Abstract
A perfect bidirectional dynamic tunable absorber working in the near-infrared based on an asymmetric Fabry–Pérot resonance in a thin film dielectric–metal multilayer structure is proposed. Perfect narrowband absorption occurs at the wavelength of 1023 nm (full width at half-maximum, 13 nm) when light is normally incident on the surface covered with a silver film with a saturation voltage applied to polymer-dispersed liquid crystal (PDLC). Illumination from the opposite direction results in ultra-broadband absorption (98.91% absorption averaged over 764–2476 nm). The narrowband absorption can be dynamically tuned in the 1023–1056 nm range via PDLC modulation. Furthermore, the excellent angular sensitivity of the narrowband absorption, as well as the good angular and polarization tolerances of the broadband absorption are demonstrated.
Published Version
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