2020

Modeling electromagnetic resonators using quasinormal modes
P.T. Kristensen, K. Herrmann, F. Intravaia, and K. Busch (2020)
Advances in Opics and Photonics 12:612

We present a biorthogonal approach for modeling the response of localized electromagnetic resonators using quasinormal modes, which represent the natural, dissipative eigenmodes of the system...

On the applicability of quantum-optical concepts in strong-coupling nanophotonics
C. Tserkezis, A. I. Fernandez-Dominguez, P. A. D. Goncalves, F. Todisco, J. D. Cox, K. Busch, N. Stenger, S. I. Bozhevolnyi, N. A. Mortensen, and C. Wolff (2020)
Reports on Progress in Physics 83:82401

Rooted in quantum optics and benefiting from its well-established foundations, strong coupling in nanophotonics has experienced increasing popularity in recent years. With nanophotonics being an...

Dispersion control in a near-infrared subwavelength resonator with a tailored hyperbolic metamaterial
E. Travkin, T. Kiel, S. Sadofev, S. Kalusniak, K. Busch, and O. Benson (2020)
Optics Letters 45:3665

We demonstrate experimentally and computationally an intricate cavity size dependence of the anomalous near-infrared mode spectrum of an ordinary optical resonator that is combined with a ZnO:Ga...

Multiphoton synthetic lattices in multiport waveguide arrays: synthetic atoms and Fock graphs
K. Tschernig, R. de J. Leon-Montiel, A. Perez-Leija, and K. Busch (2020)
Photonics Research 8:1161

Activating transitions between internal states of physical systems has emerged as an appealing approach to create lattices and complex networks. In such a scheme, the internal states or modes of...

Nonadditive Enhancement of Nonequilibrium Atom-Surface Interactions
D. Reiche, K. Busch, and F. Intravaia (2020)
Physics Review Letters 124:193603

The motion-induced drag force acting on a particle moving parallel to an arrangement of N objects is analyzed. Particular focus is placed on the nonequilibrium statistics of the interaction and...

Importance of substrates for the visibility of "dark" plasmonic modes
S. Fiedler, S. Raza, R. Ai, J. Wang, K. Busch, N. Stenger, N.A. Mortensen, and C. Wolff (2020)
Optics Express 28:13938

Dark plasmonic modes have interesting properties, including longer lifetimes and narrower linewidths than their radiative counterpart, and little to no radiative losses. However, they have not...

Broadband Spectrometer with Single-Photon Sensitivity Exploiting Tailored Disorder
W. Hartmann, P. Varytis, H. Gehring, N. Walter, F. Beutel, K. Busch, and W.H.P. Pernice (2020)
Nano Letters 20:2625

Harnessing tailored disorder for broadband light scattering enables high-resolution signal analysis in nanophotonic spectrometers with a small device footprint. Multiple scattering events in the...

Topological protection in non-Hermitian Haldane honeycomb lattices
P. Reséndiz-Vázquez, K. Tschernig, A. Perez-Leija, K. Busch, and Roberto de J. León-Montiel (2020)
Physical Review Research 2:013387

Topological phenomena in non-Hermitian systems have recently become a subject of great interest in the photonics and condensed-matter communities. In particular, the possibility of observing...

Waveguide-Integrated Broadband Spectrometer Based on Tailored Disorder
W. Hartmann, P. Varytis, H. Gehring, N. Walter, F. Beutel, K. Busch, and W.H.P. Pernice (2020)
Advanced Optical Materials 8:1901602

Compact, on-chip spectrometers exploiting tailored disorder for broadband light scattering enable high-resolution signal analysis while maintaining a small device footprint. Due to multiple...

Composition analysis and transition energies of ultrathin Sn-rich GeSn quantum wells
I.A. Fischer, C.J. Clausen, D. Schwarz, P. Zaumseil, G. Capellini, M. Virgilio, M.C. da Silva Figueira, S. Birner, S. Koelling, P.M. Koenraad, M.R.S. Huang, C.T. Koch, T. Wendav, K. Busch, and J. Schulze (2020)
Physical Review Materials 4:024601

While GeSn alloys with high Sn content constitute direct group-IV semiconductors, their growth on Si remains challenging. The deposition of a few monolayers of pure Sn on Ge and their overgrowth...

