Abstract
Spectrometers, superprisms, and achromatic lenses are examples of structures where the dispersion property of electromagnetic waves is utilized. The traditional systems for dispersion engineering are rather heavy, bulky, and inflexible. This paper reports ultrathin metasurfaces with custom-tailored multi-resonances for broadband dispersion engineering, including negative, positive, zero, and hyper-negative dispersions. The designed elements have multiple degrees of freedom to excite and modulate the resonances, while ensuring a high efficiency. Within the operating bandwidth (8–12 µm), the average efficiency is approximately 60%. The dispersion engineering with a high efficiency may provide new functionalities to metasurfaces, not available in traditional diffraction or refraction devices.
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