Zobrazeno 1 - 10
of 169
pro vyhledávání: '"Pentti Karioja"'
Publikováno v:
International Journal of Electronics and Telecommunications, Vol vol. 66, Iss No 2, Pp 361-367 (2020)
VTT Technical Research Centre of Finland Ltd. has developed and utilized Low Temperature Co-fired Ceramic (LTCC) technology for about 25 years. This paper presents our activities related to photonics and millimetre-waves, including also a relevant li
Externí odkaz:
https://doaj.org/article/fbc97ea49b084b639f33899645bddfcc
Autor:
Marianne Hiltunen, Esa Heinonen, Jussi Hiltunen, Jarkko Puustinen, Jyrki Lappalainen, Pentti Karioja
Publikováno v:
IEEE Photonics Journal, Vol 5, Iss 2, Pp 2200808-2200808 (2013)
A nanoimprint mold for optical waveguide applications was fabricated by combining photolithography and focused ion beam (FIB) milling. The feasibility of the proposed method was demonstrated by imprinting 15-mm-long Y-branch waveguides, which had nan
Externí odkaz:
https://doaj.org/article/6f9b2b3c321c4f44a2dafbbf49525e9a
Autor:
Rafal Kasztelanic, Adam Filipkowski, Dariusz Pysz, Hue Thi Nguyen, Ryszard Stepien, Sheng Liang, Johann Troles, Pentti Karioja, Ryszard Buczynski
Publikováno v:
Kasztelanic, R, Filipkowski, A, Pysz, D, Nguyen, H T, Stepien, R, Liang, S, Troles, J, Karioja, P & Buczynski, R 2022, ' Development of gradient index microlenses for the broadband infrared range ', Optics Express, vol. 30, no. 2, pp. 2338-2352 . https://doi.org/10.1364/OE.448461
Optics Express
Optics Express, 2022, 30 (2), pp.2338-2352. ⟨10.1364/OE.448461⟩
Optics Express
Optics Express, 2022, 30 (2), pp.2338-2352. ⟨10.1364/OE.448461⟩
The development of gradient index free-form micro-optic components dedicated to the mid-infrared range is challenging due to the lack of appropriate technology. We propose a method for developing gradient index components for broadband infrared range
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::298d799bd0e18c4caa9aa1d1ecc1dd6d
https://pubmed.ncbi.nlm.nih.gov/35209376
https://pubmed.ncbi.nlm.nih.gov/35209376
Autor:
Hue Thi Nguyen, Ryszard Stepien, Tomasz Stefaniuk, Ryszard Buczynski, Konrad Krzyzak, Pentti Karioja, Rafal Kasztelanic, Jaroslaw Cimek, Dariusz Pysz, Adam Filipkowski
Publikováno v:
Filipkowski, A, Nguyen, H T, Kasztelanic, R, Stefaniuk, T, Cimek, J, Pysz, D, Stepien, R, Krzyzak, K, Karioja, P & Buczynski, R 2019, ' Development of large diameter nanostructured GRIN microlenses enhanced with temperature-controlled diffusion ', Optics Express, vol. 27, no. 24, pp. 35052-35064 . https://doi.org/10.1364/OE.27.035052
Nanostructured GRIN components are optical elements which can have an arbitrary refractive index profile while retaining flat-parallel entry and exit facets. A method of their fabrication requires assembly of large quantities of glass rods in order t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c8bb46e5a4607f43990bc694fb73230
https://pubmed.ncbi.nlm.nih.gov/31878681
https://pubmed.ncbi.nlm.nih.gov/31878681
Autor:
Pentti Karioja
Publikováno v:
Karioja, P 2019, ' IR-Spectroscopic technologies for gas sensing ', Optics & Photonics in Sweden 2019 (OPS), Kista, Sweden, 16/10/19-17/10/19 .
VTT Technical Research Centre of Finland-PURE
VTT Technical Research Centre of Finland-PURE
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::ece2b805a17c16d6a8fee3a95e36d6d4
https://cris.vtt.fi/en/publications/8e9b59b8-6e7e-4237-990e-e7c1a4b55517
https://cris.vtt.fi/en/publications/8e9b59b8-6e7e-4237-990e-e7c1a4b55517
Autor:
Pentti Karioja
Publikováno v:
Karioja, P 2019, ' Accelerating Photonics innovation for companies and researchers-ACTPHAST 4.0 and ACTPHAST 4R ', Optics & Photonics in Sweden 2019 (OPS), Kista, Sweden, 16/10/19-17/10/19 .
