Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Imran Akca"'
Publikováno v:
APL Photonics, Vol 8, Iss 5, Pp 056107-056107-10 (2023)
Dielectric optical waveguides constitute the main building blocks of photonic integrated circuits (PICs). Channels with high refractive index contrast can provide very compact PIC components, whereas structures with lower index exhibit less propagati
Externí odkaz:
https://doaj.org/article/f044241315dd44969564da054958a848
Publikováno v:
Sensors, Vol 23, Iss 3, p 1207 (2023)
The detection of methane, a strong greenhouse gas, has increased in importance due to rising emissions, which partly originate from unreported and undetected leaks in oil and gas fields. The gas emitted by these leaks could be detected using an optic
Externí odkaz:
https://doaj.org/article/872876e9174f4ccca2d4525a381cdf8e
Publikováno v:
Sensors, Vol 23, Iss 2, p 924 (2023)
We demonstrate a highly sensitive acoustic vibration sensor based on a tapered-tip optical fiber acting as a microcantilever. The tapered-tip fiber has a unique output profile that exhibits a circular fringe pattern, whose distribution is highly sens
Externí odkaz:
https://doaj.org/article/688706a2ec0745f6b623ef7803094a69
Autor:
Hamed Nikbakht, Mohammad Talebi Khoshmehr, Bob van Someren, Dieter Teichrib, Manfred Hammer, Jens Förstner, B. Imran Akca
Publikováno v:
Nikbakht, H, Khoshmehr, M T, van Someren, B, Teichrib, D, Hammer, M, Förstner, J & Akca, B I 2023, ' Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint ', Optics Letters, vol. 48, no. 2, pp. 207-210 . https://doi.org/10.1364/OL.476537
Optics Letters, 48(2), 207-210. The Optical Society
Optics Letters, 48(2), 207-210. The Optical Society
Here we demonstrate a new, to the best of our knowledge, type of 3-dB coupler that has an ultra-broadband operational range from 1300 to 1600 nm with low fabrication sensitivity. The overall device size is 800 µm including in/out S-bend waveguides.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f29c5bb1672ebb6b9aaf7e5d57365b6c
https://hdl.handle.net/1871.1/0fc3adf2-5d21-43a1-b5c1-503ab1932db2
https://hdl.handle.net/1871.1/0fc3adf2-5d21-43a1-b5c1-503ab1932db2
Publikováno v:
Lu, C, Nikbakht, H, Karabiyik, M, Alaydrus, M & Akca, B I 2021, ' A compound optical microresonator design for self-referencing and multiplexed refractive index sensing ', Optics Express, vol. 29, no. 25, pp. 42215-42224 . https://doi.org/10.1364/OE.443246
Optics Express, 29(25), 42215-42224. The Optical Society
Optics Express, 29(25), 42215-42224. The Optical Society
We propose a new type of self-referencing and multiplexed refractive index (RI) sensor based on a compound optical microresonator structure consisting of Fabry-Pérot (FP) resonators coupled with microring resonators. The transmission spectra shows r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ca094461ab1ed28f84200ca4c3fc5cd
https://research.vu.nl/en/publications/02bc2073-fe71-4855-836c-ea8983ff40e2
https://research.vu.nl/en/publications/02bc2073-fe71-4855-836c-ea8983ff40e2
Autor:
Massimiliano, Berardi, Kajangi, Gnanachandran, Jieke, Jiang, Kevin, Bielawski, Claas W, Visser, Małgorzata, Lekka, B Imran, Akca
Publikováno v:
Soft matter.
