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Gratings on porous silicon structures for sensing applications

Gratings on porous silicon structures for sensing applicatio...

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Conference on Lasers and Electro-Optics, CLEO 2009

作者： Liscidini, M. Wei, X. Kang, C. Rong, G. Retterer, S.T. Patrini, M. Sipe, J.E. Weiss, S.M. Department of Physics University of Toronto 60 St. George St Toronto M5S 1A7 ON Canada Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 United States CNISM and Dipartimento di Fisica 'A. Volta' Università degli Studi di Pavia via Bassi 6 27100 Pavia Italy

We investigate the use of gratings on porous silicon structures for sensing applications. Examples of two classes of systems are studied: grating-coupled waveguide biosensors, and diffraction-based biosensors. © ... 详细信息

ISBN: (纸本)9781557528698

关键词： Biosensors

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Models for analyzing cognitive radio interference to wireless microphones in TV bands

Models for analyzing cognitive radio interference to wireles...

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2008 3rd IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks, DySPAN 2008

作者： Dhillon, Ramandeep S. Brown, Timothy X. Interdisciplinary Telecommunication Program Electrical and Computer Engineering Department University of Colorado Boulder CO 80309-0530 United States

ISBN: (纸本)9781424420179

TV bands are candidates for unlicensed spectrum access based on cognitive radio (CR) devices. However, for a successful dynamic spectrum access regime in TV bands, any new unlicensed devices need to ensure that they do not interfere with the incumbent devices such as TV receivers and wireless microphones in these bands. This paper presents models for carrying out interference analysis of CR devices to wireless microphones. The wireless microphone systems are more susceptible to interference by CR devices compared to TV receivers due to their lower power and use of randomly selected idle TV bands at a given location. We present two models for interference, a single interferer model that determines the unlicensed device characteristics needed to protect a wireless microphone system from interference, and a multiple interferers model that provides a measure of the maximum density of unlicensed devices that can operate in a given region without affecting wireless microphone systems. We further analyze the benefits of cooperative sensing among CR devices using the multiple interferers model. Lastly, we provide recommendations for reducing interference based on the two interference models. ©2008 IEEE.

关键词： Cognitive radio

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Models for Analyzing Cognitive Radio Interference to Wireless Microphones in TV Bands

Models for Analyzing Cognitive Radio Interference to Wireles...

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IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, DySPAN

作者： Ramandeeep S. Dhillon Timothy X. Brown Interdisciplinary Telecommunication Program Electrical and Computer Engineering Department University of Colorado Boulder USA

TV bands are candidates for unlicensed spectrum access based on cognitive radio (CR) devices. However, for a successful dynamic spectrum access regime in TV bands, any new unlicensed devices need to ensure that they do not interfere with the incumbent devices such as TV receivers and wireless micro phones in these bands. This paper presents models for carrying out interference analysis of CR devices to wireless microphones. The wireless microphone systems are more susceptible to interference by CR devices compared to TV receivers due to their lower power and use of randomly selected idle TV bands at a given location. We present two models for interference, a single interferer model that determines the unlicensed device characteristics needed to protect a wireless microphone system from interference, and a multiple interferers model that provides a measure of the maximum density of unlicensed devices that can operate in a given region without affecting wireless microphone systems. We further analyze the benefits of cooperative sensing among CR devices using the multiple interferers model. Lastly, we provide recommendations for reducing interference based on the two interference models.

关键词： Wireless communication Microphones Chromium Interference Wireless sensor networks Receivers TV

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Light scattering by white-emitting CdSe nanocrystals and traditional YAG:Ce3+ phosphor particles

Light scattering by white-emitting CdSe nanocrystals and tra...

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2008 MRS Fall Meeting

作者： Gosnell, Jonathan D. Weiss, Sharon M. Interdisciplinary Graduate Program in Materials Science Vanderbilt University Station B 350106 Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University Station B 351824 Nashville TN 37235 United States

ISBN: (纸本)9781615677740

In order for solid state lighting technology to become a mainstream technology, one of the major challenges to overcome is increasing the efficiency of these devices while maintaining a proper color balance. A significant source of efficiency loss in commercial phosphor-based white light-emitting diodes (LEDs) is light scattering off large, micron-sized phosphor particles. The use of recently reported single-size CdSe white-light nanocrystals in place of traditional phosphors, such as YAG:Ce3+, could lead to lower scattering losses and higher device efficiencies as a result of the extremely small CdSe core diameter of approximately 1.5 nm. This work theoretically and experimentally investigates the absorption, scattering, and extinction coefficients and cross sections of CdSe white-light nanocrystals in comparison to YAG:Ce3+ phosphor particles. Calculations were performed based on the Rayleigh approximation and Mie theory of scattering. Experiments were carried out using thin films of encapsulated nanocrystals. By measuring the absorbance and thickness of the films, in addition to the concentration of the nanocrystals, extinction coefficients and cross sections were determined using the Beer-Lambert law. A reasonable agreement was obtained between theoretical and experimental data showing that the size of the particle has a significant impact on the extinction, absorption, and scattering properties of thin films. The considerably reduced scattering from the nanocrystals compared to traditional phosphors, along with their inherent high quality white light emission, makes them a promising candidate for future solid state lighting applications. © 2009 Materials Research Society.

