2023

Spectroscopic Study of the Excitonic Structure in Monolayer MoS2 under Multivariate Physical and Chemical Stimuli
V. Bender, T. Bucher, M.N. Mischuk, Y. Xie, I. Staude, F. Eilenberger, K. Busch, T. Pertsch, and B.N. Tugchin (2023)
physica status solidi (a) 2300113

Photoluminescence (PL) spectroscopy has proven to provide deep insights into the optoelectronic properties of monolayer MoS2. Herein, a corresponding study is conducted on the excitonic...

Optical convolutional neural network with atomic nonlinearity
M. Yang, E. Robertson, L. Esguerra, K. Busch, and Y. Wolters (2023)
Optics Express 31:16451

Due to their high degree of parallelism, fast processing speeds and low power consumption, analog optical functional elements offer interesting routes for realizing neuromorphic computer...

Halevi's extension of the Euler-Drude model for plasmonic systems
G. Wegner, D. Huynh, N.A. Mortensen, F. Intravaia, and K. Busch (2023)
Physical Review B 107:115425

The nonlocal response of plasmonic materials and nanostructures is often described within a hydrodynamic approach, which is based on the Euler-Drude equation. In this paper, we reconsider this...

Localization effects from local phase shifts in the modulation of waveguide arrays
K. Tschernig, A. Perez-Leija, and K. Busch (2023)
Journal of the Optical Society of America B 40:B41

Artificial gauge fields enable the intriguing possibility to manipulate the propagation of light as if it were under the influence of a magnetic field even though photons possess no intrinsic...

Coherent dimension reduction with integrated photonic circuits exploiting tailored disorder
D. Wendland, M. Becker, F. Brückerhoff-Plückelmann, I. Bente, K. Busch, B. Risse, and W.H.P. Pernice (2023)
Journal of the Optical Society of America B 40:B35

The number of systems that are investigated for computation in the physical domain has increased substantially in the recent past. Optical and photonic systems have drawn high interest due to...

Surface roughness in finite-element meshes: application to plasmonic nanostructures
F. Loth, T. Kiel, K. Busch, and P.T. Kristensen (2023)
Journal of the Optical Society of America B 40:B1

Photonic and plasmonic nanostructures almost unavoidably exhibit some degree of surface roughness for which the details depend on the fabrication process. A corresponding quantitative modeling...

Resolvent expansion for discrete non-Hermitian resonant systems [Invited]
L. Simonson, Ş. K. Özdemir, K. Busch, and R. El-Ganainy (2023)
Optical Materials Express 13:229

The linear response of non-Hermitian resonant systems demonstrates various intriguing features such as the emergence of non-Lorentzian lineshapes. Recently, we have developed a systematic theory...

2022

Two-particle tight-binding description of higher-harmonic generation in semiconductor nanostructures
U. Peschel, M. Thümmler, T. Lettau, S. Gräfe, and K. Busch (2022)
Physical Review B 106:245307

We develop a quantum mechanical theory to describe the optical response of semiconductor nanostructures with a particular emphasis on higher-order harmonic generation. Based on a tight-binding...

Uniform optical gain as a non-Hermitian control knob
A. Hashemi, K. Busch, Ş. K. Özdemir, and R. El-Ganainy (2022)
Physical Review Research 4:043169

Non-Hermitian optics utilizes judicious engineering of the spatial and spectral distribution of gain and loss in order to tailor the behavior of photonic systems in ways that could not be...

Electromagnetic viscosity in complex structured environments: From blackbody to quantum friction
M. Oelschläger, D. Reiche, C. H. Egerland, K. Busch, and F. Intravaia (2022)
Physical Review A 106:052205

We investigate the steady-state nonconservative open-system dynamics of an atom in a generic complex structured electromagnetic environment at finite temperature...

The missing link between standing- and traveling-wave resonators
Q. Zhong, H. Zhao, L. Feng, K. Busch, Ş. K. Özdemir, and R. El-Ganainy (2022)
Nanophotonics 11:4427

Optical resonators are structures that utilize wave interference and feedback to confine light in all three dimensions. Depending on the feedback mechanism, resonators can support either...

Branching High-Order Exceptional Points in Non-Hermitian Optical Systems
K. Tschernig, K. Busch, D.N. Christodoulides, and A. Perez-Leija (2022)
Laser & Photonics Reviews 16:2100707
Exceptional points are complex-valued spectral singularities that lead to a host of intriguing features such as loss-induced transparency—a counterintuitive process in which an increase in the...
Linear response theory of open systems with exceptional points
S. Hashemi, K. Busch, D.N. Christodoulides, S.K. Ozdemir, and R. El-Ganainy (2022)
Nature Communications 13:3281

Understanding the linear response of any system is the first step towards analyzing its linear and nonlinear dynamics, stability properties, as well as its behavior in the presence of noise. In...

Quantum-inspired multicore optical fiber
A. Kalita, Q. Zhong, K. Busch, and R. El-Ganainy (2022)
Optics Letters 47:2526

We introduce a new, to the best of our knowledge, type of multicore optical fiber having a quantum-inspired network topology and unique spectral features. Particularly, the connectivity between...

In der Unruhe liegt die Kraft
F. Intravaia, D. Reiche, und K. Busch (2022)
Physik Journal 21:35

Fluktuationen sind allgegenwärtig. Sie bilden einen fundamentalen Baustein der Quantenmechanik und sind verantwortlich für die unterschiedlichsten Phänomene von der Biologie bis zur Kosmologie....

Nanostructured In3SbTe2 antennas enable switching from sharp dielectric to broad plasmonic resonances
A. Heßler, S. Wahl, P.T. Kristensen, M. Wuttig, K. Busch, and T. Taubner (2022)
Nanophotonics 11:3871

Phase-change materials (PCMs) allow for non-volatile resonance tuning of nanophotonic components. Upon switching, they offer a large dielectric contrast between their amorphous and crystalline...

Topological protection of partially coherent light
K. Tschernig, G. Martinez-Niconoff, K. Busch, M.A. Bandres, and A. Perez-Leija (2022)
Photonics Research 10:1223

Topological physics exploits concepts from geometry and topology to implement systems capable of guiding waves in an unprecedented fashion. These ideas have led to the development of photonic...

Modulated light potentials for state manipulation of quasiparticles in ultra-cold Bose gases
B. Maaß, D. Hartley, K. Busch, and D. Rätzel (2022)
New Journal of Physics 24:043014

Ensembles of ultra-cold atoms have been proven to be versatile tools for high precision sensing applications. Here, we present a method for the manipulation of the state of trapped clouds of...

Wading through the void: Exploring quantum friction and nonequilibrium fluctuations
D. Reiche, F. Intravaia, and K. Busch (2022)
APL Photonics 7:030902

When two or more objects move relative to one another in vacuum, they experience a drag force, which, at zero temperature, usually goes under the name of quantum friction. This contactless non-...

2021

Tailored Disorder in Photonics: Learning from Nature
M. Rothammer, C. Zollfrank, K. Busch, and G. von Freymann (2021)
Advanced Optical Materials 9:2100787

Disorder and photonics have long been seen as natural adversaries and designers of optical systems have often driven systems to perfection by minimizing deviations from the ideal design....

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