Bulletin of the American Physical Society
81st Annual Meeting of the APS Southeastern Section
Volume 59, Number 18
Wednesday–Saturday, November 12–15, 2014; Columbia, South Carolina
Session JB: Nanotechnology |
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Chair: Richard Haglund, Vanderbilt University Room: Lexington |
Friday, November 14, 2014 2:00PM - 2:36PM |
JB.00001: TBD Invited Speaker: Jennider Andrew |
Friday, November 14, 2014 2:36PM - 3:12PM |
JB.00002: Real Space Imaging of Structurally and Compositionally Complex Materials Invited Speaker: Thomas Vogt High-Angle-Annular Dark-Field Scanning Transmission Electron Microscopy (HAADF/STEM) is a technique uniquely suited for detailed studies of the structure and composition of complex materials and allows us to speed up structural investigations in comparison to powder diffraction. The Mo-V-Nb-(Sb,Te)-O system has been identified as a commercially viable catalysts for the selective oxidation and ammoxidation of small alkanes to make about 25% of important organic chemicals and intermediates used in industry. The difficulty plaguing conventional crystallographic refinements of such a complex material is that the model has up to ~200 crystallographic parameters, requiring very high quality data and suitable starting models with imposed bond distance and angle constraints to reduce parameter space and ensure a stable and converging refinement. The availability of aberration-corrected electron microscopes has transforming imaging at the nanometer scale. Recent work also significan tly advanced the complexity of “frozen-phonon” calculations now possible to simulate HAADF-STEM images using massively parallel computations. In-situ heating in a STEM has revealed very unique thermal behavior and imaging at various temperatures helps us understand the operation of these catalysts near operando conditions . [Preview Abstract] |
Friday, November 14, 2014 3:12PM - 3:48PM |
JB.00003: Polarization-selective plasmon nanomodulator based on a phase change Invited Speaker: Kannatassen Appavoo Manipulating optical signals at length scales below the diffraction limit is crucial for next- generation data-storage and telecommunication technologies. Although guiding light around sharply-bent waveguides of appropriately small dimensions was achieved a decade ago, modulating optical signals at terahertz frequencies in nanoscale volumes remains a challenge. Since the physics underlying any modulator relies on changes in dielectric properties, modulators based on strongly electron-correlated materials (SECMs) are attractive because they exhibit orders of magnitude changes in electrical and optical properties with modest thermal, electrical or optical triggers. Here we demonstrate a hybrid nanomodulator of deep sub-wavelength dimensions by spatially confining light on the nanometer scale using a plasmonic gold nanodisk while simultaneously controlling the reactive near-field environment at its optical focus with a single, precisely positioned SECM nanostructure, a vanadium dioxide nanodisk. Since the functionality of the nanomodulator hinges on the near-field electromagnetic interaction between the two nanodisks, the modulation is polarization-selective; moreover, the energy costs per unit switching contrast are extremely low. This architecture suggests shows that reconfigurable optoelectronic building blocks can be tailored with exquisite precision by varying size, geometry, and the intrinsic materials properties of the hybrid elements. [Preview Abstract] |
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