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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David Shrekenhamer ; Joseph A. Miragliotta ; Matthew Brinkley ; Kebin Fan ; Fenglin Peng, et al.
Electronic and thermally tunable infrared metamaterial absorbers
", Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 99180U (September 16, 2016); doi:10.1117/12.2238666; http://dx.doi.org/10.1117/12.2238666