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THz surface emitting distributed feedback QCL operated at 70 K as local oscillator

THz surface emitting distributed feedback QCL operated at 70...

引用

21st International Symposium on Space Terahertz technology 2010, ISSTT 2010

作者： Ren, Y. Visser, P.J. De Hovenier, J.N. Zhang, W. Khosropanah, P. Gao, J.R. Klapwijk, T.M. Shi, S.C. Kao, T.Y. Kumar, S. Hu, Q. Reno, J.L. Kavli Institute of NanoScience Delft University of Technology Netherlands Chinese Academy of Sciences Nanjing China Graduate School Chinese Academy of Sciences China SRON Netherlands Institute for Space Research Netherlands Department of Electrical Engineering Computer Science Massachusetts Institute of Technology Cambridge United States Sandia National Laboratories Albuquerque NM 87185-0601 United States

ISBN: (纸本)9781617823626

We report a set of measurements to demonstrate a new type of surface emitting distributed feedback (DFB) quantum cascade laser (QCL) operated at 3.5 THz as local oscillator by pumping a superconducting hot-electron bolometer (HEB) mixer. The second order DFB surface emitting THz QCL, based on the Bragg gratings incorporated into the waveguide, shows single mode emission at 3.555 THz, which is only 4 GHz off from the hydroxyl (OH) line. This frequency can be slightly tuned by operating current or temperature. Because of the radiation being emitted from the surface, the far-field beam is much improved, with a divergent far field beam pattern only in one direction. We also notice that in the far field beam pattern, unlike conventional metal-metal waveguide QCLs, there are no interference patterns. All these make it possible to fully pump a superconducting NbN HEB mixer with a surface emitting DFB QCL at 60 K, and even at 70 K based on the estimated power.

关键词： Quantum cascade lasers

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Time-domain observation of Rabi flopping in a laser

Time-domain observation of Rabi flopping in a laser

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作者： Choi, Hyunyong Gkortsas, Vasileios-Marios Diehl, Laurent Bour, David Corzine, Scott Zhu, Jintian Höfler, Gloria Capasso, Federico Kärtner, Franz X. Norris, Theodore B. Center for Ultrafast Optical Science Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109-2099 United States Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 United States Agilent Laboratories 3500 Deer Creek Road Palo Alto CA 94304 United States Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 United States

ISBN: (纸本)9781557528902

关键词： Quantum cascade lasers

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The quasi-sliding mode control for a class of discrete-time bilinear systems

The quasi-sliding mode control for a class of discrete-time ...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Ti-Hung Chen Jui-Yiao Su Chung-Chun Kung Shin-Huang Li Department of Computer Information and Network Engineering Lunghwa University of Science and Technology Taoyuan Taiwan Mechanical and Systems Research Laboratories Industrial Technology and Research Institute Hsinchu Taiwan Department of Electrical Engineering Tatung University Taipei Taiwan

In this paper, we propose the two quasi-sliding mode control for bilinear systems. By proper choice of the parameters in the control law, the system states will move within the quasi-sliding mode control band. Finally... 详细信息

关键词： Radio access networks Helium

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A unified drain current model for nanoscale double-gate and surrounding-gate MOSFETs incorporating velocity saturation

A unified drain current model for nanoscale double-gate and ...

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IEEE International Nanoelectronics Conference (INEC)

作者： Lining Zhang Xingye Zhou Yiwen Xu Lin Chen Wang Zhou Yingxue Li Frank He Mansun Chan Key Laboratory of Integrated Microsystems Peking University Shenzhen China TSRC School of Electronic Engineering and Computer Science Peking University Beijing China Department of Electrical and Electronic Engineering Hong Kong University of Science and Technology Hong Kong China

A unified drain current model for undoped or lightly doped double-gate (DG) and surrounding-gate (SRG) MOSFETs incorporating velocity saturation effect are presented in this paper. The unified charge-based core model for undoped or lightly doped DG and SRG MOSFETs is presented first. Caughey-Thomas engineering mobility model with exponent factor n=2 is then integrated self-consistently into the unified drain current model derivation of the two device structure. Extensive two dimensional (2D) and three dimensional (3D) device simulations are performed to validate the proposed model. Symmetry property of the proposed unified current model is obtained with the exponent factor n=2 in Cauhey-Thomas Model.

