Maximal optical chirality via mode coupling in bilayer metasurfaces

2025/07/23 by Kumar, Brijesh, Toftul, Ivan, Kumar, Anshuman +2 · 3 citations
#FOS: Physical sciences #Optics (physics.optics)

paper · doi:10.48550/arxiv.2507.17428

Abstract

Recent advances in the physics of resonant optical metasurfaces allowed to realize the so-called maximum chirality of planar structures by engineering their geometric parameters. Here we employ bilayer membrane metasurfaces with a square lattice of rotated C₄-symmetric holes and uncover very different scenarios of chirality maximization by virtue of strong coupling of photonic eigenmodes of the membranes supplemented by smart engineering of dissipation losses. Our findings substantially expand the class of planar maximally chiral resonant surfaces feasible for widespread nanolithography techniques desired for metaphotonic applications in chiral sensing, chiral light emission, detection and polarization conversion.

Citations

• Monoclinic nonlinear metasurfaces for resonant engineering of polarization states
• Chirality encoding in resonant metasurfaces governed by lattice symmetries
• Single-handedness chiral optical cavities
• Polarization state of radiation from a photonic crystal slab

Cited by

• Optical chirality of membrane metasurfaces with broken in-plane symmetry
• Strong Mode Coupling and Maximum Directional Absorption in Reciprocal Bianisotropic Metasurfaces
• Nonlinear chiral response from linearly achiral membrane metasurfaces

Related

• Optical chirality of membrane metasurfaces with broken in-plane symmetry
• Maximum chirality in planar metasurfaces induced by strong coupling of quasi-bound states in the continuum
• Nonlinear chiral response from linearly achiral membrane metasurfaces
• Chirality encoding in resonant metasurfaces governed by lattice symmetries
• Optical Control of Chirality by Ultrafast Symmetry Breaking in Membrane Metasurfaces