Negative asymmetry parameter in plasmonic core-shell nanoparticles
P. Varytis and K. Busch (2020)
Optics Express 28:1714

Plasmonic nanoparticles with a dielectric-metal core-shell morphology exhibit hybridized modes where the surface plasmon polaritons at the outer and inner surfaces of the shell couple. We...

Quantum thermodynamics of overdamped modes in local and spatially dispersive materials
D. Reiche, K. Busch, and F. Intravaia (2020)
Physical Review A 101:012506

The quantum thermodynamical properties of (quasinormal) overdamped electromagnetic modes (eddy currents) are investigated in the context of the magnetic Casimir-Polder interaction. The role of...

2019

Mode-independent quantum entanglement for light
J. Sperling, A. Perez-Leija, K. Busch, and C. Silberhorn (2019)
Physical Review A 100:062129

We address the problem of the persistence of entanglement of quantum light under mode transformations, where orthogonal modes define the parties between which quantum correlations can occur....

Polaritonic contribution to the Casimir energy between two graphene layers
C. H. Egerland, K. Busch, and F. Intravaia (2019)
Physical Review B 100:235418

We study the role of surface polaritons in the zero-temperature Casimir effect between two graphene layers that are described by the Dirac model. A parametric approach allows us to accurately...

Multiphoton quantum-state engineering using conditional measurements
O. S. Magaña-Loaiza, R. de J. León-Montiel, A. Perez-Leija, A. B. U’Ren, C. You, K. Busch, A. E. Lita, S. W. Nam, R. P. Mirin, and T. Gerrits (2019)
Nature Partner Journals (npj): Quantum Information 5:80

The quantum theory of electromagnetic radiation predicts characteristic statistical fluctuations for light sources as diverse as sunlight, laser radiation, and molecule fluorescence. Indeed,...

Quantum Rolling Friction
F. Intravaia, M. Oelschläger, D. Reiche, D. A. R. Dalvit, and K. Busch (2019)
Physical Review Letters 123:120401

An atom moving in a vacuum at constant velocity and parallel to a surface experiences a frictional force induced by the dissipative interaction with the quantum fluctuations of the...

Single-step fabrication of surface waveguides in fused silica with few-cycle laser pulses
F. F. Furch, W. D. Engel, T. Witting, A. Perez-Leija, M. J. J. Vrakking, and A. Mermillod-Blondin (2019)
Optics Letters 44:4267

Direct laser writing of surface waveguides with ultrashort pulses is a crucial achievement towards all-laser manufacturing of photonic integrated circuits sensitive to their environment. In this...

Exceptional points of any order in a single, lossy waveguide beam splitter by photon-number-resolved detection
Mario A. Quiroz-Juarez, Armando Perez-Leija, Konrad Tschernig, Blas M. Rodríguez-Lara, Omar S. Magana-Loaiza, Kurt Busch, Yogesh N. Joglekar, and Roberto de J. Leon-Montiel (2019)
Photonics Research 7:862

Exceptional points (EPs) are degeneracies of non-Hermitian operators where, in addition to the eigenvalues, the corresponding eigenmodes become degenerate. Classical and quantum photonic systems...

Two-particle quantum correlations in stochastically-coupled networks
R. de J. Leon-Montiel, V. Mendez, M. A. Quiroz-Juarez, A. Ortega, L. Benet, A. Perez-Leija, and K. Busch (2019)
New Journal of Physics 21:053041

Quantum walks in dynamically-disordered networks have become an invaluable tool for understanding the physics of open quantum systems. Although much work has been carried out considering...

Quantization of Quasinormal Modes for Open Cavities and Plasmonic Cavity Quantum Electrodynamics
S. Franke, S. Hughes, M.K. Dezfouli, P.T. Kristensen, K. Busch, A. Knorr, and M. Richter (2019)
Physical Review Letters 122:213901

We introduce a second quantization scheme based on quasinormal modes, which are the dissipative modes of leaky optical cavities and plasmonic resonators with complex eigenfrequencies. The theory...

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