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. 2020 Feb 28;2020:7873581.
doi: 10.34133/2020/7873581. eCollection 2020.

Chirality Enhancement Using Fabry-Pérot-Like Cavity

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Free PMC article

Chirality Enhancement Using Fabry-Pérot-Like Cavity

Jiaxin Bao et al. Research (Wash D C). .
Free PMC article

Abstract

Chiral molecules that do not superimpose on their mirror images are the foundation of all life forms on earth. Chiral molecules exhibit chiroptical responses, i.e., they have different electromagnetic responses to light of different circular polarizations. However, chiroptical responses in natural materials, such as circular dichroism and optical rotation dispersion, are intrinsically small because the size of a chiral molecule is significantly shorter than the wavelength of electromagnetic wave. Conventional technology for enhancing chiroptical signal entails demanding requirements on precise alignment of the chiral molecules to certain nanostructures, which however only leads to a limited performance. Herein, we show a new approach towards enhancement of chiroptical effects through a Fabry-Pérot (FP) cavity formed by two handedness-preserving metamirrors operating in the GHz region. We experimentally show that the FP cavity resonator can enhance the optical activity of the chiral molecule by an order of magnitude. Our approach may pave the way towards state-of-the-art chiral sensing applications.

Conflict of interest statement

The authors declare that they have no conflict of interest.

Figures

Figure 1
Figure 1
Design schematics of the (a) pure chiral molecule, (b) chiral molecule placed inside a FP cavity formed by two metamirrors, (c) chiral metamolecule, and (d) metamirror, wherein the geometrical parameters of the structures are indicated. Each Cu grating has a length of 5.4 mm, a width of 1.8 mm, a height of 0.035 mm, and a pitch of 6 mm. The height of the Cu mesh plane is 0.035 mm. The F4B boards have a thickness of 1.5 mm. Note, in the experiment, we measure an array of chiral structures instead of a single one.
Figure 2
Figure 2
The photographs of the fabricated (a) pure chiral metamolecules and (b) FP cavity configuration structures. (c) Experimental setup in a microwave anechoic chamber for the measurement of the fabricated structures. The inset shows the sample placed inside the compartment.
Figure 3
Figure 3
The CST-simulated linear transmission coefficients tyx, txy, txx, and tyy for (a) pure chiral metamolecule and (b) FP cavity configuration structures with θ1 = 45° and θ2 = 60°. The measured tyx, txy, txx and tyy for (c) pure chiral metamolecules and (d) FP cavity configuration structures with θ1 = 45° and θ2 = 60°.
Figure 4
Figure 4
(a, b) The CST-simulated rotation angle ϕ of (a) pure chiral metamolecule and (b) FP cavity configuration and (c, d) ellipticity η of (c) pure chiral metamolecule and (d) FP cavity configuration structures with θ1 = 45° and θ2 = 60°.
Figure 5
Figure 5
The theoretically calculated (a) linear transmission coefficients tyx, txy, txx, and tyy, (b) rotation angle ϕ, and (c) ellipticity η of the pure chiral medium (left column) and FP cavity embedded by the chiral medium (right column) structures. The rotation angle of the pure chiral medium is defined by ϕ = −1°.

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References

    1. Sekhon B. S. Chiral pesticides. Journal of Pesticide Science. 2009;34(1):1–12. doi: 10.1584/jpestics.R08-03. - DOI
    1. Anonymous. FDA'S policy statement for the development of new stereoisomeric drugs. Chirality. 1992;4(5):338–340. - PubMed
    1. Yoo S., Park Q. H. Chiral light-matter interaction in optical resonators. Physical Review Letters. 2015;114(20) doi: 10.1103/PhysRevLett.114.203003. - DOI - PubMed
    1. Tang Y., Cohen A. E. Optical chirality and its interaction with matter. Physical Review Letters. 2010;104(16) doi: 10.1103/PhysRevLett.104.163901. - DOI - PubMed
    1. Tang Y., Cohen A. E. Enhanced enantioselectivity in excitation of chiral molecules by superchiral light. Science. 2011;332(6027):333–336. doi: 10.1126/science.1202817. - DOI - PubMed

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