27 citations · 64 across the 9 of their papers we have counts for
9 papers
Noise-like pulse laser source with ultrabroadband tunability and coherence-limited sub-structure
Xinyang Liu, Matias Koivurova, Regina Gumenyuk
High brightness and low coherence laser sources with wideband tunability are essential for many full-field imaging applications aiming for high contrast and speckle free performanc…
High-power monolithic narrow-linewidth 1.6 mJ/8 ns fiber laser system based on all-glass spun tapered double-clad fiber amplifier
Hossein Fathi, Uttam Samanta, Evgenii Motorin +5
High-energy, narrow-linewidth nanosecond pulses are highly demanding for many applications that require high temporal and spatial coherence. However, the amplification of narrow-li…
Cross-spectral purity: a generalization of spatiotemporal separability
Matias Koivurova, Rajneesh Joshi
We study the connection between cross-spectral purity and spatiotemporal separability of nonstationary (pulsed) scalar fields. It is found that in the case of complete coherence, t…
Time-varying media, relativity, and the arrow of time
Matias Koivurova, Charles W. Robson, Marco Ornigotti
We study the implications of time-varying wave mechanics, and show how the standard wave equation is modified if the speed of a wave is not constant in time. In particular, waves w…
Scattering Dominated Spatial Coherence and Phase Correlation Properties in Plasmonic Lattice Lasers
Janne I. Heikkinen, Benjamin Asamoah, Roman Calpe +3
We present a comprehensive study of the polarization and spatial coherence properties of the lasing modes supported by a 4-fold symmetric plasmonic lattice. By modifying only, the…
Epsilon-near-zero nanoparticles
Ibrahim Issah, Jesse Pietila, Tommi Kujala +3
In this work, we propose epsilon-near-zero (ENZ) nanoparticles formed of metal and dielectric bilayers and employ the effective medium approach for multilayered nanospheres to stud…
Finite size mediated radiative coupling of lasing plasmonic bound state in continuum
Benjamin O. Asamoah, Marek Nečada, Wenzhe Liu +12
Radiative properties of lasing plasmonic bound state in continuum are analyzed. The topological charge of the lasing signal is analyzed in the far field as well as in the source pl…
Turbulence-resistant self-focusing vortex beams
Meilan Luo, Matias Koivurova, Marco Ornigotti +1
We consider recently introduced self-focusing fields that carry orbital angular momentum (OAM) [Opt. Lett. , 23842387 (2021)] and in particular, their propagation p…
Metamaterials designed for enhanced ENZ properties]{Metamaterials designed for enhanced ENZ properties
Matias Koivurova, Tommi Hakala, Jari Turunen +3
We examine layered metamaterial structures consisting of alternating films of epsilon-near-zero (ENZ) and dielectric material, and show that for such a stack it is possible to enha…