Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Arijit Bera"'
Autor:
Katja Kohopää, Alberto Ronzani, Robab Najafi Jabdaraghi, Arijit Bera, Mário Ribeiro, Dibyendu Hazra, Jorden Senior, Mika Prunnila, Joonas Govenius, Janne S. Lehtinen, Antti Kemppinen
Publikováno v:
APL Materials, Vol 12, Iss 7, Pp 071101-071101-8 (2024)
We demonstrate ion irradiation by argon or gallium as a wafer-scale post-processing method to increase disorder in superconducting thin films. We study several widely used superconductors, both single-elements and compounds. We show that ion irradiat
Externí odkaz:
https://doaj.org/article/90d8b57d346b4bceba17ebce38fa4dfa
Autor:
Emma Mykkänen, Arijit Bera, Janne S. Lehtinen, Alberto Ronzani, Katja Kohopää, Teresa Hönigl-Decrinis, Rais Shaikhaidarov, Sebastian E. de Graaf, Joonas Govenius, Mika Prunnila
Publikováno v:
Nanomaterials, Vol 10, Iss 5, p 950 (2020)
We have used focused ion beam irradiation to progressively cause defects in annealed molybdenum silicide thin films. Without the treatment, the films are superconducting with critical temperature of about 1 K. We observe that both resistivity and cri
Externí odkaz:
https://doaj.org/article/b3fe9e14051444f39f7fe5eebbd42b82
Publikováno v:
Marin, Y E, Bera, A, Cherchi, M & Aalto, T 2023, ' Ultra-High-Q Racetrack Resonators on Thick SOI Platform through Hydrogen Annealing Smoothing ', Journal of Lightwave Technology, vol. 41, no. 11, pp. 3642-3648 . https://doi.org/10.1109/JLT.2023.3262413
We implemented a hydrogen annealing based post-processing technique as a tool to improve the sidewall roughness of 3 μm thick silicon-on-insulator (SOI) waveguides and demonstrated ultra-high- Q factors on racetrack resonators leveraging on the prop
Publikováno v:
Bera, A, Marin, Y, Harjanne, M, Cherchi, M & Aalto, T 2022, Ultra-low loss waveguide platform in silicon photonics . in G T Reed & A P Knights (eds), Silicon Photonics XVII ., 1200603, International Society for Optics and Photonics SPIE, Proceedings of SPIE-The International Society for Optical Engineering, vol. 12006, Silicon Photonics XVII, San Francisco, California, United States, 20/02/22 . https://doi.org/10.1117/12.2610022
Silicon photonics is the most promising technology for applications ranging from large-bandwidth, low power consumption datacom transceivers, to wearable health monitoring devices, or optical data-bus for quantum processors. To bring silicon PIC base
Autor:
Matteo Cherchi, Arijit Bera, Antti Kemppinen, Jaani Nissilä, Kirsi Tappura, Marco Caputo, Lauri Lehtimäki, Janne Lehtinen, Joonas Govenius, Mika Prunnila, Timo Aalto
Publikováno v:
Integrated Optics: Devices, Materials, and Technologies XXVI
Cherchi, M, Bera, A, Kemppinen, A, Nissilä, J, Tappura, K, Caputo, M, Lehtimäki, L, Lehtinen, J, Govenius, J, Prunnila, M & Aalto, T 2022, Supporting quantum technologies with a micron-scale silicon photonics platform . in S M Garcia-Blanco & P Cheben (eds), Integrated Optics : Devices, Materials, and Technologies XXVI ., 120040A, International Society for Optics and Photonics SPIE, Proceedings of SPIE-The International Society for Optical Engineering, vol. 12004, Integrated Optics: Devices, Materials, and Technologies XXVI, San Francisco, California, United States, 20/02/22 . https://doi.org/10.1117/12.2612182
Cherchi, M, Bera, A, Kemppinen, A, Nissilä, J, Tappura, K, Caputo, M, Lehtimäki, L, Lehtinen, J, Govenius, J, Prunnila, M & Aalto, T 2022, Supporting quantum technologies with a micron-scale silicon photonics platform . in S M Garcia-Blanco & P Cheben (eds), Integrated Optics : Devices, Materials, and Technologies XXVI ., 120040A, International Society for Optics and Photonics SPIE, Proceedings of SPIE-The International Society for Optical Engineering, vol. 12004, Integrated Optics: Devices, Materials, and Technologies XXVI, San Francisco, California, United States, 20/02/22 . https://doi.org/10.1117/12.2612182