关键词： Cadmium compounds

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Gate-length and drain-bias dependence of band-to-band tunneling-induced drain leakage in irradiated fully depleted SOI devices

Gate-length and drain-bias dependence of band-to-band tunnel...

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作者： Mamouni, Farah E. Dixit, Sriram K. Schrimpf, Ronald D. Adell, Philippe C. Esqueda, Ivan S. McLain, Michael L. Barnaby, Hugh J. Cristoloveanu, Sorin Xiong, Weize Electrical Engineering and Computer Science Department Vanderbilt University Nashville TN 37232 United States Interdisciplinary Materials Science Program Vanderbilt University Nashville TN 37235 United States Jet Propulsion Laboratory Pasadena CA 91109 United States Department of Electrical Engineering Arizona State University Tempe AZ 85287 United States IMEP-INP Grenoble MINATEC 38016 Grenoble France Texas Instruments Inc. Dallas TX 75808 United States

The effects of gate length and drain bias on the off-state drain leakage current of irradiated fully-depleted SOI $n$-channel MOSFETs are reported. The experimental results are interpreted using a model based on the combined effects of band-to-band tunneling (BBT) and the trapped charge in the buried oxide. For negative gate-source voltages, the drain leakage current increases with the drain voltage because the electric field in the gate-to-drain overlap region is increasing. The off-state current in these devices increases with total ionizing dose due to oxide trapped charge build up in the buried oxide, enhanced by the BBT mechanism. The experimental data show that these effects are more significant for devices with shorter gate-lengths. Simulation results suggest that the BBT-generated holes are more likely to drift all the way from the drain to the source in shorter devices, enhancing the drain leakage current, while they tend to tunnel across the gate oxide in longer devices. © 2006 IEEE.

关键词： MOSFET devices

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Nanoscale porous silicon waveguides for biosensing applications

Nanoscale porous silicon waveguides for biosensing applicati...

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21st Annual Meeting of the IEEE Lasers and Electro-Optics Society, LEOS 2008

作者： Rong, G. Wei, X. Kang, C. Liscidini, M. Sipe, J.E. Mernaugh, R.L. Weiss, S.M. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics Institute for Optical Sciences University of Toronto Toronto ON M5S 1A7 Canada Department of Biochemistry Vanderbilt University Nashville TN 37235 United States

Nanoscale porous silicon waveguides, both on silicon substrates and free-standing membranes, are explored for biosensing applications. Measured detection limits in the nanomolar range are reported for DNA sensing. ... 详细信息

ISBN: (纸本)9781424419326

关键词： Porous silicon

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Material analysis and characterization of cesium iodide (CsI) coated C fibers for field emission applications

Material analysis and characterization of cesium iodide (CsI...

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IEEE International Conference on Plasma Science (ICOPS)

作者： Vasilios Vlahos Dane Morgan John H. Booske Interdisciplinary Materials Science Program Madison WI USA University of Wisconsin Madison Madison WI US Department of Electrical and Computer Engineering University of Wisconsin Madison Madison WI USA

Field emission cathodes consisting of cesium iodide (CsI) coated graphite fibers have been investigated as promising electron sources for high power microwave (HPM) devices. After conditioning for removing adsorbed water vapor, these cathodes have operated stably for more than one million pulses and release little or no plasma. One of the most useful properties of the Csl coatings appears to be a significant reduction in turn-on electric fields compared to un-coated graphite fiber cathodes. Computational investigations of the modification of the electronic properties of a C surface upon adsorption of both isolated and crystalline thin layers of Csl have been performed, indicating that these adsorbed layers are capable of significantly improving the emission properties of the C fibers by forming surface dipole layers . These layers are predicted to alter the electrostatic potential barrier for electron emission of the surface and lower the overall work function of the system from ~4.5 eV (pure graphite) down to ~1.2 - 1.4 eV. In order to further correlate the microscopic properties of the material system with the computational results obtained and the macroscopic performance characteristics of these cathodes, a series of materials characterizations are being carried out on the cathodes. These studies will facilitate the determination of both bulk and surface elemental composition of the cathodes, provide the value of the surface work function, determine the micro-morphological characteristics of the cathode's surface as well as the micro-structural characteristics of the bulk, and identify the role of any interface regions on the emission properties of the cathode. A more complete understanding of the mechanism(s) responsible for the superior emission characteristics of Csl coated C fibers and the nano-physics of the system will be obtained.

