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Ultrafast exciton response of high optical density jaggregates from ultrathin films of cyanine dyes

Ultrafast exciton response of high optical density jaggregat...

引用

Quantum Electronics and Laser science Conference, QELS 2006

作者： Atay, Tolga Zhang, Qiang Nurmikko, Arto Tischler, Jonathan Bradley, Scott Bulovic, Vladimir Division of Engineering Department of Physics Brown University Providence RI 02912 United States Department of Electrical Engineering and Computer Science MIT Cambridge MA 02139 United States

Ultrathin films of cyanine dye J-aggregates show extraordinary exciton cross sections. Exciton dynamics are studied by ultrafast pump-probe and transient photoluminescence spectroscopy. An exciton delocalization lengt... 详细信息

ISBN: (纸本)1557528136

关键词： Ultrathin films

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Long-distance optical synchronization system for X-ray free electron lasers

Long-distance optical synchronization system for X-ray free ...

引用

Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser science Conference, CLEO/QELS 2006

作者： Ö Ilday, F. Winter, A. Schlarb, H. Chen, J. Benedict, A. Kim, J.W. Cheevers, D. Wong, D. Kärtner, F.X. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA United States Hamburg Germany MIT-Bates Linear Accelerator Center Middleton MA United States

Next generation light sources demand femtosecond-level synchronization of its subcomponents over distances of several km. We demonstrate an optical synchronization system based on distribution of mode-locked pulses ov... 详细信息

ISBN: (纸本)1557528136

关键词： Synchronization

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High-data-rate photon-counting optical communications using a NbN-nanowire superconducting detector

High-data-rate photon-counting optical communications using ...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Bryan S. Robinson Andrew J. Kerman Eric A. Dauler Richard J. Barron David O. Caplan Mark L. Stevens John J. Carney Scott. A. Hamilton Joel K. W. Yang Karl K. Berggren MIT Lincoln Laboratories Lexington USA Department of Electrical Engineering and Computer Science MIT Cambridge MA USA

We demonstrate photon-counting communications using a NbN-nanowire superconducting detector. The fast response time of this detector enables error-free communications using pulse-position modulated data at 10-GHz slot... 详细信息

ISBN: (纸本)1557528136

关键词： Detectors Photonics Receivers Optical fiber communication Sensitivity Current measurement Performance evaluation

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Incremental Deterministic Planning

Incremental Deterministic Planning

引用

International Symposium on Symbolic and Numeric Algorithms for Scientific Computing (SYNASC)

作者： Stefan Andrei Wei-ngan Chin Martin Rinard School of Computing National University of Singapore Singapore Department of Electrical Engineering and Computer Science MIT USA

We present a new planning algorithm that formulates the planning problem as a counting satisfiability problem in which the number of available solutions guides the planner deterministically to its goal. In comparison with existing planners, our approach eliminates backtracking and supports efficient incremental planners that add additional sub-formulas without the need to recompute solutions for previously provided subformulas. Our experimental results show that our approach is competitive with existing state-of-the-art planners that formulate the planning problem as a satisfiability problem, then solve the satisfiability problem using specialized off-the-shelf satisfiability solvers such as zChaff

关键词： Polynomials Tree graphs Reachability analysis Approximation algorithms Artificial intelligence Tree data structures Data structures State estimation Encoding Scientific computing

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A model of nonlinear motor cortical integration and its relation to movement speed profile control

A model of nonlinear motor cortical integration and its rela...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： F.N. Karameh S.G. Massaquoi Department of Electrical and Computer Engineering American University of Beirut Beirut Lebanon Department of Electrical Engineering and Computer Science Division of Health Sciences and Technology MIT-Harvard Cambridge MA USA

It is recognized that natural point-to-point movements are characterized by bell-shaped speed profiles. However, the neural basis of this smooth, substantially symmetric time course is unknown. Here it is demonstrated via a simplified compartmental model of tufted layer V (TL5) pyramidal neurons, the principal output units of the motor cortex, that nonlinear integration may underlie the bell-shaped profile. Specifically, it is shown that TL5 neuronal output depends upon an approximately multiplicative relationship between inputs to its apical or basal regions (zones A and B, respectively) and those to its central zone (C). This is because the latter facilitate Ca 2+ dependent bursting that enhances responsiveness to other inputs. As a result, when part of TL5 output returns to zones A and C via thalamocortical and cerebrocerebellar feedback, TL5 neuronal firing rate initially increases before decreasing, rather than progressively decrease as would the output of a linear integrator. This yields a sigmoidal position vs. time response in the musculoskeletal plant and therefore a bell-shaped speed curve. Because of this mechanism, smooth movements may be triggered and modulated by step-like and tonic inputs to zone C as might be received from SMA or basal ganglia. The model thus gives possible insight into the basis of certain features of motor dysfunction in Parkinson's and cerebellar disease

关键词： Character recognition Brain modeling Neurons Delay Output feedback Neurofeedback Time factors Musculoskeletal system Basal ganglia Parkinson's disease

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A microfabricated electrospray thruster using ridge emitters and ceramic-ball extractor location

A microfabricated electrospray thruster using ridge emitters...

