)
Physical Review A 89:050101(R)
We use general concepts of statistical mechanics to compute the quantum frictional force on an atom moving at constant velocity above a planar surface. We derive the zero-temperature frictional force...
Spoof polariton enhanced modal density of states in planar nanostructured metallic cavities
P. S. Davids, F. Intravaia, and D.A.R. Dalvit (2014)
Optics Express 22:12424
Spoof surface modes on nanostructured metallic surfaces are known to have tailorable dispersion dependent on the geometric characteristics of the periodic pattern. Here we examine the spoof plasmon...
Disordered photonic crystals: a cluster coherent potential approach using photonic Wannier functions
Koehl, M, Wolff, C, and Busch, K (2014)
Journal of the Optical Society of America B 31:2246
We present a cluster coherent potential approach for disordered photonic crystals (PhCs) that is based on maximally localized Wannier functions. In particular, the Wannier basis facilitates an...
Scanning Single Quantum Emitter Fluorescence Lifetime Imaging: Quantitative Analysis of the Local Density of Photonic States
Schell, A, Engel, P, Werra, J, Wolff, C, Busch, K, and Benson, O (2014)
Nano Letters 14:2623
Their intrinsic properties render single quantum systems as ideal tools for quantum enhanced sensing and microscopy. As an additional benefit, their size is typically on an atomic scale that enables...
Interslit Coupling via Ultrafast Dynamics across Gold-Film Hole Arrays
Walther, R, Carmeli, I, Schneider, R, Gerthsen, D, Busch, K, Matyssek, C, Shvarzman, A, Maniv, T, Richter, S, and Hagai, C (2014)
Journal of Physical Chemistry C 118:11043
One-dimensional arrays of submicrometer rectangular holes in 200 nm thin gold films are investigated using electron energy loss spectroscopy combined with scanning transmission electron microscopy (...