The rheological characterization of soft suspended bodies, such as cells, organoids, or synthetic microstructures, is particularly challenging, even with state-of-the-art methods (
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::c7f910a66764f6512a5a78b504e78451
https://pubmed.ncbi.nlm.nih.gov/36445288
https://pubmed.ncbi.nlm.nih.gov/36445288
Publikováno v:
Lu, C, Alaydrus, M, Nikbakht, H & Akca, B I 2022, ' Dynamic control of Fano resonances in a coupled dual microring resonator system ', Journal of Optics (United Kingdom), vol. 24, no. 6, 064009, pp. 1-5 . https://doi.org/10.1088/2040-8986/ac6a63
Journal of Optics (United Kingdom), 24(6):064009, 1-5. IOP Publishing
Journal of Optics (United Kingdom), 24(6):064009, 1-5. IOP Publishing
We propose a coupled optical microresonator system that can be used as a new and flexible platform to form asymmetric Fano-like resonances and dynamically control their line shapes and frequencies. The coupled microresonator system was formed using t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0f4716d47e613099f80d3fafa0b4dbdc
https://hdl.handle.net/1871.1/3c4271bb-438c-4b06-b260-1532478cd23a
https://hdl.handle.net/1871.1/3c4271bb-438c-4b06-b260-1532478cd23a
Publikováno v:
Optics Express, 28(15), 23003-23011. The Optical Society
Nikbakth, H, Karabiyik, M & Akca, B I 2020, ' Ultrawide-bandwidth on-chip spectrometer design using band-pass filters ', Optics Express, vol. 28, no. 15, pp. 23003-23011 . https://doi.org/10.1364/OE.399151
Nikbakth, H, Karabiyik, M & Akca, B I 2020, ' Ultrawide-bandwidth on-chip spectrometer design using band-pass filters ', Optics Express, vol. 28, no. 15, pp. 23003-23011 . https://doi.org/10.1364/OE.399151
Here, we present the design and simulation of an ultrawide-bandwidth on-chip spectrometer that can be used in various applications, e.g. spectral tissue sensing. It covers 1200 nm wavelength range (400 nm-1600 nm) with 2 nm spectral resolution. The o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::56ec1f0d2bfca1d3a5a6d911b9d3c0c7
https://doi.org/10.1364/oe.399151
https://doi.org/10.1364/oe.399151
Publikováno v:
Optics Express, 28(10), 14618-14626. The Optical Society
van Wijk, A, Doerr, C R, Ali, Z, Karabiyik, M & Imran Akca, B 2020, ' Compact ultrabroad-bandwidth cascaded arrayed waveguide gratings ', Optics Express, vol. 28, no. 10, pp. 14618-14626 . https://doi.org/10.1364/OE.394783
van Wijk, A, Doerr, C R, Ali, Z, Karabiyik, M & Imran Akca, B 2020, ' Compact ultrabroad-bandwidth cascaded arrayed waveguide gratings ', Optics Express, vol. 28, no. 10, pp. 14618-14626 . https://doi.org/10.1364/OE.394783
Here, we present a compact, high-resolution, and ultrabroad-bandwidth arrayed waveguide grating (AWG) realized in a silicon nitride (Si3N4) platform. The AWG has a cascaded configuration with a 1×3 flat-passband AWG as the primary filter and three 1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93f89fe8234d5c3f30ac7d75aea6d37d
http://www.scopus.com/inward/record.url?scp=85084409976&partnerID=8YFLogxK
http://www.scopus.com/inward/record.url?scp=85084409976&partnerID=8YFLogxK
Publikováno v:
Optics Letters, 47(23), 6281-6284. The Optical Society
Lu, C, Nikbakht, H, Erdolu, M Y, van Someren, B & Akca, B I 2022, ' Tapered tip optical fibers for measuring ultra-small refractive index changes with record high sensitivity ', Optics Letters, vol. 47, no. 23, pp. 6281-6284 . https://doi.org/10.1364/OL.477288
Lu, C, Nikbakht, H, Erdolu, M Y, van Someren, B & Akca, B I 2022, ' Tapered tip optical fibers for measuring ultra-small refractive index changes with record high sensitivity ', Optics Letters, vol. 47, no. 23, pp. 6281-6284 . https://doi.org/10.1364/OL.477288
Here we demonstrate an inexpensive, simple, and ultra-sensitive refractive index sensor based on a tapered tip optical fiber combined with a straightforward image analysis method. The output profile of this fiber exhibits circular fringe patterns who
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a00040dd0af8124f0798eaf8d090453
https://doi.org/10.1364/ol.477288
https://doi.org/10.1364/ol.477288