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A dynamically tunable planar multiplayer absorber is demonstrated using the VO2 phase-change material. As the VO2 phase transition is thermally triggered, a modulation depth of 72.6% is achieved over a broad wavelength range from 4–8.2μm.
An enhancement of graphene interband absorption by more than four-fold is demonstrated in a Salisbury screen configuration. For a monolayer graphene, peak absorptions between 9% and 40% are measured at different incident angles.
By using a metal-dielectric-metal layered geometry, infrared metasurfaces made of composite right-left handed transmission-line are demonstrated. Both of their right and left handed modes are measured with angle-variable reflection spectroscopy in the terahertz and mid-infrared regions. The demonstrated metasurface lays a foundation for a variety of devices for advanced thermal sensing and camouflaging.
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