On the Cross Roads of Biology and Nanotechnology – Selective DNA Nanopore Sensors

01 Jun 2007 | Online Presentations | Contributor(s): Samir Iqbal

The ability to manipulate and identify the properties of single biological molecules with the potential of characterizing biological processes at the most fundamental levels can significantly facilitate rapid diagnostics and therapeutics. Fabrication of solid-state devices investigating …

Computer Simulation of Nanoparticles, Viruses, and Electrical Power-Generating Bacteria

20 Mar 2007 | Online Presentations | Contributor(s): Peter J. Ortoleva

Models of cells and nanometer-scale biosystems are presented that clarify their physico-chemical characteristics and allow for computer- aided design of therapeutic and nanotechnical devices. Multiscale techniques are used to obtain rigorous, coarse-grained equations for the migration …

Dendrimer-Templated Catalyst for Controlled Growth of Single-Wall Carbon Nanotubes by Plasma-Enhanced CVD

21 Feb 2007 | Online Presentations | Contributor(s): Placidus Amama

Carbon nanotubes (CNTs) are an important class of materials with several technological applications because they possess unparalleled properties in terms of ballistic electrical conductivity, thermal conductivity, tensile strength, and sensitivity to chemical and biological agents. To exploit these …

Electron Emission from Nanoscale Carbon Materials

15 May 2007 | Online Presentations | Contributor(s): Timothy S Fisher

Prior studies on electron emission show possibly beneficial effects of nanoscale phenomena on energy-conversion characteristics. For example, recent work has shown that the electric field around a nanoscale field emission device can increase the average energy of emitted electrons. We consider …

Introduction to X-ray Photoelectron Spectroscopy and XPS Application for Biologically Related Objects

26 Feb 2007 | Online Presentations | Contributor(s): Dmitry Zemlyanov

X-ray Photoelectron Spectroscopy (XPS), which is known as Electron Spectroscopy for Chemical Analysis (ESCA), is a powerful research tool for the study of the surface of solids. The technique becomes widely used for studies of the properties of atoms, molecules, solids, and surfaces. The main …

"Ab Initio" Theory of Novel Micro and Nanolasers

19 May 2008 | Online Presentations | Contributor(s): A. Douglas Stone

While the laser is one of the most important inventions of the past century and one of the most interesting and controllable non-linear systems in physics, there is surprisingly little predictive theory of lasing properties. Predicting lasing thresholds and output power far above threshold in the …

Plasmonic Metamaterials: Unusual Optics and Applications

28 Feb 2008 | Online Presentations | Contributor(s): Igor Smolyaninov

Surface plasmon-polaritons (or plasmons) are collective excitations of the conduction electrons and the electromagnetic field on the surface of such good metals as gold and silver. Near the frequency of surface plasmon resonance plasmons may perceive regular dielectrics as negative index …

Hexagonal Prism Blue Diode Laser Using Whispering Gallery Mode (WGM) Resonances

23 Oct 2007 | Online Presentations | Contributor(s): Sangho Kim

Semiconductor lasers have many important applications, including communication technologies, optical storage, printing, and molecular detection. The range of applications could be broadened significantly if the lasers could be made smaller and with lower threshold currents. Today’s in-plane …

Highly Efficient Thermal Transport: The Application of Carbon Nanotube Array Interfaces

01 Feb 2007 | Online Presentations | Contributor(s): Baratunde A. Cola

Carbon nanotubes (CNTs) have received much attention in recent years for their extraordinary properties that through careful engineering may be leverage for the development of numerous advantageous applications. However, to date, only few CNT based applications exist in the market place. So when …

Linear and Nonlinear Optical Devices Based on Slow Light Propagation: Figures of Merit

19 May 2008 | Online Presentations | Contributor(s): Jacob B. Khurgin

Performance of optical delay lines and nonlinear devices based on slow wave propagation in photonic crystal waveguides in the presence of higher order dispersion is analyzed and compared with other slow light schemes, such as coupled resonators, media with electromagnetically-induced …

Ripples and Warping of Graphene: A Theoretical Study

08 Jun 2010 | Online Presentations | Contributor(s): Umesh V. Waghmare

We use first-principles density functional theory based analysis to understand formation of ripples in graphene and related 2-D materials. For an infinite graphene, we show that ripples are linked with a low energy branch of phonons that exhibits quadratic dispersion at long wave-lengths. Many …

Silicon Spintronics

04 Jun 2008 | Online Presentations | Contributor(s): Ian Appelbaum

"Electronics" uses our ability to control electrons with electric fields via interaction with their fundamental charge. Because we can manipulate the electric fields within semiconductors, they are the basis for microelectronics, and silicon (Si) is the most widely-used semiconductor for …

