Abstract
Novel types of optical hybrid metasurfaces consist of metallic and dielectric elements are designed and proposed for controlling the interference between magnetic and electric modes of the system, in a reversible manner. By employing the thermo-optical effect of silicon and gold nanoantennas we demonstrate an active control on the excitation and interference between electric and magnetic modes, and subsequently, the Kerker condition, as a directive radiation pattern with zero backscattering, via temperature control as a versatile tool. This control allows precise tuning optical properties of the system and stimulating switchable sharp spectral Fano-like resonance. Furthermore, it is shown that by adjusting the intermediate distance between metallic and dielectric elements, opposite scattering directionalities are achievable in an arbitrary wavelength. Interestingly, this effect is shown to have a direct influence on nonlinear properties, too, where 10-fold enhancement in the intensity of third harmonic light can be obtained for this system, via heating. This hybrid metasurface can find a wide range of applications in slow light, nonlinear optics and bio-chemical sensing.
Highlights
Metasurfaces are thin and flat surfaces that are created using subwavelength optical antennas with various optical properties patterned at interfaces [1,2], enabling control over the polarization, phase, amplitude, and dispersion of light
This metasurface is designed to stimulate a sharp interference between silicon and Recently, a new technique for reversible tuning of metasurfaces has been proposed, which is based on the thermo-optical coefficient of materials [36,37]
The tunability is achieved by the active control on the excitation and interference between the electric and magnetic resonances through heating the metasurface
Summary
Metasurfaces are thin and flat surfaces that are created using subwavelength optical antennas with various optical properties patterned at interfaces [1,2], enabling control over the polarization, phase, amplitude, and dispersion of light. The first generation of metasurfaces mostly consisted of plasmonic nanostructures [11,12,13], which utilize the interaction between light and metallic nanoparticles to generate surface plasmon resonances, inducing a strong electromagnetic field on the metallic surface They benefit from a large tunability and capability to significantly enhance the near-field intensity, and have remarkable advantages in controlling optical responses [14,15,16,17,18]. All-dielectric, high refractive index metasurfaces are the second generation of metasurfaces [19] Besides their CMOS compatibility and low optical losses compared with plasmonic metasurfaces, all-dielectric metasurfaces offer ability to efficiently manipulate light at the nanoscale based on the simultaneous control of electric and magnetic Mie resonances [19]. It has been shown that an overlap of the electric and magnetic dipole resonances can generate a relatively broad spectral band Kerker condition [20,23,24]
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