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Fabrication and process characterization of atom transistor chips

Fabrication and process characterization of atom transistor ...

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TRANSDUCERS 2009 - 15th International conference on Solid-State Sensors, Actuators and Microsystems

作者： Chuang, H.C. Salim, E.A. vuletic, v. Anderson, D.Z. Bright, v.M. Department of Mechanical Engineering University of Colorado Boulder CO United States Department of Mechanical Engineering National Taipei University of Technology Taipei Taiwan Department of Physics University of Colorado Boulder CO United States Harvard Center for Ultracold Atoms Massachusetts Institute of Technology Cambridge MA United States

ISBN: (纸本)9781424441938

This paper describes the design and fabrication of an atom chip for atom tunneling experiments. A fabrication process was developed that uses a combination of Uv-optical and Electron-Beam lithography to pattern micrometer and nanometer scale copper wires on a single chip. The minimum wire width fabricated in this work is 200nm. The wires can carry current densities of more than 7.5107 A/cm2. The electrical current tests establish the feasibility of realizing chip-based atom tunneling experiments. ©2009 IEEE.

关键词： Atoms

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A control system design for the optimal bias point of external modulator

A control system design for the optimal bias point of extern...

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9th International conference on Electronic Measurement and Instruments, ICEMI 2009

作者： Yinan, Chen Xiaoqing, Zhang Dong, Li School of Optoelectronic Information and Telecommunication Engineering Beijing Information Science and Technology University Beijing 100192 China

ISBN: (纸本)9781424438624

This paper deals with the effects of direct current bias voltage to X-cut y conduction Mach-Zehnder intensity modulator's export optical power, and achieves a cosine function equation of direct current bias voltage versus export optical power of modulator. The modulator works on an approximate linear region nearby the optimal bias point v/2(±10mv). Considering the approximate linear region's range of variation is infinitesimal, a high-accuracy digital signal processing (DSP) control system has been designed which achieves precise control for the optimal bias point, in addition, its control precision can be attained 1mv. ©2009 IEEE.

关键词： Bias voltage

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Low-threshold terahertz quantum-cascade lasers with one-well injector operating up to 174 K

Low-threshold terahertz quantum-cascade lasers with one-well...

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conference on Lasers and Electro-Optics, CLEO 2009

作者： Kumar, Sushil Hu, Qing Reno, John L. Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States Sandia National Laboratories Center of Integrated Nanotechnologies MS 1303 Albuquerque NM 87185-1303 United States

ISBN: (纸本)9781557528698

We report operation of v ~ 2:7 THz quantum-cascade lasers (QCLs) up to 174 K. A new three-well active region, one-well injector scheme is utilized to lower the operating current densities. While the temperature performance of this design is comparable to that of the best published THz QCLs, lower operating current densities make this design a viable alternative. © 2008 optical Society of America.

关键词： Quantum cascade lasers

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A low-voltage low-power comparator with current-controlled dynamically-biased preamplifiers for DCM buck regulators

A low-voltage low-power comparator with current-controlled d...

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2009 16th IEEE International conference on Electronics, Circuits and Systems, ICECS 2009

作者： Lee, Hoi Department of Electrical Engineering University of Texas at Dallas Richardson TX 75080-3021 United States

ISBN: (纸本)9781424450916

Comparator-controlled power switch has been widely used to improve power efficiencies of discontinuous-conductionmode (DCM) buck regulators. Some major design challenges are capabilities oy the comparator to operate at low voltage and dissipate low power for low-voltage DCM buck regulators having high power efficiencies under light-load condition. This paper presents a new comparator with current-controlled dynamicallybiased preamplifiers. current-controlled dynamic biasing (CCDB) is developed to lowe. The required supply voltage for realizin. The autozeroing technique i. The preamplifier, thereby allowin. The proposed comparator to operate at lower supply voltage compared to that using conventional preamplifiers. The proposed CCDB technique also minimize. The current consumption oy the comparator under different input amplitudes. Implemented in a standard 0.35-μm CMOS process with vthn ≈ |vthp| = 0.7 v. The comparator can operate down to 1.2 v and achieve 8-bit resolution at 20 MS/s while only consuming 7-μA current. ©2009 IEEE.

关键词： Comparators (optical)

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Glottal Space Segmentation from Motion Estimation and Gabor Filtering

Glottal Space Segmentation from Motion Estimation and Gabor ...

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Annual International conference of the IEEE-engineering-in-Medicine-and-Biology-Society

作者： Mendez, A. Ismaili Alaoui, E. M. Garcia, B. Ibn-Elhaj, E. Ruiz, I. Univ Deusto Bilbao Spain Univ Mohamed V Rabat Agdal Morocco Fac Sci Rabat Morocco Natl Inst Post & Telecommun Rabat Morocco

ISBN: (纸本)9781424432950

Obtaining the glottal space segmentation is essential to characterize morphological disorders of vocal folds. In this study, the tested images are been acquired by direct optical inspection of the glottis using an endoscope and most of them are very poor quality. The application of motion estimation is very useful to segment the vocal folds endoscopic videos without user interaction. This approach involves three process steps: 1) Wiener motion estimator - to shift the measurement the next frame regarding to the current frame, and look for similarities between them. The best matching will accurate a shift equal to the displacement vector of the object;2) Segmentation using motion estimation results and applying Gabor filtering;3) Experimental results to demonstrate that the proposed method is effective. Our proposal works correctly with 95% of database test videos and it shows a great advance in design, and in the nearby future, a complete method to diagnose vocal folds pathologies.

