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    Article

    Achiral, Helicity Preserving, and Resonant Structures for Enhanced Sensing of Chiral Molecules
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    • Florian Graf*
      Florian Graf
      Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
      *E-mail: [email protected]
      More by Florian Graf
    • Joshua Feis
      Joshua Feis
      Institute of Applied Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
      More by Joshua Feis
    • Xavier Garcia-Santiago
      Xavier Garcia-Santiago
      Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
      JCMWave GmbH, 14050 Berlin, Germany
      More by Xavier Garcia-Santiago
    • Martin Wegener
      Martin Wegener
      Institute of Applied Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
      Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
      More by Martin Wegener
    • Carsten Rockstuhl
      Carsten Rockstuhl
      Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
      Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
      More by Carsten Rockstuhl
    • Ivan Fernandez-Corbaton*
      Ivan Fernandez-Corbaton
      Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
      *E-mail: [email protected]
      More by Ivan Fernandez-Corbaton
      Orcidhttp://orcid.org/0000-0003-2834-5572
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    ACS Photonics

    Cite this: ACS Photonics 2019, 6, 2, 482–491
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    https://doi.org/10.1021/acsphotonics.8b01454
    Published January 28, 2019
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    Abstract

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    We derive a set of design requirements that lead to structures suitable for molecular circular dichroism (CD) enhancement. Achirality of the structure and two suitably selected sequentially incident beams of opposite helicity ensures that the CD signal only depends on the chiral absorption properties of the molecules, and not on the achiral ones. Under this condition, a helicity preserving structure, which prevents the coupling of the two polarization handednesses, maximizes the enhancement of the CD signal for a given ability of the structure to enhance the field. When the achirality and helicity preservation requirements are met, the enhancement of the CD signal is directly related to the enhancement of the field. Next, we design an exemplary structure following the requirements. The considered system is a planar array of silicon cylinders under normally incident plane-wave illumination. Full-wave numerical calculations show that the enhancement of the transmission CD signal is between 6.5 and 3.75 for interaction lengths between 1.25 and 3 times the height of the cylinders.

    Copyright © 2019 American Chemical Society

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsphotonics.8b01454.

    • S1: Derivation of design requirements for CD enhancing structures. S2: Implementation of chiral constitutive relations. S3: Influence of the discretization mesh (PDF).

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    Cite this: ACS Photonics 2019, 6, 2, 482–491
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    https://doi.org/10.1021/acsphotonics.8b01454
    Published January 28, 2019
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