Zobrazeno 1 - 10
of 107
pro vyhledávání: '"Koivurova, Matias"'
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 which experience longitudinal acceleration are shown to have clear rela
Externí odkaz:
http://arxiv.org/abs/2304.08108
Autor:
Heikkinen, Janne I., Asamoah, Benjamin, Calpe, Roman, Necada, Marek, Koivurova, Matias, Hakala, Tommi K.
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 scattering properties of the individual particles while keeping the la
Externí odkaz:
http://arxiv.org/abs/2209.10911
Autor:
Issah, Ibrahim, Pietila, Jesse, Kujala, Tommi, Koivurova, Matias, Caglayan, Humeyra, Ornigotti, Marco
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 study their optical response. We obtained a passive tunable ENZ region by
Externí odkaz:
http://arxiv.org/abs/2208.05299
Autor:
Asamoah, Benjamin O., Nečada, Marek, Liu, Wenzhe, Heikkinen, Janne, Mohamed, Sughra, Halder, Atri, Rekola, Heikki, Koivurova, Matias, Väkeväinen, Aaro I., Törmä, Päivi, Turunen, Jari, Setälä, Tero, Friberg, Ari T., Shi, Lei, Hakala, Tommi K.
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 plane of the finite sized plasmonic lattice. The physical mechanism enab
Externí odkaz:
http://arxiv.org/abs/2206.05011
We consider recently introduced self-focusing fields that carry orbital angular momentum (OAM) [Opt. Lett. $\textbf{46}$, 2384$-$2387 (2021)] and in particular, their propagation properties through a turbulent ocean. We show that this type of field i
Externí odkaz:
http://arxiv.org/abs/2203.01724
Autor:
Koivurova, Matias, Hakala, Tommi, Turunen, Jari, Friberg, Ari T., Ornigotti, Marco, Caglayan, Humeyra
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 enhance the refractive, reflective or absorptive properties of the ENZ. Th
Externí odkaz:
http://arxiv.org/abs/2007.06297
Publikováno v:
EPJ Web of Conferences, Vol 309, p 10030 (2024)
We have developed a fast, high-resolution, and single-shot lensless imaging technique based on the wavefront folding interferometer (WFI). Considering a stationary, quasimonochromatic, and quasihomoge-ncous source of light we studied the effect of sp
Externí odkaz:
https://doaj.org/article/ff223acac47743f5a9ccc8002ed9e3ea
Akademický článek
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Akademický článek
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Publikováno v:
EPJ Web of Conferences, Vol 287, p 05038 (2023)
We present an experimental realization of a novel layered metamaterial we label enhanced epsilon-near-zero (eENZ). The structure is a stack of alternating thin films made of ENZ– and dielectric material and it can be designed for desired refractive
Externí odkaz:
https://doaj.org/article/e3dcf86070404c7295a8bd03c80778df