Search Results - "Hakala, Tommi"

Nonlinear nonlocal metasurfaces by Kolkowski, Radoslaw, Hakala, Tommi K., Shevchenko, Andriy, Huttunen, Mikko J.

“…Optical metasurfaces have recently emerged as the game changer in light manipulation and opened up new perspectives in many subfields of optics and photonics…”
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Dual perfect vectorial vortex beam generation with a single spin-multiplexed metasurface by Yang, Jiaqi, Hakala, Tommi K, Friberg, Ari T

“…Perfect optical vortex beams (POVBs) carrying orbital angular momentum (OAM) possess annular intensity profiles that are independent of the topological charge…”
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Bose–Einstein condensation in a plasmonic lattice by Hakala, Tommi K., Moilanen, Antti J., Väkeväinen, Aaro I., Guo, Rui, Martikainen, Jani-Petri, Daskalakis, Konstantinos S., Rekola, Heikki T., Julku, Aleksi, Törmä, Päivi

“…Bose–Einstein condensation is a remarkable manifestation of quantum statistics and macroscopic quantum coherence. Superconductivity and superfluidity have…”
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Controlling Topology and Polarization State of Lasing Photonic Bound States in Continuum by Mohamed, Sughra, Wang, Jie, Rekola, Heikki, Heikkinen, Janne, Asamoah, Benjamin, Shi, Lei, Hakala, Tommi K.

“…Recently, optical bound states in continuum (BICs) incorporated with optical gain have been reported to exhibit lasing. Here, it is shown that each of the four…”
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Multiply-resonant second-harmonic generation using surface lattice resonances in aluminum metasurfaces by Stolt, Timo, Vesala, Anna, Rekola, Heikki, Karvinen, Petri, Hakala, Tommi K, Huttunen, Mikko J

“…Nonlinear metamaterials show potential for realizing flat nonlinear optical devices but are generally lacking in terms of achievable conversion efficiencies…”
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Sub-picosecond thermalization dynamics in condensation of strongly coupled lattice plasmons by Väkeväinen, Aaro I., Moilanen, Antti J., Nečada, Marek, Hakala, Tommi K., Daskalakis, Konstantinos S., Törmä, Päivi

“…Bosonic condensates offer exciting prospects for studies of non-equilibrium quantum dynamics. Understanding the dynamics is particularly challenging in the…”
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Controlled photocatalytic activity of TiO2 inverse opal structures with atomic layer deposited (ALD) metal oxide thin films by Pham, Khai, Pelisset, Segolene, Kinnunen, Niko, Karvinen, Petri, Hakala, Tommi K., Saarinen, Jarkko J.

“…Atomic layer deposited (ALD) thin films of Al2O3, SiO2, and TiO2 with thicknesses ranging from 0.25 nm to 10 nm were studied on TiO2 inverse opal (IO)…”
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Coherence Switching with Metamaterials by Koivurova, Matias, Hakala, Tommi K., Turunen, Jari, Friberg, Ari T., Caglayan, Humeyra, Ornigotti, Marco

“…We demonstrate, theoretically, how the insertion of an enhanced epsilon-near-zero (EENZ) mirror in a laser cavity grants exceptional control over the coherence…”
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Thermal Control of Plasmonic Surface Lattice Resonances by Kelavuori, Jussi, Vanyukov, Viatcheslav, Stolt, Timo, Karvinen, Petri, Rekola, Heikki, Hakala, Tommi K., Huttunen, Mikko J.

