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
A. Demirel, J. Niegemann, K. Busch, and M. Hochbruck (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...

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...

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