Nonlinear wavefront control by geometric-phase dielectric metasurfaces: Influence of mode field and rotational symmetry

Abstract

Nonlinear Pancharatnam-Berry phase metasurfaces facilitate the nontrivial phase modulation for frequency conversion processes by leveraging photon-spin dependent nonlinear geometric-phases. However, plasmonic metasurfaces show some severe limitation for nonlinear frequency conversion due to the intrinsic high ohmic loss and low damage threshold of plasmonic nanostructures. Here, we systematically study the nonlinear geometric-phases associated with the third-harmonic generation process occurring in all-dielectric metasurfaces, which are composed of silicon nanofins with different in-plane rotational symmetries. We find that the wave coupling among different field components of the resonant fundamental field gives rise to the appearance of different nonlinear geometric-phases of the generated third-harmonic signals. The experimental observations of the nonlinear beam steering and nonlinear holography realized in this work by all-dielectric geometric-phase metasurfaces are well explained with our developed theory. Our work offers a new physical picture to understand the nonlinear optical process occurring at nanoscale dielectric resonators and will help in the design of nonlinear metasurfaces with tailored phase properties.

References in corpus (6)

• Helicity Dependent Directional Surface Plasmon Polariton Excitation Using A Metasurface with Interfacial Phase Discontinuity
• Multipolar nonlinear nanophotonics
• Nonlinear Metamaterials for Holography
• Anapole-Assisted Strong Field Enhancement in Individual All-Dielectric Nanostructures
• Symmetry selective third harmonic generation from plasmonic metacrystals
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Cited by in corpus (6)

• Optical manipulation with metamaterial structures
• Minireview on Disordered Optical Metasurfaces
• Efficient generation of extreme terahertz harmonics in 3D Dirac semimetals
• Efficient frequency conversion with geometric phase control in optical metasurfaces
• Nonlinear dielectric geometric-phase metasurface with simultaneous structure and lattice symmetry design
• Tensor-driven geometric phase in nonlinear AlGaAs metasurfaces