New Frontiers in Terahertz Technology
13 May 2015 | Online Presentations | Contributor(s): Mona Jarrahi
In this talk, I will describe some of our recent results on developing fundamentally new terahertz electronic/optoelectronic components and imaging/spectrometry architectures to mitigate performance limitations of existing terahertz systems.
Addressing Societal-scale Challenges with Nanoscale Materials: Flexible, Impedance-sensing “Smart Bandages” Enable Early Detection of Pressure Wounds
20 Apr 2015 | Online Presentations | Contributor(s): Sarah Swisher
In this talk, I will introduce our work developing solution-processed materials for flexible electronics, with emphasis on how these materials will enable new applications. I will then focus on one example: our recent development of a “smart bandage” prototype for detecting and...
Spaser in Quantum Regime
12 Feb 2015 | Online Presentations | Contributor(s): Mark I Stockman
The spaser have been introduced theoretically and discovered experimentally. We briefly consider quantum theory and latest results on spaser as an ultrafast quantum generator and amplifier of nanoplasmonic fields, ultrabright nanolabel, and highly-efficient nanosensor. We present latest original...
Coupling of Electron Spin Dynamics and Nanomechanical Motion in Carbon Nanotubes
20 Nov 2014 | Online Presentations | Contributor(s): Mark Rudner
Due to their low masses and high stiffnesses, nanostructures made out of atomically-thin carbon- based materials such as graphene and carbon nanotubes (CNTs) feature high mechanical oscillation frequencies and large zero-point vibration amplitudes. These properties open many avenues for...
Impedance Spectroscopy Methods Applied to Thermoelectric Materials and Devices
19 Nov 2014 | Online Presentations | Contributor(s): Jorge García-Cañadas
Impedance spectroscopy is one of the most helpful techniques for the characterization of a wide range of devices (solar cells, supercapacitors, fuel cells, etc.). However, it is not extensively used in the thermoelectric field and most of existing work is mainly focused on determining the figure...
Insight into Time-Resolved Photoluminescence Measurements on Thin-film Solar Cells using Numerical Simulations
09 Oct 2014 | Online Presentations | Contributor(s): Ana Kanevce
Increased efficiency in thin-film solar cells requires higher degree of understanding of the recombination mechanisms, and separating the various types of recombination involved. Time resolved photoluminescence (TRPL) measurement is a contactless and quick measurement method, and therefore one...
Ongoing Transformation of Computational Nanophotonics
18 May 2014 | Online Presentations | Contributor(s): Alexander V. Kildishev
Computational nanophotonics is one of the central tools of the science of light and photonic device engineering. It plays a crucial role in enabling optical technologies ranging from bio-sensing to quantum information processing. Up to the present, a plethora of various methods and commercial...
Coherent Nonlinear Optics, Backward Waves and Negative Spatial Dispersion
16 May 2014 | Online Presentations | Contributor(s): Alexander K. Popov
Extraordinary frequency-converting nonlinear-optical propagation processes associated with backward electromagnetic and elastic waves are described. Particular realizations of negative spatial dispersion which enable such waves are investigated.
Active Nanophotonics: From Coherent Control of Quantum Emitters to Plasmonic Nanolasers
28 Apr 2014 | Online Presentations | Contributor(s): Ken Shih
Light-matter interaction at nanometer scale is emerging as one of the most exciting fields in nanoscience. In combination with the advanced materials synthesis technique to tailor novel low-dimensional electronic systems, new doors are open toward design and realization of nanophotonic devices...
11 Apr 2014 | Online Presentations | Contributor(s): Hui Cao
Most of the research in the field of photonics has focused on understanding and mitigating the effects of disorder which are often detrimental. For certain applications, however, intentionally introducing disorder can actually improve the device performance, e.g., in photovoltaics optical...
Optical Multi-Dimensional Coherent Spectroscopy of Semiconductor Nanostructures
08 Apr 2014 | Online Presentations | Contributor(s): Steven Cundiff
I will give an introduction to optical two-dimensional coherent spectroscopy and then present our use of it to study optical resonances in semiconductor nanostructures. In quantum wells, our results show that many-body effects dominate the light-matter interaction for excitons in semiconductors...
Engineered Defects in Wide Band-gap Semiconductors for Single-spin Sensing and Computation
26 Mar 2014 | Online Presentations | Contributor(s): Abram Falk
Using infrared light at near-telecom wavelengths, I will show that spin states in silicon carbide exhibit long quantum coherence times that persist up to room temperature. I will also discuss new strategies for generating coherent spin interactions at the nanoscale using defects in inequivalent...
High-Rate Processing and Advanced Emitter Structures for CIGS PV Module Manufacturing
11 Jul 2013 | Online Presentations | Contributor(s): B. J. Stanbery
Achieving both macroscopic homogeneity and nanoscale heterogeneity for non-stoichiometric multinary compounds is a critical challenge for the success of copper indium gallium selenide (CIGS) photovoltaic cells. Co-evaporation yields world record performance, but is also a high-temperature vacuum...
Design of Optoelectronically-active Polymers for Organic Photovoltaic Applications
08 Feb 2013 | Online Presentations | Contributor(s): Bryan W. Boudouris
Organic photovoltaic (OPV) devices are of great interest due to their promise of providing flexible, lightweight, and inexpensive alternatives to their currently-used inorganic counterparts. However, large-scale implementation of these modules has been hampered due to their relatively low power...
The Elusive Spin Transistor
11 Apr 2011 | Online Presentations | Contributor(s): Supriyo Datta
This presentation is a short introductory tutorial on spin-transistors.
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...
Electric and Magnetic Properties of Multiferroic Oxide Thin Films and Heterostructures
20 Oct 2010 | Online Presentations | Contributor(s): Pedro Antonio Prieto
Outline:IntroductionPreparation methods for oxide thin filmsOxide thin films and heterostructures Multiferroic materialsBiFeO3, YMnO3, BiMnO3 thin films and FE/FM CompositesConclusions
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) , 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....
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,...