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Cao, Q.; Yoon, S. F.; Tong, C. Z.; Ngo, C. Y.; Liu, C. Y.; Wang, R.; Zhao, H. X. |
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Two-state competition in 1.3 μm multilayer InAs/InGaAs quantum dot lasers |
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2009 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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95 |
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19 |
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3 |
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2DEG |
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The competition of ground state (GS) and excited state (ES) is investigated from the as-grown and thermally annealed 1.3 μm ten-layer p-doped InAs/GaAs quantum dot (QD) lasers. The modal gain competition between GS and ES are measured and analyzed around the ES threshold characteristics. Our results show that two-state competition is more significant in devices with short cavity length operating at high temperature. By comparing the as-grown and annealed devices, we demonstrate enhanced GS and suppressed ES lasing from the QD laser annealed at 600 °C for 15 s. |
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RPLAB @ gujma @ |
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673 |
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Gaggero, A.; Nejad, S. Jahanmiri; Marsili, F.; Mattioli, F.; Leoni, R.; Bitauld, D.; Sahin, D.; Hamhuis, G. J.; Nötzel, R.; Sanjines, R.; Fiore, A. |
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Title |
Nanowire superconducting single-photon detectors on GaAs for integrated quantum photonic applications |
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Journal Article |
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2010 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
97 |
Issue |
15 |
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3 |
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SSPD |
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We demonstrate efficient nanowire superconducting single photon detectors (SSPDs) based on NbN thin films grown on GaAs. NbN films ranging from 3 to 5 nm in thickness have been deposited by dc magnetron sputtering on GaAs substrates at 350 °C. These films show superconducting properties comparable to similar films grown on sapphire and MgO. In order to demonstrate the potential for monolithic integration, SSPDs were fabricated and measured on GaAs/AlAs Bragg mirrors, showing a clear cavity enhancement, with a peak quantum efficiency of 18.3% at λ = 1300 nm and T = 4.2 K. |
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RPLAB @ gujma @ |
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681 |
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Mannino, Giovanni; Spinella, Corrado; Ruggeri, Rosa; La Magna, Antonino; Fisicaro, Giuseppe; Fazio, Enza; Neri, Fortunato; Privitera, Vittorio |
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Crystallization of implanted amorphous silicon during millisecond annealing by infrared laser irradiation |
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Journal Article |
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2010 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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97 |
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2 |
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3 |
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Annealing |
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We investigated the homogenous nucleation of crystalline grains in amorphous Si during transient temperature pulse of few milliseconds IR laser irradiation. The crystallized volume fraction is ~80%. Significant crystallization occurs in nonsteady regime because of the rapid temperature variation (106 °C/s). Our model combines the time evolution of the crystal grain population with the consumption of the amorphous volume due to the growth of grains. Thanks to the experimental approach based on a laser source to heat α-Si and the theoretical model we extended the description of the spontaneous crystallization up to 1323 K or 250 K above the temperature investigated by conventional annealing. |
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Annealing |
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RPLAB @ gujma @ |
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691 |
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Yates, S. J. C.; Baryshev, A. M.; Baselmans, J. J. A.; Klein, B.; Güsten, R. |
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Fast Fourier transform spectrometer readout for large arrays of microwave kinetic inductance detectors |
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2009 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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95 |
Issue |
4 |
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3 |
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Microwave kinetic inductance detectors have great potential for large, very sensitive detector arrays for use in, for example, submillimeter imaging. Being intrinsically readout in the frequency domain, they are particularly suited for frequency domain multiplexing allowing ~1000 s of devices to be readout with one pair of coaxial cables. However, this moves the complexity of the detector from the cryogenics to the warm electronics. We present here the concept and experimental demonstration of the use of fast Fourier transform spectrometer readout, showing no deterioration of the noise performance compared to the low noise analog mixing while allowing high multiplexing ratios. |
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RPLAB @ gujma @ |
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697 |
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Fetterman, H. R.; Tannenwald, P. E.; Clifton, B. J.; Parker, C. D.; Fitzgerald, W. D.; Erickson, N. R. |
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Far-ir heterodyne radiometric measurements with quasioptical Schottky diode mixers |
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1978 |
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Appl. Phys. Lett. |
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Appl. Phys. Lett. |
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33 |
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2 |
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151-154 |
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Schottky |
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Frequency countings close to a phase locked zone in an electronic receiver show a 1/f power spectral density. The noise scaling versus the frequency deviation and the open loop gain are found from Adler's model of the phase locked loop. This fully agrees with experiments performed at 5 MHz on a receiver with a Schottky diode mixer and a low pass filter. The 1/f amplitude and frequency noise due to the whole set of (sub)harmonics is explained from a nonlinear mapping, with a coupling coefficient related to the structure of prime numbers. |
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