2025

Nonlocality in photonic materials and metamaterials: roadmap
F. Monticone, N. A. Mortensen, A. I. Fernández-Domínguez, Y. Luo, X.i Zheng, C. Tserkezis, J. B. Khurgin, T. V. Shahbazyan, A. J. Chaves, N. M. R. Peres, G. Wegner, K. Busch, H. Hu, F. Della Sala, P. Zhang, C. Ciracì, J. Aizpurua, A. Babaze, A. G. Borisov, X.-W. Chen, T. Christensen, W. Yan, Y. Yang, U. Hohenester, L. Huber, M. Wubs, S. De Liberato, P. A. D. Gonçalves, F. J. García de Abajo, Hess, et al. (2025)
Optical Materials Express 15:1544

Photonic technologies continue to drive the quest for new optical materials with unprecedented responses. A major frontier in this field is the exploration of nonlocal (spatially dispersive)...

Relativistic electron energy-loss spectroscopy in cylindrical waveguides and holes
A. Rodriguez Echarri, W. Zhao, K. Busch, and J. Garcia de Abajo (2025)
Physical Review B 111:205436

Swift electrons passing near or through metallic structures have proven to be an excellent tool for studying plasmons and other types of confined optical modes involving collective charge...

2024

Breakdown of temporal-coupled-mode theory under multiple excitations with destructive interference
L. Simonson, Ş. K. Özdemir, K. Busch, and R. El-Ganainy (2024)
Physical Review A 110:033509

Temporal-coupled-mode theory (TCMT) is an important tool that is widely used for analyzing and designing integrated photonic systems that consist of multiple connected resonators. In...

Tailoring the nonclassicality of light states via mode detuning in waveguide beam splitters
A,M, Datta, A. Perez-Leija, and K. Busch (2024)
Journal of the Optical Society of America B 41:1557

The recent advent of integrated waveguide systems with reconfigurable propagation constants and coupling coefficients has opened the door to using waveguide detuning as a resource for readily...

Electron beams traversing spherical nanoparticles: Analytic and numerical treatment
P.E. Stamatopoulou, W. Zhao, Á. Rodríguez Echarri, N.A. Mortensen, K. Busch, C. Tserkezis, and C. Wolff (2024)
Physical Review Research 6:013239

We present an analytic, Mie theory-based solution for the energy loss and the photon-emission probabilities in the interaction of spherical nanoparticles with electrons passing nearby and...

Time-domain modeling of interband transitions in plasmonic systems
M. Pfeiffer, D. Huynh, G. Wegner, F. Intravaia, U. Peschel, and K. Busch (2024)
Applied Physics B 130:7

Efficient modeling of dispersive materials via time-domain simulations of the Maxwell equations relies on the technique of auxiliary differential equations. In this approach, a material’s...

2023

High-accuracy Casimir-Polder force calculations using the Discontinuous Galerkin Time-Domain method
P.T. Kristensen, B. Beverungen, F. Intravaia, and K. Busch (2023)
Physical Review B 108:205424

We describe a numerical time-domain approach for high-accuracy calculations of Casimir-Polder forces near microstructured materials. The use of a time-domain formulation enables the...

The Effect of Nanoparticle Composition on the Surface-Enhanced Raman Scattering Performance of Plasmonic DNA Origami Nanoantennas
Y. Kanehira, K. Tapio, G. Wegner, S. Kogikoski Jr., S. Rüstig, C. Prietzel, K. Busch, and I. Bald (2023)
ACS Nano 17:21227

A versatile generation of plasmonic nanoparticle dimers for surface-enhanced Raman scattering (SERS) is presented by combining a DNA origami nanofork and spherical and nonspherical Au or Ag...

Binary Addressable Optical Multiplexing Waveguides via Electrochromic Switching
S.-Y. Thim, M. Heyl, K. Busch, and E. List-Kratochvil (2023)
physica status solidi (a) 2300177

Photonic circuits attract much attention as promising candidates to overcome the drawbacks of their electronic counterparts. By utilizing the broad bandwidth and low energy consumption of...

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 J. 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...

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