VTT Technical Research Centre of Finland-PURE
VTT Technical Research Centre of Finland-PURE
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::4504582572e5a5df464eaf6b389782df
https://cris.vtt.fi/en/publications/51f415c8-8187-49d0-b181-9a2d88ef6e28
https://cris.vtt.fi/en/publications/51f415c8-8187-49d0-b181-9a2d88ef6e28
Autor:
Eero Koivusalo, Jukka Viheriälä, Samu-Pekka Ojanen, Mircea Guina, Matteo Cherchi, Pentti Karioja, Nouman Zia
Publikováno v:
Ojanen, S P, Viheriälä, J, Cherchi, M, Zia, N, Koivusalo, E, Karioja, P & Guina, M 2019, GaSb-based 2.55 µm external cavity diode lasers employing ruled diffraction gratings and external silicon photonics vernier reflectors . in 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) . IEEE Institute of Electrical and Electronic Engineers, Optics InfoBase Conference Papers, European Conference on Lasers and Electro-Optics, CLEO Europe 2019, Munich, Germany, 23/06/19 . https://doi.org/10.1109/CLEOE-EQEC.2019.8873375
Scopus-Elsevier
Scopus-Elsevier
Important environmental gases, such as H 2 S, C 2 H 4 , CH 4 , CO, CO 2 , N 2 O, and H 2 O, have strong absorption lines in the 2–3 μm wavelength range. Tunable external cavity diode lasers (ECDLs) present an attractive option for the spectroscopi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::38806955caf80a3e54449561a695cd7d
https://cris.vtt.fi/en/publications/a08cb53a-0697-46fa-9aa2-8115a01084ea
https://cris.vtt.fi/en/publications/a08cb53a-0697-46fa-9aa2-8115a01084ea
Autor:
Samuli Siitonen, Sanna Aikio, Marianne Hiltunen, Peter A. Lieberzeit, Martin Zeilinger, Johanna Hiitola-Keinänen, Ville Kontturi, Jussi Hiltunen, Pentti Karioja, Leena Hakalahti, Jarkko Puustinen
Publikováno v:
Aikio, S, Zeilinger, M, Hiltunen, J, Hakalahti, L, Hiitola-Keinänen, J, Hiltunen, M, Kontturi, V, Siitonen, S, Puustinen, J, Lieberzeit, P & Karioja, P 2016, ' Disposable (bio)chemical integrated optical waveguide sensors implemented on roll-to-roll produced platforms ', RSC Advances, vol. 6, no. 56, pp. 50414-50422 . https://doi.org/10.1039/c6ra07320d
To enable wide spread dissemination of sensors in cost-critical applications and resource poor settings, methods to implement sensor chips using low-cost materials and mass-manufacturing methods are developed. In this paper we demonstrate that dispos
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5736667cca31a78f29d359980c655da7
https://cris.vtt.fi/en/publications/f6960a38-f1a8-4829-b529-b2da0ba12269
https://cris.vtt.fi/en/publications/f6960a38-f1a8-4829-b529-b2da0ba12269
Autor:
Pentti Karioja, Nouman Zia, Jukka Viheriälä, Mircea Guina, Eero Koivusalo, Samu Pekka Ojanen, Matteo Cherchi
Publikováno v:
Ojanen, S P, Viheriälä, J, Cherchi, M, Zia, N, Koivusalo, E, Karioja, P & Guina, M 2020, ' GaSb diode lasers tunable around 2.6 μm using silicon photonics resonators or external diffractive gratings ', Applied Physics Letters, vol. 116, no. 8, 081105 . https://doi.org/10.1063/1.5140062
We report two tunable diode laser configurations emitting around 2.6 μm, where the gain is provided by a high-gain GaSb-based reflective semiconductor optical amplifier. The lasers are driven in pulsed mode at 20 °C, with a pulse width of 1 μs and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b74348c9d4cd8c7bcbd90e70e6f2ffd
https://doi.org/10.1063/1.5140062
https://doi.org/10.1063/1.5140062
Autor:
Pentti Karioja
Publikováno v:
Karioja, P 2018, ' Components and solutions for gas sensing at Mid-IR ', EPIC Meeting on Environmental Monitoring, Abeldoorn, Netherlands, 15/11/18-16/11/18 .
VTT Technical Research Centre of Finland-PURE
VTT Technical Research Centre of Finland-PURE
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::c2403abc66d47e5d606d3e26cc1c8870
https://cris.vtt.fi/en/publications/05f604a5-5713-4ae9-a7bd-cbfa299f1f65
https://cris.vtt.fi/en/publications/05f604a5-5713-4ae9-a7bd-cbfa299f1f65