关键词： MOSFETs Electron devices Solid modeling Geometry Semiconductor device modeling Nanoscale devices Integrated circuit modeling Testing Helium Electrostatics

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A park transform-based method for condition monitoring of three-phase electromechanical systems

A park transform-based method for condition monitoring of th...

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5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010)

作者： Christopher Laughman Steven B. Leeb Leslie K. Norford Steven R. Shaw Peter R. Armstrong Mitsubishi Electric Research Laboratories Inc. Cambridge MA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Department of Architecture Massachusetts Institute of Technology Cambridge MA USA Department of Electrical and Computer Engineering Montana State University Bozemon MT USA Masdar Institute of Science and Technology Abu Dhabi United Arab Emirates

This paper presents a Park transform-based method for preprocessing stator current data from a motor and transforming it into a form that is useful for fault detection and diagnostics. The proposed method generates power signatures that are invariant to the initial electrical angle of the voltage when the motor is connected to the utility, and can also adapt to variations in the electrical angle of the supply voltage over time. A modified nonlinear least squares algorithm identifies and tracks the parameters of the supply voltage over time, ensuring that the supply voltage and the argument of the Park transformation remain synchronized. Experimental results are presented that illustrate the method's effectiveness for identifying changes in the mechanical load on a 3/4 HP refrigeration compressor.

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Correlation between gated-diode R-G current and performance degradation of SOI n-MOSFETs after F-N stress test

Correlation between gated-diode R-G current and performance ...

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作者： Bian, Wei Yan, Zhifeng He, Jin Ma, Chenyue Zhang, Chenfei Chan, Mansun Key Laboratory of Integrated Microsystems School of Computer and Information Engineering Peking University Shenzhen Graduate School Shenzhen 518055 China TSRC Institute of Microelectronics School of Electronic Engineering and Computer Science Beijing 100871 China Peking University Shenzhen SOC Key Laboratory PKU HKUST Shenzhen Institute W303 West Tower IER Bldg. Hi-Tech Industrial Park South Shenzhen 518057 China Department of Electrical and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Koloon Hong Kong

ISBN: (纸本)9781439834022

A correlation between the gated-diode R-G current and the performance degradation of SOI n-channel MOS transistor after F-N stress test has been demonstrated in this paper. Due to increase of interface traps after F-N stress test, the generation-recombination (R-G) current of the gated-diode in the SOI-MOSFET architecture increases while the performance characteristics of MOSFET transistor such as the saturation drain current and sub-threshold slope generate degradation. From a series of experimental measurements of the gated-diode and the SOI-MOSFET DC characteristics, a linear decrease of the drain saturation current and increase of the threshold voltage as well as the like-line rise of the sub-threshold swing and the corresponding degradation of the trans-conductance are also observed. These results provide theoretical and experimental evidences for us to use the gated-diode tool to monitor SOI-MOSFET degradation.

关键词： MOSFET devices

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Time-domain observation of Rabi flopping in a laser

Time-domain observation of Rabi flopping in a laser

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Conference on Lasers and Electro-Optics (CLEO)

作者： Hyunyong Choi Vasileios-Marios Gkortsas Laurent Diehl David Bour Scott Corzine Jintian Zhu Gloria Höfler Federico Capasso Franz X. Kärtner Theodore B. Norris Center for Ultrafast Optical Science Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA School of Engineering and Applied Sciences Harvard University Cambridge MA USA Agilent Laboratories Palo Alto CA USA

We report direct time-domain observation of Rabi flopping in an operating semiconductor quantum cascade laser.

