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2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, CLEO

作者： Erny, C. Moutzouris, K. Biegert, J. Keller, U. Kuhlke, D. Adler, F. Leitenstorfer, A. ETH Zurich Department of Physics Institute of Quantum Electronics Wolfgang-Pauli-Str. 16 CH-SOS 3 Zurich Switzerland Furtwangen University of Applied Sciences Department of Computer and Electrical Engineering Robert-Gerwig-Platz 1 78120 Furtwangen Germany Department of Physics Center for Applied Photonics University of Konstanz P.O. Box M62S D-78457 Konstanz Germany

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ISBN: (纸本)1424409306

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Low-refractive-index materials: A new class of optical thin-film materials

Low-refractive-index materials: A new class of optical thin-...

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International Conference on Numerical Simulation of Optoelectronic Devices, (NUSOD)

作者： E. F. Schubert Jong Kyu Kim Future Chips Constellation Department of Electrical Computer and Systems Engineering Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy NY USA

The refractive index, a most fundamental quantity in optics and optoelectronics, determines many figures of merit of optical components such as reflectors, filters, and resonators. Here we present a new class of optical thin-film materials that have a very low refractive index. Specular films of high optical quality with refractive indices as low as 1.05 are demonstrated. Applications of the material in optoelectronics and solid-state lighting will also be discussed.

关键词： Optical materials Optical films Optical filters Optical refraction Optical resonators Refractive index Optical devices Optical variables control Resonator filters Solid state lighting

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Decision fusion of circulating markers for breast cancer detection in premenopausal women

Decision fusion of circulating markers for breast cancer det...

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7th IEEE International Conference on Bioinformatics and Bioengineering, BIBE

作者： Jesneck, Jonathan L. Mukherjee, Sayan Nolte, Loren W. Lokshin, Anna E. Marks, Jeffrey R. Lo, Joseph Department of Biomedical Engineering Department of Statistical Science Computational Biology and Bioinformatics Program Duke Advanced Imaging Labs. Institute for Genome Sciences and Policy Department of Computer Science Duke University Department of Electrical and Computer Engineering Division of Hematology/Oncology University of Pittsburgh School of Medicine University of Pittsburgh Cancer Institute Pittsburgh PA 15213 United States Department of Experimental Surgery Duke University Medical Center Medical Physics Graduate Program Duke University Durham NC 27708 United States

ISBN: (纸本)1424415098

Current mammographic screeningfor breast cancer is less effective for younger women. To complement mammography for premenopausal women, we investigated the feasibility screening test using 98 blood serum proteins. Because the data set was very noisy and contained only weak features, we used a classifier designed for noisy data: decision fusion. Decision fusion outperformed both a support vector machine (SVM) and linear regression with forward stepwise feature selection on all three two-class classification tasks: normal tissue vs. cancer, normal tissue vs. benign lesions, and benign lesions vs. cancer. Decision fusion detected cancer moderately well (AUC=0.84 on normal vs. cancer), demonstrating promise as a screening tool. Decision fusion also detected benign lesions similarly well (AUC=0.83 on normal vs. benign lesions) and was the only classifier to achieve any success in separating benign from malignant lesions (AUC=0.64 on benign vs. cancer). The classification results suggest that the assayed proteins are more indicative of a secondary effect, such as immune response, rather than specific for breast cancer. In conclusion, the decision fusion classifier demonstrated some promise in detecting breast lesions and outperformed other classifiers, especially for the very noisy classification problem of distinguishing benign from malignant lesions. ©2007 IEEE.

关键词： Tissue

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Ellipsometrically probed plasmonic resonances in a square array of Au nanocubes

Ellipsometrically probed plasmonic resonances in a square ar...

