Floquet engineering of the non-Hermitian skin effect in photonic waveguide arrays

S Ke, W Wen, D Zhao, Y Wang - Physical Review A, 2023 - APS
The non-Hermitian skin effect (NHSE), which involves an extensive number of bulk modes
collapsing to open boundaries as skin modes, unveils a variety of unprecedented …

[HTML][HTML] T-matrix representation of optical scattering response: Suggestion for a data format

N Asadova, K Achouri, K Arjas, B Auguié… - Journal of Quantitative …, 2025 - Elsevier
The transition matrix, frequently abbreviated as T-matrix, contains the complete information
in a linear approximation of how a spatially localized object scatters an incident field. The T …

High topological charge lasing in quasicrystals

K Arjas, JM Taskinen, R Heilmann, G Salerno… - Nature …, 2024 - nature.com
Photonic modes exhibiting a polarization winding akin to a vortex possess an integer
topological charge. Lasing with topological charge 1 or 2 can be realized in periodic lattices …

Multimode lasing in supercell plasmonic nanoparticle arrays

R Heilmann, K Arjas, TK Hakala, P Törmä - ACS Photonics, 2023 - ACS Publications
Multicolor light sources can be used in applications such as lighting and multiplexing
signals. In photonic and plasmonic systems, one way to achieve multicolor light is via …

Observation of Quantum metric and non-Hermitian Berry curvature in a plasmonic lattice

J Cuerda, JM Taskinen, N Källman, L Grabitz… - Physical Review …, 2024 - APS
We experimentally observe the quantum geometric tensor, namely, the quantum metric and
the Berry curvature, for a square lattice of radiatively coupled plasmonic nanoparticles. We …

Bound states in the continuum in subwavelength emitter arrays

MB De Paz, PA Huidobro - Physical Review Research, 2023 - APS
Ordered lattices of emitters with subwavelength periodicities support unconventional forms
of light-matter interactions arising from collective effects. Here, we propose the realization …

Enabling infinite Q factors in absorbing optical systems

R Kolkowski, A Shevchenko - Nanophotonics, 2023 - degruyter.com
Resonant optical structures have widespread applications in science and technology.
However, their quality (Q) factors can be significantly deteriorated, if some of their parts …

Super quasibound state in the continuum

Z Zhang, E Bulgakov, K Pichugin, A Sadreev, Y Xu… - Physical Review …, 2023 - APS
Avoided crossing of resonances and merging multiple bound states in the continuum (BICs)
are parallel means for tailoring the physical properties of BICs. Herein, we introduce a …

Pseudospin-orbit coupling and non-Hermitian effects in the quantum geometric tensor of a plasmonic lattice

J Cuerda, JM Taskinen, N Källman, L Grabitz, P Törmä - Physical Review B, 2024 - APS
We theoretically predict the full quantum geometric tensor, comprising the quantum metric
and the Berry curvature, for a square lattice of plasmonic nanoparticles. The gold …

Accessing Beyond-Light Line Dispersion and High-Q Resonances of Dense Plasmon Lattices by Bandfolding

N de Gaay Fortman, D Pal, P Schall… - ACS …, 2025 - ACS Publications
Dense plasmon lattices are promising as experimentally accessible implementations of
seminal tight-binding Hamiltonians, but the plasmonic dispersion of interest lies far beyond …