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  • Letter
  • Open Access

Employing quasidegenerate optical modes for chiral sensing

S. F. Almousa1,2, T. Weiss3,4, and E. A. Muljarov1

  • 1School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, United Kingdom
  • 2Department of Physics and Astronomy, King Saud University, Riyadh 11451, Saudi Arabia
  • 34th Physics Institute and SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
  • 4Institute of Physics, University of Graz, and NAWI Graz, Universitätsplatz 5, 8010 Graz, Austria

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Phys. Rev. B 109, L041410 – Published 26 January, 2024

DOI: https://doi.org/10.1103/PhysRevB.109.L041410

Abstract

Chiral molecules cannot be superposed with their own mirror image. This yields two enantiomers of opposite handedness that are made out of the same building blocks, but interact differently with their environment. Hence, chiral sensing is of utmost importance for biology, chemistry, and life sciences. However, the impact of the handedness and chirality is very weak in most sensing schemes. Nevertheless, it has been demonstrated recently that chirality may result in strong coupling between resonant states with high quality factors. This is achieved by spectrally overlapping two quasibound states in the continuum in a periodic array of nanostructures. We demonstrate that this requires neither quasibound states in the continuum nor periodic arrays, which is exemplified for three achiral systems: a sphere with equal permittivity and permeability, a single core-shell structure, and a dielectric metasurface. For such achiral systems, we have shown previously that isolated resonant states exhibit a quadratic energy shift in the Pasteur parameter. However, for quasidegenerate states, we observe, using the rigorous resonant-state expansion and full-wave simulations, a linear energy shift and linear splitting in the presence of a chiral medium or molecule. Thus, the splitting is more sensitive to low concentrations of chiral molecules, which paves the way for novel chiral sensing schemes.

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Phys. Rev. B 109, L041410– Published 26 January, 2024
  • Received 14 September 2023
  • Revised 6 December 2023
  • Accepted 2 January 2024
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