Giant chiro-optical responses in multipolar-resonances-based single-layer dielectric metasurfaces

HAFIZ SAAD KHALIQ, INKI KIM, AIMA ZAHID, JOOHOON KIM, TAEJUN LEE, TREVON BADLOE, YESEUL KIM, MUHAMMAD ZUBAIR, KASHIF RIAZ, MUHAMMAD QASIM MEHMOOD, JUNSUK RHO*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

Chiro-optical effects offer a wide range of potential applications in nanophotonics, such as advanced imaging and molecular sensing and separation. Flat single-layer metasurfaces composed of subwavelength meta-atoms have gained significant attention due to their exceptional characteristics in light-matter interactions. Although metasurface- based devices have manipulated electromagnetic waves, the compact on-chip realization of giant chiro-optical effects remains a challenge at optical frequencies. In this work, we experimentally and numerically demonstrate an all-dielectric metasurface to realize large chiro-optical effects in the visible regime. Notably, the proposed strategy of utilizing achiral nanofins instead of conventional chiral structures provides an extra degree of design freedom. The mutual coupling between carefully engineered nanofins produces constructive and destructive interference, leading to the asymmetric transmission of 70% and average circular dichroism exceeding 60%. We investigate the underlying mechanism behind the chiro-optical effects using the theory of multipolar decomposition. The proposed design mechanism maximizes the chiro-optical response through a single-layer metasurface with potential applications in high-efficiency integrated ultrathin polarization rotators and shapers, chiral polarizers for optical displays, chiral beam splitters, and chiral sensors.

Original languageEnglish (US)
Pages (from-to)1667-1674
Number of pages8
JournalPhotonics Research
Volume9
Issue number9
DOIs
StatePublished - Sep 1 2021

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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