Session B18: Focus Session: Nanostructures and Metamaterials, Growth, Structure, and Characterization -- Metamaterials with Gain and Active

11:15 AM–2:15 PM, Monday, February 27, 2012
Room: 252B

Sponsoring Unit: DMP
Chair: Nader Engheta, University of Pennsylvania

Abstract ID: BAPS.2012.MAR.B18.12

Abstract: B18.00012 : Reconfigurable Gradient Index using VO$_2$ Memory Metamaterials

1:51 PM–2:03 PM

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  Michael Goldflam
    (University of California San Diego)

  Tom Driscoll
    (UCSD and Duke University)

  Brian Chapler
    (University of California San Diego)

  Omar Khatib
    (University of California San Diego)

  Nan Jokerst
    (Duke University)

  Sabarni Palit
    (Duke University)

  David Smith
    (Duke University)

  Bong-Jun Kim

  Giwan Seo
    (University of Science and Technology)

  Hyun-Tak Kim
    (ETRI and UST in Korea)

  Massimiliano Di Ventra
    (University of California San Diego)

  Dimitri Basov
    (University of California San Diego)

We have demonstrated tuning of a metamaterial device that incorporates a form of spatial gradient control. Electrical tuning of the metamaterial was achieved through a vanadium dioxide layer which interacts with an array of split ring resonators. Through design of the device and contact geometry, we achieved a spatial gradient in the magnitude of permittivity, writeable using a single transient electrical pulse. This induced gradient in our device was observed on spatial scales on the order of one wavelength at 1 THz. Thus we have demonstrated the viability of elements for use in future devices with potential applications in beamforming and communications.\footnote{M. D. Goldflam, \textit{et. al.}, Appl. Phys. Lett. 99, 044103 (2011).} Various contact geometries are currently being investigated with the goal of implementing finer control over gradients and expanding on the possible applications of such devices.

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