Abstract
The development of a miniaturised device that provides efficient beam manipulation with high transmittance is extremely desirable for the broad range of applications including holography, metalens, and imaging. Recently, the potential of dielectric metasurfaces has been unleashed to efficiently manipulate the beam with full 2π-phase control by overlapping the electric and magnetic dipole resonances. However, in the visible range for available materials, it comes with the price of higher absorption that reduces efficiency. Here, we have considered dielectric amorphous silicon (a-Si) nanodisk and engineered them in such a way which provides minimal absorption loss in the visible range. We have experimentally demonstrated meta-deflector with high transmittance which operates in the visible wavelengths. The supercell of proposed meta-deflector consists of 15 amorphous silicon nanodisks numerically shows the transmission efficiency of 95% and deflection efficiency of 95% at operating wavelength of 715 nm. However, experimentally measured transmission and deflection efficiencies are 83% and 71%, respectively, having the experimental deflection angle of 8.40°. Nevertheless, by reducing the supercell length, the deflection angle can be controlled, and the value 15.50° was experimentally achieved using eight disks supercell. Our results suggest a new way to realise the highly transmittance metadevice with full 2π-phase control operating with the visible light which could be applicable in the imaging, metalens, holography, and display applications.
Highlights
In this paper, we concentrate on Mie-resonance Huygens’ dielectric metasurfaces that take place by overlapping electric dipole (ED) and magnetic dipole (MD) resonances
Utilising properties of near-unity transmittance and discrete phase of dielectric nanodisks, we have demonstrated that the transmitted beam angle can be varied significantly by controlling the supercell length
The strong resonance occurs around the disk diameter 200 nm, where the MD and EQ are excited
Summary
We concentrate on Mie-resonance Huygens’ dielectric metasurfaces that take place by overlapping electric dipole (ED) and magnetic dipole (MD) resonances Such metasurfaces can overcome the absorption loss of the materials leading to a full 2π-phase response with near-unity transmission[15,16]. Zhou et al reported the implementation of crystalline-silicon based dielectric metasurface with the experimental beam deflection of 19.27° and transmission efficiency of 67% at 532 nm wavelength[18]. Chalcogenide alloy PbTeLi based high-efficiency transmittance metasurfaces was reported with the experimental transmission efficiency of 75% and a deflection angle of 15.1° at mid-infrared wavelengths[22]. We have designed and fabricated a silicon metasurface that exhibits an efficient beam deflection capability and a high transmission property utilising the phase control. We have introduced a way to combine the waves coming from two different supercells that leads to excitation of high diffraction orders
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