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AIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference

作者： Gassend, B. Velásques-García, L.F. Lozano, P.C. Akinwande, A.I. Martínez-Sánchez, M. Massachusetts Institute of Technology Cambridge MA 02139 United States MIT Department of Electrical Engineering and Computer Science 32 Vassar Street Cambridge MA 02139 United States AIAA United States MIT Department of Aeronautics and Astronautics Microsystems Technology Laboratories 77 Massachusetts Avenue Cambridge MA 02139 United States MIT Department of Aeronautics and Astronautics 77 Massachusetts Avenue Cambridge MA 02139 United States Department of Electrical Engineering and Computer Science 77 Massachusetts Avenue Cambridge MA 02139 United States Department of Aeronautics and Astronautics 77 Massachusetts Avenue Cambridge MA 02139 United States

ISBN: (纸本)1563478188

We describe the fabrication and testing of an 1 cm by 1 cm microfabricated externally wetted electrospray thruster, which uses the ionic liquid EMI-BF4 as a propellant. In an electrospray thruster, an electrostatic field is used to extract ions or charged droplets from a liquid placed at the tip of a needle, and accelerate them. The novelty of our design is in the use of microfabricated ridges with regularly spaced tips as emitters, as well as the use of ceramic balls to position the extractor grid relative to the emitters and ensure electrical insulation. After describing the design of the thruster, we present the test firings we have done to date. In these tests, emission starts around 2 kV. To the best of our knowledge, this is the first time an externally wetted electrospray thruster has been fired with an integrated extractor electrode. Emission patterns gathered by firing into an aluminum plate show that the tips placed along the ridge allow emission to occur at multiple points along the ridge;without the tips, emission only occurs at the ends of the ridges.

关键词： Electrostatics

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Ultrafast exciton response of high optical density J-aggregates from ultrathin films of cyanine dyes

Ultrafast exciton response of high optical density J-aggrega...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Tolga Atay Qiang Zhang Arto Nurmikko Jonathan Tischler Scott Bradley Vladimir Bulovic Division of Engineering and Department of Physics Brown University Providence RI USA Department of Electrical Engineering and Computer Science MIT Cambridge MA

ISBN: (纸本)1557528136

关键词： Films Excitons Nonlinear optics Optical pumping Optical films Ultrafast optics Absorption

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Light enhancement and formation of photonic band gaps in aperiodic waveguide structures

Light enhancement and formation of photonic band gaps in ape...

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Photonic Metamaterials: From Random to Periodic, META 2006

作者： Hiltunen, M. Dal Negro, L. Feng, N.-N. Kimerling, L.C. Michel, J. Technical Research Centre of Finland Kaitoväylä 1 90570 Oulu Finland MIT Department of Materials Science and Engineering 77 Massachusetts Avenue Cambridge MA 02139 United States Boston University Department of Electrical and Computer Engineering 8 Saint Mary's Street Boston MA 02215 United States

Novel design of complex waveguide structures that guide light due to the excitation of multiple resonant transmission states induced by aperiodic Thue-Morse environment is presented. We illustrate bandgaps and localiz... 详细信息

ISBN: (纸本)155752808X

关键词： Photonic band gap

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Xenon Difluoride dry etching of Si, SiGe alloy and Ge

Xenon Difluoride dry etching of Si, SiGe alloy and Ge

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Third International SiGe Technology and Device Meeting, ISTDM 2006

作者： Guangchi, Xuan Adam, Thomas N. Suehle, John Fitzgerald, Eugene Lv, Pengcheng Sustersic, Nathan Coppinger, Matthew John Kolodzey, James Electrical and Computer Engineering Department University of Delware Newark DE 19716 United States National Institute of Standards and Technology Gaithersburg Maryland 20899 United States Materials Science and Engineering Department MIT Cambridge MA United States IBM Corp 1101 Kitchawan Road Route 134 Yorktown NY 10598 United States

No abstract available

ISBN: (纸本)1424404614

No abstract available

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Laser spike annealing of strained Si/ strained Si0.3Ge 0.7/ relaxed Si0.7Ge0.3 dual channel high mobility p-MOSFETs

Laser spike annealing of strained Si/ strained Si0.3Ge 0.7/ ...

引用

Advanced Gate Stack, Source/Drain, and Channel engineering fo Si-Based CMOS 2: New Materials, Processes, and Equipment - 210th Electrochemical Society Meeting

作者： Chléirigh, C. Ní Wang, X. Rimple, G. Wang, Y. Canonico, M. Theodore, N.D. Olubuyide, O.O. Hoyt, J.L. Department of Electrical Engineering and Computer Science MIT Bldg. 39-661 60 Vassar St. Cambridge MA 02139 United States Ultratech Inc. San Jose CA United States Freescale Semiconductor Inc. Tempe AZ United States

ISBN: (纸本)1566775027

Sub-melt temperature laser spike annealing is investigated as a low thermal budget solution for source/drain annealing in strained Si/strained Si 0.3Ge0.7/relaxed Si0.7Ge0.3 dual channel p-MOSFETs. A constant hole mobility enhancement factor of 4x is maintained relative to Si control MOSFETs, for laser annealing temperatures up to approximately 1000°C. This temperature is significantly higher than possible with rapid thermal annealing, due to device degradation associated with Ge diffusion during rapid thermal annealing. Mobility is found to decrease dramatically in the heterostructure MOSFETs for laser annealing temperatures above ∼ 1000°C. SIMS analysis shows very little Ge diffusion, even for an 1100°C laser anneal. Capacitance-voltage analysis and Raman spectroscopy suggest that there is some strain relaxation for the 1100°C anneal. Transmission electron microscopy analysis indicates localized strain variation and defects on the order of 107 cm-2 for the heterostructure MOSFET subject to laser annealing at 1100°C. The mobility degradation for LSA temperatures above ∼ 1000°C is consistent with a combination of strain relaxation and scattering from defects (the strained Si0.3Ge0.7 film thickness is ∼ 2X the equilibrium critical thickness). Good boron activation is achieved in the SiGe heterostructure with laser spike annealing. copyright The Electrochemical Society.

关键词： MOSFET devices

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