2021

Topological protection of highly entangled non-Gaussian two-photon states
K. Tschernig, R. Lo Franco, M. Ivanov, M.A. Bandres, K. Busch, and A. Perez-Leija (2021)
Materials for Quantum Technology 1:035001

We study theoretically the evolution of entangled non-Gaussian two-photon states in disordered topological lattices. Specifically, we consider spatially entangled two-photon states, modulated by...

Entangled two-photon absorption spectroscopy with varying pump wavelengths
L. Mertenskötter, K. Busch, and R. de de J. León-Montiel (2021)
Journal of the Optical Society of America B 38:C63

In entangled two-photon absorption (eTPA) spectroscopy, information about the energy-level structure of an arbitrary sample is retrieved by Fourier transforming sets of measured two-photon...

Topological protection versus degree of entanglement of two-photon light in photonic topological insulators
K. Tschernig, A, Jimenez-Galan, D.N. Christodoulides, M. Ivanov, K. Busch, M.A. Bandres, and A. Perez-Leija (2021)
Nature Communications 12:1974

Topological insulators combine insulating properties in the bulk with scattering-free transport along edges, supporting dissipationless unidirectional energy and information flow even in the...

Additive splitting methods for parallel solutions of evolution problems
S. Amiranashvili, M. Radziunas, U. Bandelow, K. Busch, and R. Ciegis (2021)
Journal of Computational Physics 436:110320

We demonstrate how a multiplicative splitting method of order P can be utilized to construct an additive splitting method of order P+3. The weight coefficients of the additive...

Enhanced Faraday rotation by dielectric metasurfaces with Bayesian shape-optimized scatterers
T: Kiel, P. Varytis, B. Beverungen, P.T. Kristensen, and K. Busch (2021)
Optics Letters 46:1720

In this Letter,we demonstrate howto optimize the magneto–optic response of a Huygens metasurface composed of square arrays of all-dielectric nano-disk scatterers.We compare cylindrical and shape...

Electron energy loss spectroscopy on freestanding perforated gold films
M. Prämassing, T. Kiel, S. Irsen, K. Busch, and S. Linden (2021)
Physical Review B 103:115403

We report on a combined far- and near-field study of surface plasmon polaritons on freestanding perforated gold films. The samples were fabricated by focused ion beam milling of a periodic hole...

Defect-State Lasing in Photonic Lattices of Metal–Organic Microcavities
M. Kliem, T. Kiel, M. Kück, S. Meister, A. Mischok, H. Fröb, K. Busch, and K. Leo (2021)
Advanced Photonics Research 2:2000116

Photonic band structure engineering has developed into an important technique for controlling the emission and interaction of photons and polaritons in microcavities (MCs). Herein, lasing from...

2020

Nonequilibrium thermodynamics of quantum friction
D. Reiche, F. Intravaia, J.-T. Hsiang, K. Busch, and B.L. Hu (2020)
Physical Review A (rapid) 102:050203

Thermodynamic principles are often deceptively simple and yet surprisingly powerful.We show how a simple rule, such as the net flow of energy in and out of a moving atom under a nonequilibrium...

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)
Physical 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...

Identification of light sources using machine learning
C. You, M.A. Quiroz-Juarez, A. Lambert, M. Bhusal, C. Dong, A. Perez-Leija, A. Javaid, R. de J. Leon-Montiel, and O.S. Magana-Loaiza (2020)
Applied Physics Reviews 7:021404
The identification of light sources represents a task of utmost importance for the development of multiple photonic technologies. Over 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...

Non-adiabatic dynamic-phase-free geometric phase in multiport photonic lattices
K. Wang, A. Perez-Leija, S. Weimann, and A. Szameit (2020)
Journal of Optics 22:035801

We theoretically show that multiport photonic lattices emulating driven quantum harmonic oscillators give rise to Aharonov–Anandan geometric phase, which is proportional to the associated...

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