ISBN: (纸本)9781557528896

We report direct time-domain observation of Rabi flopping in an operating semiconductor quantum cascade laser.

关键词： Time domain analysis Quantum cascade lasers Optical pulses Ultrafast optics laboratories Lead compounds Temperature Resonance Wavelength measurement Pulse measurements

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Development of tunable terahertz wire lasers

Development of tunable terahertz wire lasers

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Conference on Lasers and Electro-Optics (CLEO)

作者： Qi Qin Benjamin S. Williams Sushil Kumar Qing Hu John L Reno Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Department of Electrical Engineering University of California Los Angeles CA USA Center of Integrated Nanotechnologies Sandia National Laboratories Albuquerque NM USA

We report a novel tuning mechanism based on a “wire-laser” with subwavelength transverse dimensions(w

ISBN: (纸本)9781557528896

We report a novel tuning mechanism based on a “wire-laser” with subwavelength transverse dimensions(w

关键词： Tunable circuits and devices Wire Laser tuning Laser modes Frequency Quantum cascade lasers Waveguide lasers Gratings Laser feedback Distributed feedback devices

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Gas cell measurement using a 2.9 THz heterodyne receiver based on a quantum cascade laser and a superconducting hot electron bolometer

Gas cell measurement using a 2.9 THz heterodyne receiver bas...

引用

21st International Symposium on Space Terahertz technology 2010, ISSTT 2010

作者： Ren, Y. Hovenier, J.N. Higgins, R. Gao, J.R. Klapwijk, T.M. Shi, S.C. Bell, A. Klein, B. Kao, T.-Y. Kumar, S. Hu, Q. Reno, J.L. Kavli Institute of NanoScience Delft University of Technology Netherlands Chinese Academy of Sciences Nanjing China Graduate School Chinese Academy of Sciences China National University of Ireland Maynooth Ireland SRON Netherlands Institute for Space Research Netherlands Bonn Germany Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge United States Sandia National Laboratories Albuquerque NM 87185-0601 United States

ISBN: (纸本)9781617823626

Superconducting heterodyne receiver has played a vital role in the high resolution spectroscopy applications for astronomy and atmospheric research up to 2THz. NbN hot electron bolometer (HEB) mixer, as the most sensitive mixer above 1.5THz, has been used in the Herschel space telescope for 1.4-1.9THz and has also shown an ultra-high sensitivity up to 5.3THz. Combined a HEB mixer with a novel THz quantum cascade laser (QCL) as local oscillator (LO), such an all solidstate heterodyne receiver provides the technology which can be used for any balloon-, air- and space-borne heterodyne instruments above 2THz. Here we report the first highresolution heterodyne spectroscopy measurement using a gas cell and using such a HEB-QCL receiver. The receiver employs a 2.9THz metal-metal waveguide QCL as LO and a NbN HEB as a mixer. By using a gas cell filled with methanol (CH3OH) gas in combination with hot/cold blackbody loads as signal source, we successfully recorded the methanol emission line around 2.918THz. Spectral lines at different pressures and also different frequency of the QCL are studied.

关键词： Gases

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Performance investigation of the joint SPM compensation in a long-haul coherent dual-polarization QPSK system

Performance investigation of the joint SPM compensation in a...

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European Conference on Optical Communication (ECOC)

作者： Shaoliang Zhang Lei Xu Pooi Yuen Kam Changyuan Yu Ting Wang Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore NEC Laboratories of America Inc. Princeton NJ USA Institute of Infocomm Research Agency for Science Technology and Research (ASTAR) Singapore Singapore

The dynamic input power range resulting in BER-3 using our proposed joint-SPM compensation scheme can be increased by 0.4 dB and 1.2 dB, compared to separately compensate for SPM at either transmitter or receiver side.

关键词： Optical transmitters Optical fiber dispersion Receivers Optical fiber polarization Joints Dynamic range

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