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Author  |
Sekine, Norihiko; Hosako, Iwao |
| Title |
Intensity modulation of terahertz quantum cascade lasers under external light injection |
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Journal Article |
| Year |
2009 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
95 |
Issue |
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Pages |
201106(1-3) |
| Keywords |
QCL modulation, THz, terahertz |
| Abstract |
We investigated the light-current characteristics of terahertz (THz) quantum cascade lasers under external light injection, which excites interband transitions in the active materials. It was found that the amount of reduction in the THz power was constant for all injection currents above threshold, and the dependence of the reduction amount on the wavelength of the external light was observed to show a resonancelike feature. The dominant intensity modulation mechanism was found to be the loss change caused by interband transitions in the active region. Further, the effective coupling efficiency plays an important role in the intensity modulation. |
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Santavicca,D.F.; Reulet,B.; Karasik,B.S.; Pereverzev,S.V.; Olaya, D.; Gershenson, M.E.; Frunzio, L.; Prober, D.E. |
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Energy resolution of terahertz single-photon-sensitive bolometric detectors |
Type |
Journal Article |
| Year |
2010 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
96 |
Issue |
8 |
Pages |
083505 - 083505-3 |
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We report measurements of the energy resolution of ultrasensitive superconducting bolometric detectors. The device is a superconducting titanium nanobridge with niobium contacts. A fast microwave pulse is used to simulate a single higher-frequency photon, where the absorbed energy of the pulse is equal to the photon energy. This technique allows precise calibration of the input coupling and avoids problems with unwanted background photons. Present devices have an intrinsic full-width at half-maximum energy resolution of approximately 23 THz, near the predicted value due to intrinsic thermal fluctuation noise. |
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RPLAB @ akorneev @ |
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601 |
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Rodriguez-Morales, F.; Zannoni, R.; Nicholson, J.; Fischetti, M.; Yngvesson, K. S.; Appenzeller, J. |
| Title |
Direct and heterodyne detection of microwaves in a metallic single wall carbon nanotube |
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Journal Article |
| Year |
2006 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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89 |
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8 |
Pages |
083502 |
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carbon nanotube, GHz heterodyne detector, direct detector |
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0003-6951 |
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565 |
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Mason, Whitney; Waterman, J. R. |
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Electrical and optical characteristics of two color mid wave HgCdTe infrared detectors |
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Journal Article |
| Year |
1999 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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74 |
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11 |
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1633-1635 |
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RPLAB @ s @ |
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461 |
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Marsili, Francesco; Najafi, Faraz; Herder, Charles; Berggren, Karl K. |
| Title |
Electrothermal simulation of superconducting nanowire avalanche photodetectors |
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Journal Article |
| Year |
2011 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
98 |
Issue |
9 |
Pages |
3 |
| Keywords |
SNAP |
| Abstract |
We developed an electrothermal model of NbN superconducting nanowire avalanche photodetectors (SNAPs) on sapphire substrates. SNAPs are single-photon detectors consisting of the parallel connection of N superconducting nanowires. We extrapolated the physical constants of the model from experimental data and we simulated the time evolution of the device resistance, temperature and current by solving two coupled electrical and thermal differential equations describing the nanowires. The predictions of the model were in good quantitative agreement with the experimental results. |
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RPLAB @ gujma @ |
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