All-dielectric metamirror for independent and asymmetric wave-front control

Abstract

We report on the design and the numerical and experimental characterization of an all-dielectric reflecting focusing metasurface (metamirror) which does not have a back reflector, but effectively reflects incident waves with the desired reflection phase gradient. The profile of the reflection phase can be tuned independently for both sides of the single-layer subwavelength-thick metamirror by properly selecting dimensions of its dielectric inclusions. Such a feature stems from the bianisotropic omega properties of the inclusions. To demonstrate independent control of the reflection phase, we have designed a metamirror focusing normally incident plane waves at different focal distances being illuminated from the opposite sides. The proposed two-sided metamirror can find applications in antennas, diffraction gratings, and complex holograms. The absence of conducting elements makes it a perfect candidate for optical applications requiring asymmetric wave-front control.

Magnetic‐Electric Metamirror and Polarizing Beam Splitter Composed of Anisotropic Nanoparticles

“…Moreover, by providing fine-tuning of the mode interaction in dielectric nanoparticles, full control over the reflected wavefront can be achieved. [20,21] This ability to flexibly tune both reflection and transmission characteristics in dielectric metasurfaces opens the prospect of realizing polarization beam splitters and polarization converters with improved characteristics. [22][23][24][25][26] Optical anisotropy plays a crucial role in light manipulation in many optical systems owing to the birefringence phenomena.…”

All-dielectric Vogel metasurface antennas with bidirectional radiation pattern

“…In practice, such frequency-selective metamirrors can be realized in the form of periodic arrays of subwavelength metallic [16] or dielectric [17] particles. The known example of an all-dielectric frequency-selective metamirror is an array of asymmetrically perturbed dielectric disks [19].…”