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, David Shrekenhamer, Joseph A. Miragliotta, Joseph A. Miragliotta, Matthew Brinkley, Matthew Brinkley, Kebin Fan, Kebin Fan, Fenglin Peng, Fenglin Peng, John A. Montoya, John A. Montoya, Sebastian Gauza, Sebastian Gauza, Shin-Tson Wu, Shin-Tson Wu, Willie J. Padilla, Willie J. Padilla, } "Electronic and thermally tunable infrared metamaterial absorbers", Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 99180U (16 September 2016); doi: 10.1117/12.2238666; https://doi.org/10.1117/12.2238666

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