VTT micron-scale silicon photonics platform can play a significant role in the second quantum revolution, supporting not only quantum photonics but also solid-state quantum systems. Quantum photonics can benefit from the unique properties of the plat
Autor:
Matteo Cherchi, Arijit Bera, Antti Kemppinen, Jaani Nissilä, Kirsi Tappura, Marco Caputo, Lauri Lehtimäki, Janne Lehtinen, Joonas Govenius, Tomi Hassinen, Mika Prunnila, Timo Aalto
Photonic integrated circuits (PICs) are expected to play a significant role in the ongoing second quantum revolution, thanks to their stability and scalability. Still, major upgrades are needed for available PIC platforms to meet the demanding requir
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4646ac0e09d56fd6295ae6f8b9b15d68
http://arxiv.org/abs/2201.04715
http://arxiv.org/abs/2201.04715
Autor:
Matteo Cherchi, Arijit Bera, Antti Kemppinen, Jaani Nissilä, Kirsi Tappura, Marco Caputo, Lauri Lehtimäki, Janne Lehtinen, Joonas Govenius, Mika Prunnila, Timo Aalto
Publikováno v:
Cherchi, M, Bera, A, Kemppinen, A, Nissilä, J, Tappura, K, Caputo, M, Lehtimäki, L, Lehtinen, J, Govenius, J, Prunnila, M & Aalto, T 2022, An unconventional ultra-low loss silicon photonics platform for quantum technologies . in Quantum 2.0 Conference and Exhibition : QUANTUM 2022 ., QW4A.5, Optical Society of America OSA, Optics InfoBase Conference Papers, Quantum 2.0, QUANTUM 2022, Boston, Massachusetts, United States, 13/06/22 . https://doi.org/10.1364/QUANTUM.2022.QW4A.5
Quantum 2.0 Conference and Exhibition
Quantum 2.0 Conference and Exhibition
Our ultra-low-loss silicon photonics platform can play a significant role in the second quantum revolution, supporting not only quantum photonics (e.g., quantum communication) but also solid-state quantum systems (e.g., scaling superconducting quantu
Publikováno v:
Bera, A, Cherchi, M, Tappura, K, Heimala, P & Aalto, T 2020, Amorphous silicon waveguide escalator : Monolithic integration of active components on 3 μm SOI platform . in G T Reed & A P Knights (eds), Silicon Photonics XV ., 1128507, International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 11285, Silicon Photonics XV 2020, San Francisco, United States, 3/02/20 . https://doi.org/10.1117/12.2544311
VTT's 3 μm SOI platform with record low propagation loss (0.1 dB/cm for fundamental mode), as well as polarization insensitivity, offers a rich portfolio of efficient passive and active components. With a view to extend the component toolbox by mono
Publikováno v:
Optics letters. 43(15)
The growing interest for Fano resonators during the past decade is due to the narrow line shape observable in their optical spectra. The drastic phase shift occurring at the resonance yields a steep drop from a high to low amplitude. Fano resonances
Autor:
Ville Kontturi, Markus Häyrinen, Arijit Bera, Yuri Svirko, Matthieu Roussey, Janne Laukkanen, Ségolène Pélisset, Ismo Vartiainen, Markku Kuittinen, Leila Ahmadi, Seppo Honkanen
Publikováno v:
Integrated Optics: Devices, Materials, and Technologies XXI.
We propose a novel waveguide type based on the concept of strip-loaded waveguide. A strip-loaded waveguide is composed of a thin-film slab waveguide allowing a vertical confinement of the electromagnetic field. A lower refractive index strip provides