Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Abebe Tilahun Tarekegne"'
Autor:
Haiyan Ou, Peter Uhd Jepsen, Pernille Klarskov, Korbinian J. Kaltenecker, Krzysztof Iwaszczuk, Kion Norrman, Abebe Tilahun Tarekegne, Weifang Lu
Publikováno v:
Tarekegne, A T, Kaltenecker, K J, Klarskov, P, Iwaszczuk, K, Lu, W, Ou, H, Norrman, K & Jepsen, P U 2020, ' Subcycle Nonlinear Response of Doped 4 H Silicon Carbide Revealed by Two-Dimensional Terahertz Spectroscopy ', ACS Photonics, vol. 7, no. 1, pp. 221-231 . https://doi.org/10.1021/acsphotonics.9b01462
Tarekegne, A T, Kaltenecker, K J, Klarskov, P, Iwaszczuk, K, Lu, W, Ou, H, Norrman, K & Jepsen, P U 2019, ' Subcycle Nonlinear Response of Doped 4H Silicon Carbide Revealed by Two-Dimensional Terahertz Spectroscopy ', ACS Photonics, vol. 7, no. 1, pp. 221-231 . https://doi.org/10.1021/acsphotonics.9b01462
Tarekegne, A T, Kaltenecker, K J, Klarskov, P, Iwaszczuk, K, Lu, W, Ou, H, Norrman, K & Jepsen, P U 2019, ' Subcycle Nonlinear Response of Doped 4H Silicon Carbide Revealed by Two-Dimensional Terahertz Spectroscopy ', ACS Photonics, vol. 7, no. 1, pp. 221-231 . https://doi.org/10.1021/acsphotonics.9b01462
We investigate single-cycle terahertz (THz) field-induced nonlinear absorption in doped silicon carbide. We find that the nonlinear response is ultrafast, and we observe up to 20% reduction of transmission of single THz pulses at peak field strengths
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::47b939b2fc61e21eb1ed07fc16cd195c
https://doi.org/10.1021/acsphotonics.9b01462
https://doi.org/10.1021/acsphotonics.9b01462
Publikováno v:
Scientific Reports, Vol 9, Iss 1, Pp 1-10 (2019)
Scientific Reports
Lu, W, Tarekegne, A T, Ou, Y, Kamiyama, S & Ou, H 2019, ' Temperature-dependent photoluminescence properties of porous fluorescent SiC ', Scientific Reports, vol. 9, no. 1, 16333 . https://doi.org/10.1038/s41598-019-52871-6
Scientific Reports
Lu, W, Tarekegne, A T, Ou, Y, Kamiyama, S & Ou, H 2019, ' Temperature-dependent photoluminescence properties of porous fluorescent SiC ', Scientific Reports, vol. 9, no. 1, 16333 . https://doi.org/10.1038/s41598-019-52871-6
A comprehensive study of surface passivation effect on porous fluorescent silicon carbide (SiC) was carried out to elucidate the luminescence properties by temperature dependent photoluminescence (PL) measurement. The porous structures were prepared
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::159eef7a847e4c44474c7fb719083e9d
http://link.springer.com/article/10.1038/s41598-019-52871-6
http://link.springer.com/article/10.1038/s41598-019-52871-6
Publikováno v:
Journal of Applied Physics; 2018, Vol. 124 Issue 5, p1-13, 13p, 2 Diagrams, 2 Charts, 6 Graphs
Dependence of Photoluminescence Emission on Excitation Power and Temperature in Highly Doped 6H- SiC
Publikováno v:
Physical Review Applied. 13
The excitation power and temperature dependences of photoluminescence (PL) emission in 6H polytype of silicon carbide are investigated extensively. A sublinear power-function dependence of the donor-acceptor pair emission intensity on the excitation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8f96fae7679e15475b339ec6b8b7130a
https://doi.org/10.1103/physrevapplied.13.064002
https://doi.org/10.1103/physrevapplied.13.064002
Supplement document
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1637fb35dbedc31880feea70a3c5c78f
Autor:
Valdas Jokubavicius, Philipp Schuh, Mikael Syväjärvi, Peter J. Wellmann, Kion Norrman, Haiyan Ou, Abebe Tilahun Tarekegne
Publikováno v:
Applied Physics B. 125
High concentrations of aluminum (Al) and nitrogen (N) dopants of 6H SiC have been achieved by a fast sublimation growth process. The Al–N co-doped 6H-SiC layer exhibits a strong light-blue photoluminescence emission at low temperatures due to emiss
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d80085f265354815484ccf2aa9a9b050
https://doi.org/10.1007/s00340-019-7279-8
https://doi.org/10.1007/s00340-019-7279-8
Autor:
Korbinian J. Kaltenecker, Stewart J. Clark, Krzysztof Iwaszczuk, Abebe Tilahun Tarekegne, Binbin Zhou, Peter Uhd Jepsen