关键词： Cathodes Surface morphology Materials Optical fiber devices Plasmas Coatings Surface treatment

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Nanoscale porous silicon waveguides for biosensing applications

Nanoscale porous silicon waveguides for biosensing applicati...

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IEEE Photonics Conference (IPC)

作者： G. Rong X. Wei C. Kang M. Liscidini J. E. Sipe R. L. Mernaugh S. M. Weiss Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN USA Department of Physics and Institute for Optical Sciences University of Toronto Toronto ONT Canada Department of Biochemistry Vanderbilt University Nashville TN USA

关键词： Silicon Biosensors Optical waveguides Gratings Biomembranes Resonance DNA Biological materials Optical materials Optical surface waves

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Trends and precedents favoring a regulatory embrace of smart radio technologies

Trends and precedents favoring a regulatory embrace of smart...

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2nd IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, DySpan 2007

作者： Bernthal, J. Brad Brown, Timothy X. Hatfield, Dale N. Sicker, Douglas C. Tenhula, Peter A. Weiser, Philip J. Interdisciplinary Telecommunication Program Law School University of Colorado Boulder United States Interdisciplinary Telecommunication Program Electrical and Computer Engineering Department University of Colorado Boulder United States Interdisciplinary Telecommunication Program University of Colorado Boulder United States Department of Computer Science Interdisciplinary Telecommunication Program University of Colorado Boulder United States Shared Spectrum Company Vienna VA United States

ISBN: (纸本)1424406633

Burgeoning demands for communications bandwidth stress the abilities of military and civil spectrum managers to provide needed access to spectrum resources while taking appropriate measures to avoid causing harmful interference to legacy users. Empirical analysis shows that radio frequency (RF) bandwidth is often available: measurement data indicate that while most channels are used at some times, most channels remain unused at any given time. Going forward, so-called "smart radio" technologies will be able to exploit these holes in the RF spectrum and will play a crucial role in achieving the core objectives of efficient spectrum management. The United States Defense Advanced Research Projects Agency's ("DARPA") NeXt Generation Communications program ("XG") is on the vanguard of smart radio innovations. In particular, XG technology uses automated intelligence at a system's edges in order to navigate real-time fluctuations in spectral conditions that cannot be precisely predicted in advance. This dynamism will enable opportunistic use of intermittently available spectrum. This paper examines how the introduction of smart radio technologies fit within past precedents and current regulatory developments involving shared use of spectrum resources. The key finding is that implementation of smart radios in the near term would represent an incremental policy step that is consistent with policy trends and recent regulatory actions. Two perspectives militate in favor of this conclusion. First, smart radio systems enable regulators and spectrum managers to more efficiently achieve long-held policy and spectrum management objectives. And second, the regulatory prospects of smart radios are further buoyed by contemporary examples of approved technologies and sharing methods that are modest precursors to XG. Case studies are used to underscore that while smart radios promote vast gains in spectrum accessibility and interference avoidance, implementation of smart radio systems f

关键词： Radio communication

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Cooperative university/industry development of a freshman 'introduction to ECE design' course

Cooperative university/industry development of a freshman 'i...

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114th Annual ASEE Conference and Exposition, 2007

作者： Williams, Douglas Butera, Robert Uluagac, Selcuk Clark, Matthew Deck, Andy Torba, Michael Trahan, Steven Georgia Institute of Technology United States Undergraduate Affairs School of Electrical and Computer Engineering Georgia Tech. Georgia Department of Electrical and Computer Engineering Interdisciplinary Bioengineering Graduate Program Georgia Tech. United States Georgia Tech. School of Electrical and Computer Engineering United States National Instruments National Instruments Austin TX United States

Faculty members from Georgia Tech's School of electrical and computer engineering (ECE) have worked jointly with engineers from National Instruments (NI) to develop a new freshman engineering course. This course is entitled 'Introduction to ECE Design' and is constructed around the use of the LEGO MINDSTORMS NXT robotics system. NI partnered with LEGO to jointly develop the programming software for the MINDSTORMS NXT, and their engineers are uniquely positioned to provide insight into the use and functionality of these kits. NI engineers have not only provided technical support but have also conceived and designed most of the laboratories for the course. This course addresses the diverse objectives of providing students with a systems-level design experience at the beginning of their academic programs and introducing them to a broad range of ECE disciplines. A primary goal is to enable students to make better-informed decisions when choosing whether or not to major in electrical engineering or computer engineering. © American Society for engineering Education, 2007.

关键词： Systems engineering

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