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Quantum Electronics and Laser Science Conference (QELS)

作者： Yi-Hao Chen B. D. Lucas L. Jay Guo Department of Electrical Engineering and Computer Science USA Applied Physics University of Michigan Ann Arbor MI USA Applied Physics University of Michigan Ann Arbor 48109 USA

Localized Surface Plasmon Resonance (LSPR) of metallic nanoparticles has been widely studied for sensing applications. We propose an ellipsometry-based configuration for sensing exploiting the polarization dependent L... 详细信息

ISBN: (纸本)9781424436484

关键词： Plasmons Resonance Gold Optical polarization Nanostructures Ellipsometry Wavelength measurement Phased arrays Optical arrays Nanoparticles

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Indium Nitride as Novel THz-Radiation Source for Time-Domain THz-Systems

Indium Nitride as Novel THz-Radiation Source for Time-Domain...

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32nd International Conference on Infrared and Millimeter Waves, and 15th International Conference on Terahertz Electronics (IRMMW-THz 2007), part 1

作者： Ingrid Wilke Ricardo Ascazubi Hai Liu William Schaff Department of Physics Applied Physics & Astronomy Rensselaer Polytechnic Institute Troy NY USA Department of Electrical and Computer Engineering Cornell University Ithaca NY USA

ISBN: (纸本)9781424414383

We report an experimental study of femtosecond near-infrared optically excited THz-emission from InN thin films grown by molecular beam epitaxy (MBE) on sapphire substrates. THz-emission was investigated as a function of structural as well as electronic properties such as types of buffer layer, film thickness, electron mobilities, electron concentrations and doping of the InN with Si and Mg atoms. The THz-emission mechanism in InN has been analyzed. Ultrafast transient currents are identified as dominant THz-emission mechanisms. Ultrafast carrier recombination is identified as a limiting factor of THz-emission from n-type InN:Si.

关键词： Indium compounds Submillimeter wave generation Semiconductor epitaxial layers Semiconductor materials measurements

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A Template Based Continuous Genetic Algorithm for Image Reconstruction

A Template Based Continuous Genetic Algorithm for Image Reco...

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IEEE International Conference on Multi Topic

作者： Shahzad Ahmad Qureshi Sikander M. Mirza M. Arif Department of Computer & Information Sciences Pakistan Institute of Engineering & Applied Sciences (PIEAS) Islamabad Pakistan Department of Physics and Applied Mathematics Pakistan Institute of Engineering & Applied Sciences (PIEAS) Islamabad Pakistan Department of Electrical Engineering Pakistan Institute of Engineering & Applied Sciences (PIEAS) Islamabad Pakistan

ISBN: (纸本)1424415535;9781424415526

A template-based continuous genetic algorithm (CGA) image reconstruction methodology is proposed for tomographic image reconstruction. For the head and the lung phantoms, the proposed methodology has been found to yield higher image-quality in comparison with the conventional techniques including back-projection, filtered-back-projection, and simulated annealing techniques. Sensitivity of image-quality measures on various crossover operators including uniform, image-row, and block crossover operators has been studied and the image-row crossover has been found to yield the highest PSNR value at large values of crossover probabilities. The CGA, in terms of the PSNR values, has shown about 80% improvement compared with FBP for both head as well as lung phantoms and about 11% in the case of SA for 32 times 32 head phantom.

关键词： Genetic algorithms Image reconstruction Tomography Head Imaging phantoms Stochastic processes Sensitivity analysis Lungs Simulated annealing PSNR

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SIMULATIONS OF FIELD-PLATED AND RECESSED GATE GALLIUM NITRIDE-BASED HETEROJUNCTION FIELD-EFFECT TRANSISTORS

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International Journal of High Speed Electronics and Systems 2007年第1期17卷 19-23页

作者： Valentin O. Turin Michael S. Shur Dmitry B. Veksler Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy New York 12180 USA Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy New York 12180 USA

We report on two-dimensional isothermal simulations of recessed gate and field-plated AlGaN - GaN HFETs with submicron gates. The optimization of the recessed gate shape allows us to reduce the electric field at the drain-side gate edge by approximately 30%. Our simulations reveal a dramatic increase of the effective gate length with increasing drain-to-source bias with a commensurate decrease of the cutoff frequency (up to 40% decrease for 50V). To improve the cutoff frequency for the high drain-to-source bias, we suggest using the second field plate connected to the drain with a small gap between the two field plates. In this design, the electric field in the gap between the gate and the drain field plate is higher leading to a significant reduction of the effective gate length and, as a consequence, to an increase in the cutoff frequency at high drain-to-source biases (compared to the conventional design).