X-ray Diffraction and Reflectivity Analysis of Thin Films and Nanomaterials

29 Dec 2009 | Online Presentations | Contributor(s): Mauro Sardela

A review of x-ray analysis techniques applied to the characterization of nanomaterials will be presented with focus on x-ray lab source instrumentation similar to the facilities available at the Birck Nanotechnology Center. Practical aspects of data acquisition and interpretation using x-ray …

Transmission of images with subwavelength resolution to distances of several wavelengths in microwave, terahertz and infrared ranges

08 Apr 2008 | Online Presentations | Contributor(s): Pavel Belov

The resolution of conventional imaging systems is restricted by the diffraction limit: the details smaller than half-wavelength of radiation cannot be resolved. Using novel engineered media with extreme optical anisotropy and their waveguiding properties it is possible to overcome the classical …

Understanding Deformation Processes in Nanocrystalline Metals Through the Use of Real-time Electron Microscopy Techniques

03 May 2007 | Online Presentations | Contributor(s): Eric Stach

It is has long been known that the grain size of a material has a substantial effect on its mechanical strength, through the well-established Hall-Petch relationship. In the past decade or so, there has been a resurgence of interest in this topic resulting from the ability to create metals with …

Introduction of MEMS Activity at Nano/Micro System Engineering Lab., Kyoto University

15 Sep 2007 | Online Presentations | Contributor(s): Osamu Tabata

We are aiming at the realization of microsystems and nanosystems with novel and unique functions by integrating functional elements in different domains such as mechanics, electronics, chemistry, optics and biotechnology. These micro/nano systems are expected to be novel machines, which will …

Nanotechnology: Considerations for Facility Design

21 May 2007 | Online Presentations | Contributor(s): John Weaver

The growing area of study broadly termed nanotechnology provides a new set of challenges to the facility designer. While evolutionary changes in the quality of clean spaces occur, it is the collaborative nature of this field that requires revolutionary changes in facility design. The …

Surface Characterization Studies of Carbon Materials: SS-DNA, SWCNT, Graphene, HOPG

16 Feb 2010 | Online Presentations | Contributor(s): Dmitry Zemlyanov

In this presentation examples of surface characterization studies of carbon specimens will be presented. (1) In particularly, the systematic XPS (X-ray photoelectron spectroscopy) characterization of graphene grown on the SiC surface will be reported. This work demonstrates a use for XPS to …

Finite Size Scaling and Quantum Criticality

09 May 2007 | Online Presentations | Contributor(s): Sabre Kais

The study of quantum phase transitions, which are driven by quantum fluctuations as a consequence of Heisenberg's uncertainty principle, continues to be of increasing interest in the fields of condensed matter and atomic and molecular physics. In this field we have established an …

Electric and Magnetic Properties of Multiferroic Oxide Thin Films and Heterostructures

20 Oct 2010 | Online Presentations | Contributor(s): Pedro Antonio Prieto

Outline: Introduction Preparation methods for oxide thin films Oxide thin films and heterostructures Multiferroic materials BiFeO3, YMnO3, BiMnO3 thin films and FE/FM Composites Conclusions Professor Pedro Prieto is the Director of the Excellence Center for Novel Materials in Colombia, …

Nanotechnology Activities in Colombia: A Perspective From the Excellence Center for Novel Materials

11 Oct 2010 | Online Presentations | Contributor(s): Pedro Antonio Prieto

I will present the current state of R & D in the fields of condensed matter, novel materials, and nanotechnology in Colombia. I will initially consider Latin America and the Caribbean (LAC) to then visualize individual developments, as well as those for the region as a whole in these fields of …

Transformative Power Semiconductor Technologies to Impact 21st Century Energy Economy, and Space and Defense Electronics

22 Sep 2010 | Online Presentations | Contributor(s): Krishna Shenai

This talk will focus on advanced power semiconductor materials, devices, circuits and systems that are needed in order to address this daunting challenge. Specifically we will discuss emerging silicon and wide bandgap materials and power devices, heterogeneous chip-scale power integration, advanced …

TiCN/TiNbCN Multilayer System with Enhanced Tribological Properties

20 Oct 2010 | Online Presentations | Contributor(s): Pedro Antonio Prieto

Improvement in the mechanical properties of hard coatings such monolayer (TiN, CrN, AlCN, WC-Co, TiCN) [1], has been achieved using compositional gradient WC/C layer, or multilayered type [transition metal/transition carbide]n, [transition metal/transition nitride]n, [TiCN/ZrCN]n, among others. …

Control of Spin Precession in a Datta-Das Transistor Structure

11 Apr 2011 | Online Presentations | Contributor(s): Hyun Cheol Koo

Transistors Switch onto Spin Using the spin of an electron in addition to, or instead of, the charge properties is believed to have many benefits in terms of speed, power-cost, and integration density over conventional electronic circuits. At the heart of the field of spintronics has been a …

The Elusive Spin Transistor

11 Apr 2011 | Online Presentations | Contributor(s): Supriyo Datta

This presentation is a short introductory tutorial on spin-transistors.