2013

Quantitative spectroscopy on individual wire, slot, bow-tie, rectangular, and square-shaped optical antennas
Husnik, M, Niegemann, J, Busch, K, and Wegener, M (2013)
Optics Letters 38:4597
By using a recently introduced approach combining a focus-modulation technique with a common-path interferometer, we measure quantitatively the extinction, scattering, and absorption cross-section...
Mode structure and polaritonic contributions to the Casimir effect in a magnetodielectric cavity
Harald R. Haakh and Francesco Intravaia (2013)
Physical Review A 88:052503
We present a full analysis of the mode spectrum in a cavity formed by two parallel plates, one of which is magnetodielectric (metamaterial) while the other one is metallic, and obtain dispersion...
Comparison of electron energy-loss and quantitative optical spectroscopy on individual optical gold antennas
Husnik M, von C F, Irsen S, Linden S, Niegemann J, Busch K, and Wegener M (2013)
Nanophotonics 2:241
Using a rather large set of different individual metallic optical antennas, we compare directly measured electron energy-loss spectra with measured quantitative optical extinction and scattering...
Correlated photons in one-dimensional waveguides
Matthias Moeferdt, Peter Schmitteckert, and Kurt Busch (2013)
Optics Letters 38:3693
We study two-photon transport in a one-dimensional waveguide with a side-coupled two-level system. Depending on the momentum of the incoming photons, we find that the nature of the scattering process...
Photon transport in one-dimensional systems coupled to three-level quantum impurities
Christoph Martens, Paolo Longo, and Kurt Busch (2013)
New Journal of Physics 15:083019
We discuss the transport properties of a single photon in a one-dimensional waveguide with an embedded three-level atom and utilize both stationary plane-wave solutions and time-dependent transport...
Abandoned Functionality of Thin-Film Opal Photonic Crystals
Küchenmeister, J, Wolff, C, Busch, K, Peschel, U, and Romanov, S (2013)
Advanced Optical Materials 12:952
Angle-resolved polarized transmission spectra of thin-film opals are studied experimentally and theoretically as a function of the azimuthal rotation of the plane of incidence at different angles of...
Generation of Wannier functions for photonic crystals
Christian Wolff, Patrick Mack, and Kurt Busch (2013)
Physical Review B 88:075201
We present an approach for the efficient generation of Wannier functions for Photonic Crystal computations that is based on a combination of group-theoretical analysis and efficient minimization...
Titania woodpiles with complete three-dimensional photonic bandgaps in the visible
Andreas Frölich, Joachim Fischer, Thomas Zebrowski, Kurt Busch, and Martin Wegener (2013)
Advanced Materials 25:3588
Titania woodpile photonic crystals are fabricated by a combination of stimulated-emission depletion direct laser writing and a novel titania double-inversion procedure. The procedure relies on atomic...
Strongly coupled slow-light polaritons in one-dimensional disordered localized states
Jie Gao, Sylvain Combrie, Baolai Liang, Peter Schmitteckert, Gaelle Lehoucq, Stephane Xavier, XinAn Xu, Kurt Busch, Diana L Huffaker, Alfredo De Rossi, and Chee W Wong (2013)
Scientific Reports 3:1994
Cavity quantum electrodynamics advances the coherent control of a single quantum emitter with a quantized radiation field mode, typically piecewise engineered for the highest finesse and confinement...
Spectra of coherent resonant light pulses interacting with a two-level atom in a waveguide
Julia FM Werra, Paolo Longo, and Kurt Busch (2013)
Physical Review A 87:063821
We present a theoretical analysis of the spectral features of coherent light pulses traveling in a one-dimensional waveguide with an embedded two-level quantum system. In particular, we clarify and...
B-spline modal method: A polynomial approach compared to the Fourier modal method
Michael Walz, Thomas Zebrowski, Jens Küchenmeister, and Kurt Busch (2013)
Optics Express 21:14683
A detailed analysis of the B-spline Modal Method (BMM) for one- and two-dimensional diffraction gratings and a comparison to the Fourier Modal Method (FMM) is presented. Owing to its intrinsic...
Simple magneto-optic transition metal models for time-domain simulations
C. Wolff, R. Rodriguez-Oliveros, and K. Busch (2013)
Optics Express 21:12022
Efficient modelling of the magneto-optic effects of transition metals such as nickel, cobalt and iron is a topic of growing interest within the nano-optics community. In this paper, we present a...
In situ observation of plasmon tuning in a single gold nanoparticle during controlled melting
A. Kuhlicke, S. Schietinger, C. Matyssek, K. Busch, and O. Benson (2013)
Nano Letters 13:2041
In this Letter we study the relations among shape, symmetry, and plasmon resonance shift in a single gold nanoparticle during laser melting. A beam of an argon ion laser is focused on a selected...
A low-cost AFM setup with an interferometer for undergraduates and secondary-school students
A. Bergmann, D. Feigl, D. Kuhn, M. Schaupp, G. Quast, K. Busch, L. Eichner, and J. Schumacher (2013)
European Journal of Physics 34:901
Atomic force microscopy (AFM) is an important tool in nanotechnology. This method makes it possible to observe nanoscopic surfaces beyond the resolution of light microscopy. In order to provide...
Quantum Bocce: Magnon–magnon collisions between propagating and bound states in 1D spin chains
P. Longo, A. D Greentree, K. Busch, and J. H Cole (2013)
Physics Letters A 377:1242
The dynamics of two magnons in a Heisenberg spin chain under the influence of a non-uniform magnetic field is investigated by means of a numerical wave-function-based approach using a Holstein–...
Modeling spontaneous emission control in photonic crystals by ferromagnetic resonance
U. Hoeppe, C. Wolff, H. Benner, and K. Busch (2013)
IEEE Transactions on Magnetics 49:1013
The radiation dynamics of a magnetic dipole located inside a photonic crystal has been considered as an analogue for optical emission of a point-like emitter in such a crystal. We have experimentally...
Direct transcription of two-dimensional colloidal crystal arrays into three-dimensional photonic crystals
A. Vlad, A. Frölich, T. Zebrowski, C. A Dutu, K. Busch, S. Melinte, M. Wegener, and I. Huynen (2013)
Advanced Functional Materials 23:1164
A simple protocol for the fabrication of three-dimensional (3D) photonic crystals in silicon is presented. Surface structuring by nanosphere lithography is merged with a novel silicon etching method...
From isolated metaatoms to photonic metamaterials: evolution of the plasmonic near-field
F. von Cube, S. Irsen, R. Diehl, J. Niegemann, K. Busch, and S. Linden (2013)
Nano Letters 13:703
Metamaterials are artificial media which can provide optical properties not available from natural materials. These properties often result from the resonant excitation of plasmonic modes in the...
Design and numerical optimization of an easy-to-fabricate photon-to-plasmon coupler for quantum plasmonics
G. Kewes, A. W Schell, R. Henze, R. S Schönfeld, S. Burger, K. Busch, and O. Benson (2013)
Applied Physics Letters 102:051104
We design an on-chip single mode photon to surface-plasmon coupler. Our coupler consists of a tapered dielectric waveguide and a V-shaped plasmonic part. In contrast to other concepts designated to...

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