关键词： Gallium Nitride heterojunction field-effect transistor cutoff frequency

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Terahertz scattering from a rough granular surface

Terahertz scattering from a rough granular surface

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Antennas and Propagation Society International Symposium

作者： Lisa M. Zurk Brian Orlowski Garth Sundberg Zhen Zhou Antao Chen Electrical and Computer Engineering Department Portland State University Portland OR USA Applied Physics Laboratory University of Washington Seattle WA USA

ISBN: (纸本)9781424408771;1424408776

For reflection spectroscopy in particular, the measured response from an explosive material may be dominated by rough surface scattering, which is in turn influenced by a number of factors including: the size and density of explosive grains and air voids, the dielectric contrast, the angle of incidence and scattering, and the operating frequency. In this paper, scattering from a granular explosive is explored by using variable grit sandpaper as a surrogate for the explosive interface. The experimental results show that the scattered field is strongly effected by the surface roughness.

关键词： Scattering Rough surfaces Surface roughness Explosives Reflection Electrochemical impedance spectroscopy Density measurement Dielectric measurements Frequency measurement Particle measurements

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Femtosecond mid-infrared difference-frequency-generation tunable between 3.2 μm and 4.8 μm from a compact fiber source

Femtosecond mid-infrared difference-frequency-generation tun...

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Conference on Lasers and Electro-Optics (CLEO)

作者： C. Erny K. Moutzouris J. Biegert U. Keller D. Kuhlke F. Adler A. Leitenstorfer Department of Physics Institute of Quantum Electronics ETH Zurich Zurich Switzerland Department of Computer & Electrical Engineering Furtwangen University of Applied Sciences Furtwangen Germany Department of Physics and Center of Applied Photonics University of Konstanz Konstanz Germany

We demonstrate a mid-infrared laser source tunable between 3.2 mum and 4.8 mum with an average output power of more than 1 mW. The spectral bandwidth of up to 325 nm supports sub- 60-fs pulses.

ISBN: (纸本)1557528349

We demonstrate a mid-infrared laser source tunable between 3.2 mum and 4.8 mum with an average output power of more than 1 mW. The spectral bandwidth of up to 325 nm supports sub- 60-fs pulses.

关键词： Fiber lasers Ultrafast optics Power generation Pulse amplifiers Tunable circuits and devices Laser theory Optical pulses Frequency conversion Fiber nonlinear optics Optical mixing

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Femtosecond mid-infrared difference-frequency-generation tunable between 3.2 μm and 4.8 μm from a compact fiber source

Femtosecond mid-infrared difference-frequency-generation tun...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： C. Erny K. Moutzouris J. Biegert U. Keller D. Kuhlke F. Adler A. Leitenstorfer Department of Physics Institute of Quantum Electronics ETH Zurich Zurich Switzerland Department of Computer & Electrical Engineering Furtwangen University of Applied Sciences Furtwangen Germany Department of Physics and Center for Applied Photonics University of Konstanz Konstanz Germany

A broadband fiber-based femtosecond laser source, tunable in the mid-IR between 3.2 μm and 4.8 μm, exhibiting a maximum output power of more than 1 mW, and a conversion efficiency of more than 30%, is demonstrated. ... 详细信息

关键词： Optical pulse generation Pulse amplifiers Ultrafast optics Power generation Tunable circuits and devices Fiber nonlinear optics Nonlinear optics Optical mixing Laser tuning Optical fiber amplifiers

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