关键词： Motion estimation

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Trends in industrial oil analysis - A review

Trends in industrial oil analysis - A review

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6th International conference on Condition Monitoring and Machinery Failure Prevention Technologies 2009

作者： vähäoja, Pekka O. Pikkarainen, Harri v. S. University of Oulu Department of Mechanical Engineering Machine Design Laboratory P.O. Box 4200 FI-90014 Oulu Finland Kemi-Tornio University of Applied Sciences Optical Measurement Laboratory Kiveliönkatu 36 FI-94600 Kemi Finland

ISBN: (纸本)9781618390097

This article is a literature review of current trends in industrial oil analysis. The most significant off-line (laboratory) oil analysis techniques i.e. wear metal analysis, solid debris analysis and additive analysis are presented with some application remarks. Because more real-time data is continuously required in industry to support maintenance decisions, on- and in-line oil analysis techniques are especially concentrated on in the review of current literature. Especially solid debris and other contaminant analyzers and oil condition sensors are discussed thoroughly. Certain commercial players in the industrial oil analysis field, like lubricant manufacturers, oil analysis laboratories, machine manufacturers and measurement instrument manufacturers, are handled as well. Comparison of oil analysis techniques with vibration monitoring and acoustic emission is carried out.

关键词： Debris

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Bidirectional electrothermal electromagnetic torsional microactuators

Bidirectional electrothermal electromagnetic torsional micro...

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22nd IEEE International conference on Micro Electro Mechanical Systems, MEMS 2009

作者： Youngkee, Eun Hyungjoo, Na Jongbaeg, Kim School of Mechanical Engineering Yonsei University Seoul Korea Republic of

ISBN: (纸本)9781424429776

This paper presents a novel design of bidirectional torsional micromirror utilizing vertically driven electrothermal electromagnetic silicon beam actuators to generate large static angular motion. The microactuators are fabricated on silicon-on-insulator (SOI) wafer using three photo masks in order to form two different thicknesses of single crystal silicon (SCS) device layer and backside cavities. When the driving bias is applied to the device, four buckle beams placed alongside of the torsion bars are subjected to thermal expansion and buckle in vertical direction generating torsional displacement of the micromirror with respect to two torsion bars placed at the center. The direction of buckle is controlled by Lorentz force caused by the magnetic field applied and the amount of current flowing through the micro beam to be buckled, enabling the bidirectional motion of the torsional micromirror. The maximum static angular displacement of the torsional actuator is up to 14.35& deg;(28.7& deg;, optical angle) under driving DC voltage of 7.5v. For resonance mode operation, the measured angular displacement is 8.46& deg;(16.92& deg;, optical angle) at 10.94 kHz under sinusoidal driving voltage of 0 to 3v. ©2009 IEEE.

关键词： Thermal expansion

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The design of wide BW frequency synthesizer based on the DDS&PLL hybrid method

The design of wide BW frequency synthesizer based on the DDS...

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9th International conference on Electronic Measurement and Instruments, ICEMI 2009

作者： Li, YongKe Department of Optical and Electronic Engineering Ordnance Engineering College Shijiazhuang 050003 China

ISBN: (纸本)9781424438624

Frequency synthesizer is an important component in the modem electronic systems. This paper studied a kind of frequency synthesizer in the UAv system and put forward an improvement method for DDS (Direct Digital Synthesis) &PLL (Phase Locked Loop) hybrid frequency synthesizer. Be further to raise PLL performance in fast locking and noise immunity ability in the improvement method, a PLL with Analog Adaptive Bandwidth Control (AABC) has been designed in this paper. The new-type AABC has been presented based on conventional Charge pump PLL circuit. The PLL with AABC block can control the loop bandwidth according to the locking status and the amount of inputs' phase error adaptively;and consequently low-noise and fast-lock performance are achieved. End, the designed Frequency synthesizer satisfies an 800MHz to 1.8GHz output range and a 0.4ms maximum conversion time. Working at 900MHz, the phase noises are-93dBc/Hz at 200 kHz offset, and the whole circuit draws 8.7mA current from 3.0v supply. ©2009 IEEE.

关键词： Phase locked loops

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current status of closed-form Green's functions in layered media composed of natural and artificial materials

Current status of closed-form Green's functions in layered m...

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International conference on Electromagnetics in Advanced Applications (ICEAA)

作者： M. I. Aksun Aytac Alparslan K. A. Michalski Department of Electrical and Electronics Engineering Koc University Istanbul Turkey Department of Information Technology and Electrical Engineering Swiss Federal Institute of Technology Zurich Switzerland Department of Electrical and Computer Engineering Texas A and M University College Station TX USA

This paper provides an overview of the development of closed-form Green's functions in planar multilayered structures, with an emphasis given to the discrete complex image method (DCIM). In addition to the review of the materials in the literature, the latest developments on DCIM and its applications to artificial materials are also discussed.

关键词： Green's function methods Nonhomogeneous media Algorithm design and analysis Sampling methods Closed-form solution Surface fitting optical design Radio frequency High speed optical techniques Microwave circuits

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Low-threshold Terahertz quantum-cascade lasers with one-well injector operating up to 174 K

Low-threshold Terahertz quantum-cascade lasers with one-well...

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conference on Lasers and Electro-Optics (CLEO)

作者： Sushil Kumar Qing Hu John L. Reno Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Center of Integrated Nanotechnologies Sandia National Laboratories Albuquerque NM USA

We report operation of v ~ 2.7 THz quantum-cascade lasers (QCLs) up to 174 K. A new three-well active region, one-well injector scheme is utilized to lower the operating current densities. While the temperature performance of this design is comparable to that of the best published THz QCLs, lower operating current densities make this design a viable alternative.

关键词： Quantum cascade lasers current density Temperature optical receivers Semiconductor lasers optical mixing Frequency Quantum computing Laser theory Laboratories

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