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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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Walther, Christoph; Scalari, Giacomo; Faist, Jerome; Beere, Harvey; Ritchie, David |
| Title |
Low frequency terahertz quantum cascade laser operating from 1.6 to 1.8 THz |
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Journal Article |
| Year |
2006 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
89 |
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Pages |
231121(1-3) |
| Keywords |
QCL, 360 uW at 1.6 THz |
| Abstract |
The authors report a GaAs/Al0.1Ga0.9As quantum cascade laser based on a bound-to-continuum transition optimized for low frequency operation. High tunability of the gain curve is achieved by the Stark effect and laser emission is measured between 1.6 and 1.8 THz. Pulsed mode operation up to 95 K and continuous wave operation up to 80 K are reported. The dynamical range in current is as high as 43%. |
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629 |
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Zwiller, V.; Aichele, T.; Seifert, W.; Persson, J.; Benson, O. |
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Generating visible single photons on demand with single InP quantum dots |
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Journal Article |
| Year |
2003 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
82 |
Issue |
10 |
Pages |
1509-1511 |
| Keywords |
single photon, quantum dot, InP |
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0003-6951 |
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503 |
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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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658 |
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Baek, Burm; Lita, Adriana E.; Verma, Varun; Nam, Sae Woo |
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Superconducting a-WxSi1–x nanowire single-photon detector with saturated internal quantum efficiency from visible to 1850 nm |
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Journal Article |
| Year |
2011 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
98 |
Issue |
25 |
Pages |
3 |
| Keywords |
SNSPD |
| Abstract |
We have developed a single-photon detector based on superconducting amorphous tungsten–silicon alloy (a-WxSi1–x) nanowire. Our device made from a uniform a-WxSi1–x nanowire covers a practical detection area (16 μm×16 μm) and shows high sensitivity featuring a plateau of the internal quantum efficiencies, i.e., efficiencies of generating an electrical pulse per absorbed photon, over a broad wavelength and bias range. This material system for superconducting nanowire detector technology could overcome the limitations of the prevalent nanowire devices based on NbN and lead to more practical, ideal single-photon detectors having high efficiency, low noise, and high count rates. |
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