Bulletin of the American Physical Society
Spring 2010 Meeting of the Ohio Section of the APS
Volume 55, Number 4
Friday–Saturday, April 30–May 1 2010; Flint, Michigan
Session A1: Welcome Address and Invited Session I |
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Room: Academic Building McKinnon Theatre |
Friday, April 30, 2010 1:30PM - 1:45PM |
A1.00001: Welcome Address |
Friday, April 30, 2010 1:45PM - 2:45PM |
A1.00002: Negative Refraction and Radiationless Interference: The Quest for the Superlens Invited Speaker: The first part of the talk will take us from the late 1800's, when Abbe published his ground-breaking paper on the limit of resolution of an optical instrument, to the turn of the 20th century, when the field of near-field optics experienced a tremendous growth, emphasizing recent developments motivated by the work of Pendry on negative-index superlenses [1]. We will also discuss how Abbe's result is related to Heisenberg's uncertainty principle and how the diffraction limit can be bypassed without violating any physical law. In the second part of the talk, the concept of near-field plates (NFPs) will be introduced [2]. These are planar structures which rely on a hitherto unrecognized property of Maxwell's equations to provide focusing well beyond the diffraction limit, at arbitrary frequencies. The subwavelength electromagnetic-field distributions closely resemble those of slabs of negative-index material. The structures' design is related to that of the Fresnel plates in that diffraction forces the input field to converge to a spot on the focal plane. Unlike the conventional zone plates, the NFPs control the near field and, as such, their superlensing properties originate from a static form of interference. Practical implementations of these plates hold promise for near-field data storage, non-contact sensing, imaging, nanolithography and wireless power transfer applications. Experimental results on a microwave near-field plate will be presented, which demonstrate focusing of 1 GHz radiation at a resolution of $\lambda $/20 [3]. \\[4pt] [1] J. B. Pendry, \textit{Phys. Rev. Lett. }\textbf{85}, 3966 (2000) \\[0pt] [2] R. Merlin, \textit{Science} \textbf{317}, 927 (2007) \\[0pt] [3] A. Grbic, L. Jiang and R. Merlin, \textit{Science} \textbf{320}, 511 (2008). [Preview Abstract] |
Friday, April 30, 2010 2:45PM - 3:45PM |
A1.00003: High Temperature Superconductors: From Discovery to Applications Invited Speaker: Remember high-temperature superconductors? These high-tech darlings of the late 1980s brought a Nobel Prize to their discoverers and generated endless speculation about how their near perfect conduction of electricity would revolutionize the world we live in! Well, it hasn't happened - at least not yet. A key obstacle has been the difficulty of forming long, flexible wires which carry large amounts of supercurrents per unit area, from these brittle ceramic superconductors which essentially resemble ``mud.'' It turns out that from a technical or performance standpoint, a long, flexible, single-crystal-like wire of the highly brittle, ceramic superconductor is required. From a cost-and-fabrication standpoint, an industrially scalable, low-cost process is required{\ldots}with the goal being to meet or beat the price of copper wire! Both of these critical requirements are met by epitaxial deposition of superconductors on rolling-assisted-biaxially-textured-substrates (RABiTS). This technique employs simple, scalable, thermomechanical processing techniques to obtain a single-crystal-like, flexible, metal-based substrates in arbitrary lengths upon which epitaxial oxide buffer layers and superconductors are then deposited. Fundamental problems associated with the first generation superconducting wire technology leading to the present second generation wire technology will be discussed. Large-scale, bulk applications of high temperature superconductors are presently expected to be in billions of dollars by year 2020 and select applications will be discussed. This talk will take you on a journey from the discovery of high temperature superconductors towards realizing practical, large-scale, bulk applications of these novel materials. [Preview Abstract] |
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