“…Plasmonic metasurfaces exhibiting collective responses known as surface lattice resonances (SLRs) show potential for realizing flat photonic components for…”
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Raman enhancement in bowtie-shaped aperture-particle hybrid nanostructures fabricated with DNA-assisted lithography by Kabusure, Kabusure M, Piskunen, Petteri, Yang, Jiaqi, Linko, Veikko, Hakala, Tommi K

“…We report on efficient surface-enhanced Raman spectroscopy (SERS) supporting substrates, which are based on deoxyribonucleic acid (DNA)-assisted lithography…”
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Quasi-BIC Mode Lasing in a Quadrumer Plasmonic Lattice by Heilmann, Rebecca, Salerno, Grazia, Cuerda, Javier, Hakala, Tommi K, Törmä, Päivi

“…Plasmonic lattices of metal nanoparticles have emerged as an effective platform for strong light–matter coupling, lasing, and Bose–Einstein condensation…”
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Scattering dominated spatial coherence and phase correlation properties in plasmonic lattice lasers by Heikkinen, Janne I, Asamoah, Benjamin, Calpe, Roman, Nečada, 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 four-fold symmetric plasmonic lattice…”
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Lasing in Ni Nanodisk Arrays by Pourjamal, Sara, Hakala, Tommi K, Nečada, Marek, Freire-Fernández, Francisco, Kataja, Mikko, Rekola, Heikki, Martikainen, Jani-Petri, Törmä, Päivi, van Dijken, Sebastiaan

“…We report on lasing at visible wavelengths in arrays of ferromagnetic Ni nanodisks overlaid with an organic gain medium. We demonstrate that by placing an…”
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Ultrafast Pulse Generation in an Organic Nanoparticle-Array Laser by Daskalakis, Konstantinos S, Väkeväinen, Aaro I, Martikainen, Jani-Petri, Hakala, Tommi K, Törmä, Päivi

“…Nanoscale coherent light sources offer potentially ultrafast modulation speeds, which could be utilized for novel sensors and optical switches. Plasmonic…”
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Optical Plasmon Excitation in Transparent Conducting SrNbO3 and SrVO3 Thin Films by Mirjolet, Mathieu, Kataja, Mikko, Hakala, Tommi K., Komissinskiy, Philipp, Alff, Lambert, Herranz, Gervasi, Fontcuberta, Josep

“…Transparent and metallic oxides based on 3d and 4d metals are promising materials for plasmonics. Here, the growth window to obtain epitaxial SrNbO3 (4d1) thin…”
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Observation of enhanced epsilon-near-zero effects in resonant stratified media by Calpe, Roman, Karvinen, Petri, Pääkkönen, Pertti, Ornigotti, Marco, Caglayan, Humeyra, Turunen, Jari, Hakala, Tommi K., Koivurova, Matias

“…Epsilon-near-zero (ENZ) materials have gained recent interest due to their exotic optical properties, but their potential is limited by intrinsic material…”
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Optically induced crossover from weak to strong coupling regime between surface plasmon polaritons and photochromic molecules by Asamoah, Benjamin O., Mohamed, Sughra, Datta, Srijoyee, Karvinen, Petri, Rekola, Heikki, Priimagi, Arri, Hakala, Tommi K.

“…We demonstrate optically induced crossover from a weak to a strong coupling regime in a single photonic system consisting of propagating surface plasmon…”
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Metamaterials designed for enhanced ENZ properties by 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…”
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Plasmon-induced demagnetization and magnetic switching in nickel nanoparticle arrays by Kataja, Mikko, Freire-Fernández, Francisco, Witteveen, Jorn P., Hakala, Tommi K., Törmä, Päivi, van Dijken, Sebastiaan

“…We report on the manipulation of magnetization by femtosecond laser pulses in a periodic array of cylindrical nickel nanoparticles. By performing experiments…”
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Polarization dependent beaming properties of a plasmonic lattice laser by Asamoah, Benjamin O, Partanen, Henri, Mohamed, Sughra, Heikkinen, Janne, Halder, Atri, Koivurova, Matias, Nečada, Marek, Setälä, Tero, Turunen, Jari, Friberg, Ari T, Hakala, Tommi K

“…We study beaming properties of laser light produced by a plasmonic lattice overlaid with organic fluorescent molecules. The crossover from spontaneous emission…”
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