79 citations · 138 across the 7 of their papers we have counts for
7 papers
Topological invariants and topological charges in photonic systems
Kristian Arjas, Grazia Salerno, Päivi Törmä
Topology in photonics comes in two distinct flavors: global and local. Global topology considers invariants that are obtained by integrating over the energy band, whereas local top…
T-matrix representation of optical scattering response: Suggestion for a data format
Nigar Asadova, Karim Achouri, Kristian Arjas +39
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 fiel…
High topological charge lasing in quasicrystals
Kristian Arjas, Jani M. Taskinen, Rebecca Heilmann +2
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…
Multi-mode lasing in supercell plasmonic nanoparticle arrays
Rebecca Heilmann, Kristian Arjas, Tommi K. Hakala +1
Multicolour light sources can be used in applications such as lighting and multiplexing signals. In photonic and plasmonic systems, one way to achieve multicolour light is via mult…
Loss-driven topological transitions in lasing
Grazia Salerno, Rebecca Heilmann, Kristian Arjas +3
We experimentally observe lasing in a hexamer plasmonic lattice and find that when tuning the scale of the unit cell, the polarization winding of the emission changes. By a theoret…
Magnetic on-off switching of a plasmonic laser
Francisco Freire-Fernández, Javier Cuerda, Konstantinos S. Daskalakis +5
The nanoscale mode volumes of surface plasmon polaritons have enabled plasmonic lasers and condensates with ultrafast operation. Most plasmonic lasers are based on noble metals, re…
Propagating spin waves in nanometer-thick yttrium iron garnet films: Dependence on wave vector, magnetic field strength and angle
Huajun Qin, Sampo J. Hämäläinen, Kristian Arjas +2
We present a comprehensive investigation of propagating spin waves in nanometer-thick yttrium iron garnet (YIG) films. We use broadband spin-wave spectroscopy with integrated copla…