Highly Efficient Anisotropic Chiral Plasmonic Metamaterials for Polarization Conversion and Detection

Jing Bai, Yu Yao

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Plasmonic chiral metamaterials have attracted broad research interest because of their potential applications in optical communication, biomedical diagnosis, polarization imaging, and circular dichroism spectroscopy. However, optical losses in plasmonic structures severely limit practical applications. Here, we present the design concept and experimental demonstration for highly efficient subwavelength-thick plasmonic chiral metamaterials with strong chirality. The proposed designs utilize plasmonic metasurfaces to control the phase and polarization of light and exploit anisotropic thin-film interference effects to enhance optical chirality while minimizing optical loss. Based on such design concepts, we demonstrated experimentally optical devices such as circular polarization filters with transmission efficiency up to 90% and extinction ratio >180, polarization converters with conversion efficiency up to 90%, as well as on-chip integrated microfilter arrays for full Stokes polarization detection with high accuracy over a broad wavelength range (3.5-5 μm). The proposed design concepts are applicable from near-infrared to Terahertz regionsviastructural engineering.

Original languageEnglish (US)
Pages (from-to)14263-14274
Number of pages12
JournalACS nano
Volume15
Issue number9
DOIs
StatePublished - Sep 28 2021

Keywords

  • Stokes parameters
  • chiral metamaterials
  • highly efficient
  • mid-infrared
  • plasmonic metasurfaces
  • polarization conversion
  • polarization detection

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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