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16 September 2016 Electronic and thermally tunable infrared metamaterial absorbers
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In this paper, we report a computational and experimental study using tunable infrared (IR) metamaterial absorbers (MMAs) to demonstrate frequency tunable (7%) and amplitude modulation (61%) designs. The dynamic tuning of each structure was achieved through the addition of an active material—liquid crystals (LC) or vanadium dioxide (VO2)--within the unit cell of the MMA architecture. In both systems, an applied stimulus (electric field or temperature) induced a dielectric change in the active material and subsequent variation in the absorption and reflection properties of the MMA in the mid- to long-wavelength region of the IR (MWIR and LWIR, respectively). These changes were observed to be reversible for both systems and dynamic in the LC-based structure.
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David Shrekenhamer, Joseph A. Miragliotta, Matthew Brinkley, Kebin Fan, Fenglin Peng, John A. Montoya, Sebastian Gauza, Shin-Tson Wu, and Willie J. Padilla "Electronic and thermally tunable infrared metamaterial absorbers", Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 99180U (16 September 2016);

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