Zobrazeno 1 - 10
of 296
pro vyhledávání: '"Alfred Y. Cho"'
Autor:
T.H.H. Vuong, J.M. Masson, Robin J. Nicholas, F. Alexandre, M.A. Brummell, K.Y. Cheng, J. C. Portal, Alfred Y. Cho, Manijeh Razeghi
The diagonal component of the thermoelectric power in GaInAsInP, GaInAsAlInAs and GaAsGaAlAs heterojunctions and a GaAsGaAlAs superlattice has been studied as a function of magnetic field and temperature. In high magnetic fields, the ther
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3b926544752d39531c2e321fd625e202
https://ora.ox.ac.uk/objects/uuid:a488eea4-b436-439a-b025-bbc58c353b5c
https://ora.ox.ac.uk/objects/uuid:a488eea4-b436-439a-b025-bbc58c353b5c
Autor:
M.A. Brummell, K.Y. Cheng, M.A. Di Forte-Poisson, Manijeh Razeghi, J. C. Portal, Alfred Y. Cho, Serge Huant, L.C. Brunel, M. Baj, Robin J. Nicholas
Cyclotron resonance results from GaInAs-InP heterojunctions and superlattices and GaInAs-AlInAs heterojunctions in fields up to 18 T are reported. For low frequencies, the effective mass is compared with the predictions of k · p theory, and the reso
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a3e719ee13f2d6909a4368b1c7838d7
https://doi.org/10.1016/0039-6028(84)90338-8
https://doi.org/10.1016/0039-6028(84)90338-8
Autor:
Cheng Hsuan Chen, Deborah L. Sivco, Mariano Troccoli, Claire F. Gmachl, Jianxin Chen, Alfred Y. Cho, Federico Capasso, Milton L. Peabody
Publikováno v:
Journal of Applied Physics. 94:7101-7104
We report on the midinfrared emission from electroluminescent devices with quantum cascade active regions based on InGaAs/InP heterostructures. We observe emission at λ∼12 μm from two different structures and compare their emission characteristic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5cf8fb6db6769e968da93366b108127b
https://doi.org/10.1063/1.1625090
https://doi.org/10.1063/1.1625090
Autor:
Claire F. Gmachl, Oskar Painter, Raffaele Colombelli, Kartik Srinivasan, Deborah L. Sivco, Federico Capasso, Alfred Y. Cho, Donald M. Tennant, Mariano Troccoli, A. Michael Sergent
Publikováno v:
Science. 302:1374-1377
We combine photonic and electronic band structure engineering to create a surface-emitting quantum cascade microcavity laser. A high-index contrast two-dimensional photonic crystal is used to form a micro-resonator that simultaneously provides feedba
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::461849f464f38d1b38d2aadebfbfe4f1
https://doi.org/10.1126/science.1090561
https://doi.org/10.1126/science.1090561
Publikováno v:
Reports on Progress in Physics. 64:1533-1601
Quantum cascade (`QC') lasers are reviewed. These are semiconductor injection lasers based on intersubband transitions in a multiple-quantum-well (QW) heterostructure, designed by means of band-structure engineering and grown by molecular beam epitax
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::af5e37feba289b031497e426f59b0584
https://doi.org/10.1088/0034-4885/64/11/204
https://doi.org/10.1088/0034-4885/64/11/204
Autor:
Deborah L. Sivco, Claire F. Gmachl, Wolfgang Urban, Heiko Ganser, James N. Baillargeon, Federico Capasso, Alfred Y. Cho, Andreas Jentsch, M. Mürtz, Bertold Frech, Albert L. Hutchinson
Publikováno v:
Optics Communications. 197:127-130
We report line width measurements of a quantum cascade distributed feedback laser by a heterodyne experiment. At currents slightly above threshold and a laser output power higher than 1 mW, the full width at half maximum of the beat signal was narrow
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c43a19b0c3aa42a603f369933471e121
https://doi.org/10.1016/s0030-4018(01)01441-9
https://doi.org/10.1016/s0030-4018(01)01441-9
Autor:
Sung Nee G. Chu, Alessandro Tredicucci, Deborah L. Sivco, Michael Clement Wanke, Claire F. Gmachl, Albert L. Hutchinson, Alfred Y. Cho, Federico Capasso
Publikováno v:
Optical Materials. 17:211-217
There is presently a lack of efficient, compact, solid-state sources for the spectral range 1-10 THz, also known as the "terahertz gap". In fact Gunn diodes fail at such high frequencies, while, from the other side, conventional semiconductor lasers
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85672276eee3d1719d5daac1b43e1b68
https://doi.org/10.1016/s0925-3467(01)00046-5
https://doi.org/10.1016/s0925-3467(01)00046-5
Publikováno v:
Journal of Electronic Materials. 30:134-137
Spontaneous and piezoelectric polarization in hexagonal GaN/AlGaN heterostructures give rise to large built-in electric fields. The effect of the builtin electric field in GaN/AlxGa1−xN quantum wells was investigated for x=0.2 to 0.8 by photolumine
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6bbabc89175790ca90dab7093d36399
https://doi.org/10.1007/s11664-001-0006-2
https://doi.org/10.1007/s11664-001-0006-2
Publikováno v:
International Journal of High Speed Electronics and Systems. 10:281-297
A novel velocity-matched distributed balanced photodetector operating at 1.3 and 1.55 μm wavelengths has been proposed and experimentally demonstrated. Distributed absorption and velocity matching of the optical and microwave signals are employed to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9841be5efc73ca49903a9b1e554e593d
https://doi.org/10.1142/s0129156400000313
https://doi.org/10.1142/s0129156400000313
Autor:
Federico Capasso, Claire Gmachl, Alfred Y. Cho, Gaetano Scamarcio, Albert Lee Hutchinson, Deborah Lee Sivco, Alessandro Tredicucci
Publikováno v:
Semiconductor Science and Technology. 13:1333-1339
Long-wavelength infrared interminiband quantum cascade lasers operating at are reported. The structures consist of twenty-five superlattice active regions alternated with electron injectors, all implemented with AlInGas/GaInAs grown lattice matched t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::12c18a6e42439a119b5144278cb18b09
https://doi.org/10.1088/0268-1242/13/11/019
https://doi.org/10.1088/0268-1242/13/11/019