High-Q Circular Dichroism Resonances in Plasmonic Lattices with Chiral Unit Cells

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yidong Hou
  • Meng Qiu
  • Zhaolong Cao
  • Jie Zhou
  • Hock Chun Ong
  • Wei Jin
  • Jinglei Du

Detail(s)

Original languageEnglish
Article number2204095
Journal / PublicationAdvanced Functional Materials
Volume32
Issue number40
Online published2 Aug 2022
Publication statusPublished - 5 Oct 2022

Abstract

Plasmonic chiral nanostructures have attracted a great deal of attention in chirality-based biosensing, enantioselective separation, and recently photonic orbital angular momentum-based quantum information processing. However, the intrinsic Ohmic losses of metals and significant radiative scattering of plasmonically resonant nanostructures result in small quality factors and hence weak optical chirality (such as circular dichroism, CD). Here, it is reported that propagating surface plasmon polaritons (SPPs)—an achiral electromagnetic surface wave—can significantly enhance the Q-factors of localized surface plasmon resonance (LSPR) related CD in plasmonic lattices with chiral unit cells. It is demonstrated experimentally and theoretically that mode interaction between the highly dispersive achiral SPPs and the nondispersive chiral LSPR results in the formation of hybrid chiral SPPs, enabling efficient tuning of the resultant transmission CD dispersion and signal intensity. A maximum CD signal of 0.8 is experimentally observed with a Q-factor of 45 in the visible spectral region, showing good agreement with theoretical calculations. This study provides an effective yet facile approach for engineering both the strength and dispersion of optical chirality, paving the way for realizing large-scale, low-cost, and high-performing chiral plasmonic and dielectric metasurfaces for a variety of sensing, imaging, and information manipulation.

Research Area(s)

  • chiral metasurfaces, circular dichroism, glancing angle deposition, gold nanohole arrays, surface plasmon polariton

Citation Format(s)

High-Q Circular Dichroism Resonances in Plasmonic Lattices with Chiral Unit Cells. / Hou, Yidong; Qiu, Meng; Cao, Zhaolong; Zhou, Jie; Ong, Hock Chun; Jin, Wei; Du, Jinglei; Lei, Dangyuan.

In: Advanced Functional Materials, Vol. 32, No. 40, 2204095, 05.10.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review