Uniform Chirality Enhanced Optical Responses via Broadband Achiral Metasurfaces for Bio-Sensing Applications

Aqsa Asad, Hafiz Saad Khaliq, Aima Zahid, Muhammad Qasim Mehmood, Yehia Massoud*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Due to the recent advancement in metamaterials for bio-sensing applications, metasurfaces are designed to enhance the chirality of the incident CP light by creating chiral hotspots formed by the interaction of electric and magnetic fields. Most of the reported works focus on induced chirality in plasmonic structures operated by shifting the molecules' circular dichroism (CD) signal to plasmonic resonance frequencies, which results in a decrease in efficiency. Moreover, chiral structures like gammadions were also reported, which can enhance the chirality. Still, the inherent chirality of the structure is much larger than the chirality of the molecules and thus overshadows it. Therefore, highly efficient planar nanomaterials with broadband uniform chirality are needed to sort and detect natural and artificially-made chiral molecules. This work presents an aluminum-based dimer structure that confines the central gap's chiral field, leading to highly uniform volumetric chirality enhancement. The proposed achiral dimer structure enhances the chirality of the incident circularly polarized light without interfering with the circular dichroism (CD) of the molecules. As a result, we report high volumetric chirality and dissymmetry factor compared to the state-of-the-art, which is the figures of merit for CD spectroscopy and separation of enantiomers, respectively. This work can be applied to distinguish molecules with CD bands in the ultraviolet and visible wavelengths.

Original languageEnglish (US)
Title of host publicationNanophotonics, Micro/Nano Optics, and Plasmonics VIII
EditorsZhiping Zhou, Kazumi Wada, Limin Tong
PublisherSPIE
ISBN (Electronic)9781510657106
DOIs
StatePublished - 2022
EventNanophotonics, Micro/Nano Optics, and Plasmonics VIII 2022 - Virtual, Online, China
Duration: Dec 5 2022Dec 11 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume12322
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceNanophotonics, Micro/Nano Optics, and Plasmonics VIII 2022
Country/TerritoryChina
CityVirtual, Online
Period12/5/2212/11/22

Bibliographical note

Publisher Copyright:
© 2022 SPIE.

Keywords

  • Achiral Metasurfaces
  • Bio-Sensing Applications
  • Broadband
  • Chirality Enhancement
  • Ultraviolet-Visible

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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