Nonlinear circular dichroism in Mie-resonant nanoparticle dimers

Abstract

We study nonlinear response of a dimer composed of two identical Mie-resonant dielectric nanoparticles illuminated normally by a circularly polarized light. We develop a general theory describing hybridization of multipolar modes of the coupled nanoparticles, and reveal nonvanishing nonlinear circular dichroism (CD) in the second-harmonic generation (SHG) signal enhanced by the multipolar resonances in the dimer provided its axis is oriented under an angle to the crystalline lattice of the dielectric material. We present experimental results for this SHG-CD effect obtained for the AlGaAs dimers placed on an engineered substrate which confirm the basic prediction of our general multipolar hybridization theory.

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• Near-unity third-harmonic circular dichroism driven by quasi-BIC in asymmetric silicon metasurfaces
• Universal coupled theory for metamaterial Bound states in the continuum
• Nonlinear circular dichroism in Mie-resonant nanoparticle dimers
• Chiral Dichroism in Resonant Metasurfaces with Monoclinic Lattices
• Tuning nonlinear second-harmonic generation in AlGaAs nanoantennas via chalcogenide phase change material
• Nonlinearity-induced optical torque
• Scattering matrix for chiral harmonic generation and frequency mixing in nonlinear metasurfaces
• Fluorescence enhancement in topologically optimized gallium phosphide all-dielectric nanoantennas
• When does nonlinear circular dichroism appear in achiral dielectric nanoparticles?
• Multipole Born series approach to light scattering by Mie-resonant nanoparticle structures
• Light structuring via nonlinear total angular momentum addition with flat optics
• Achiral nanostructures: perturbative harmonic generation and dichroism under vortex and vector beams illumination