High-contrast and reversible scattering switching via hybrid metal-dielectric metasurfaces

Beilstein Journal of Nanotechnology

Lei Xu¹  Andrey E. Miroshnichenko¹  Mohsen Rahmani¹  Jonathan Ward¹  Khosro Zangeneh Kamali¹  Guoquan Zhang² 

[1]Nonlinear Physics Centre, Australian National University, Canberra ACT 2601, Australia

[2]The MOE Key Laboratory of Weak Light Nonlinear Photonics, School of Physics and TEDA Applied Physics Institute, Nankai University, Tianjin 300457, China

关键词: dielectrics;    directionality;    metasurfaces;    Mie resonance;    plasmonics;    reversible tuning;   

DOI  :  10.3762/bjnano.9.44

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown