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Ciulin, V.; Carter, S. G.; Sherwin, M. S. |
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Title |
Terahertz optical mixing in biased GaAs single quantum wells |
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Journal Article |
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Year |
2004 |
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Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
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Volume |
70 |
Issue |
11 |
Pages |
115312-(1-6) |
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Keywords |
optical mixing |
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1098-0121 |
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501 |
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Author |
Colombelli, R |
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Title |
FIR quantum cascade lasers at λ>20 μm and THz emitters at λ=80 μm |
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Journal Article |
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Year |
2002 |
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Phys. E: Low-dimensional Systems and Nanostructures |
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Volume |
13 |
Issue |
2-4 |
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848-853 |
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1386-9477 |
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483 |
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Author |
Cooper, L. N. |
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Title |
Bound electron pairs in a degenerate fermi gas |
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Journal Article |
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Year |
1956 |
Publication |
Phys. Rev. |
Abbreviated Journal |
Phys. Rev. |
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Volume |
104 |
Issue |
4 |
Pages |
1189-1190 |
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BCS |
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899 |
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Author |
Czerny, Carl; Germer, Heinrich |
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Title |
Selected pianoforte-studies. Edition nr. 300 |
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Book Whole |
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Year |
1900 |
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children, music, piano, learning, school |
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Hansen |
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1845 |
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Danerud, M.; Winkler, D.; Lindgren, M.; Zorin, M.; Trifonov, V.; Karasik, B. S.; Gol’tsman, G. N.; Gershenzon, E. M. |
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Title |
Nonequilibrium and bolometric photoresponse in patterned YBa2Cu3O7−δ thin films |
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Journal Article |
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Year |
1994 |
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J. Appl. Phys. |
Abbreviated Journal |
J. Appl. Phys. |
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Volume |
76 |
Issue |
3 |
Pages |
1902-1909 |
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Keywords |
YBCO HTS HEB detector, nonequilibrium response |
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Abstract |
Epitaxial laser deposited YBa2Cu3O7−δ films of ∼50 nm thickness were patterned into detectors consisting of ten parallel 1 μm wide strips in order to study nonequilibrium and bolometric effects. Typically, the patterned samples had critical temperatures around 86 K, transition widths around 2 K and critical current densities above 1×106A/cm2 at 77 K. Pulsed laser measurements at 0.8 μm wavelength (17 ps full width at half maximum) showed a ∼30 ps response, attributed to electron heating, followed by a slower bolometric decay. Amplitude modulation in the band fmod=100 kHz–10 GHz of a laser with wavelength λ=0.8 μm showed two different thermal relaxations in the photoresponse. Phonon escape from the film (∼3 ns) is the limiting process, followed by heat diffusion in the substrate. Similar relaxations were also seen for λ=10.6 μm. The photoresponse measurements were made with the film in the resistive state and extended into the normal state. These states were created by supercritical bias currents. Measurements between 75 and 95 K (i.e., from below to above Tc) showed that the photoresponse was proportional to dR/dT for fmod=1 MHz and 4 GHz. The fast response is limited by the electron‐phonon scattering time, estimated to 1.8 ps from experimental data. The responsivity both at 0.8 and 10.6 μm wavelength was ∼1.2 V/W at fmod=1 GHz and the noise equivalent power was calculated to 1.5×10−9 WHz−1/2 for the fast response. |
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0021-8979 |
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1637 |
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