Publikováno v:
Optics express, 2019, Vol.27(3), pp.3618-3628 [Peer Reviewed Journal]
Tarekegne, A T, Zhou, B, Kaltenecker, K, Iwaszczuk, K, Clark, S & Jepsen, P U 2019, ' Terahertz time-domain spectroscopy of zone-folded acoustic phonons in 4H and 6H silicon carbide ', Optics Express, vol. 27, no. 3, pp. 3618-3628 . https://doi.org/10.1364/OE.27.003618
Tarekegne, A T, Zhou, B, Kaltenecker, K, Iwaszczuk, K, Clark, S & Jepsen, P U 2019, ' Terahertz time-domain spectroscopy of zone-folded acoustic phonons in 4H and 6H silicon carbide ', Optics Express, vol. 27, no. 3, pp. 3618-3628 . https://doi.org/10.1364/OE.27.003618
We investigate the dielectric properties of the 4H and 6H polytypes of silicon carbide in the 0.1-19 THz range, below the fundamental transverse-optical phonons. Folding of the Brillouin zone due to the specific superlattice structure of the two poly
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::57cad176440f30f51f1829aa793ad480
https://doi.org/10.1364/OE.27.003618
https://doi.org/10.1364/OE.27.003618
Autor:
Abebe Tilahun Tarekegne, Henri Jansen, Jörg Hübner, Bingdong Chang, Ding Zhao, Yuanqing Yang, Chen Zhou, Flemming Jensen
Publikováno v:
Chang, B, Zhou, C, Tarekegne, A T, Yang, Y, Zhao, D, Jensen, F, Hübner, J & Jansen, H 2019, ' Large area three-dimensional photonic crystal membranes : single-run fabrication and applications with embedded planar defects ', Advanced Optical Materials, vol. 7, no. 2, 1801176 . https://doi.org/10.1002/adom.201801176
Chang, B, Zhou, C, Tarekegne, A T, Yang, Y, Zhao, D, Jensen, F, Hübner, J & Jansen, H 2019, ' Large Area Three-Dimensional Photonic Crystal Membranes: Single-Run Fabrication and Applications with Embedded Planar Defects ', Advanced Optical Materials, vol. 7, no. 2, 1801176 . https://doi.org/10.1002/adom.201801176
Chang, B, Zhou, C, Tarekegne, A T, Yang, Y, Zhao, D, Jensen, F, Hübner, J & Jansen, H 2019, ' Large Area Three-Dimensional Photonic Crystal Membranes: Single-Run Fabrication and Applications with Embedded Planar Defects ', Advanced Optical Materials, vol. 7, no. 2, 1801176 . https://doi.org/10.1002/adom.201801176
Three-dimensional photonic crystals (3D PhCs) enable light manipulations in all three spatial dimensions, however, real world applications are still faced with challenges in fabrication. Here, a facile fabrication strategy for 3D silicon PhCs with a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6718856590a5d9e0760c73e4c6e6d16b
https://findresearcher.sdu.dk:8443/ws/files/161204117/AcroBrwEx_2._Manuscript_final_version.pdf_ADWC5E3.tmp.pdf
https://findresearcher.sdu.dk:8443/ws/files/161204117/AcroBrwEx_2._Manuscript_final_version.pdf_ADWC5E3.tmp.pdf
Publikováno v:
Wei, Y, Tarekegne, A T & Ou, H 2019, ' Double D-centers related donor-acceptor-pairs emission in fluorescent silicon carbide ', Optical Materials Express, vol. 9, no. 1, pp. 295-303 . https://doi.org/10.1364/OME.9.000295
A new boron-induced deeper acceptor level (D*-center) different from the D-center in nitrogen-boron co-doped 6H fluorescent silicon carbide (f-SiC) is revealed by measuring the temperature-dependent photoluminescence (PL). The D*-center is correlated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a6603c14210db0f385c988819be777a
https://orbit.dtu.dk/en/publications/82f6a87c-9d2e-41af-8055-a6dcb054dc53
https://orbit.dtu.dk/en/publications/82f6a87c-9d2e-41af-8055-a6dcb054dc53
Publikováno v:
Tarekegne, A T, Janting, J & Ou, H 2020, ' Strong visible-light emission in annealed poly(acrylic acid) ', Optical Materials Express, vol. 10, no. 12, pp. 3424-3434 . https://doi.org/10.1364/OME.411329
An intense and broadband photoluminescence emission is demonstrated in a bio-compatible film produced by thermal annealing of poly(acrylic acid) (PAA). The annealing process enhances the emission intensity from weakly emitting sub-luminophores of C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f2e08656eae3983df20e0c39b4dab969
https://doi.org/10.1364/ome.411329
https://doi.org/10.1364/ome.411329