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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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    Area of Science:

    • Plasmonics
    • Metasurfaces
    • Chirality

    Background:

    • Chiral plasmonic metasurfaces offer unique optical properties.
    • Achieving strong circular dichroism (CD) in absorption is crucial for advanced applications.
    • Existing methods for designing chiral metasurfaces can be complex and limited.

    Purpose of the Study:

    • To design binary-pattern chiral plasmonic metasurfaces with strong circular dichroism in the near-infrared (NIR) range.
    • To investigate the impact of geometric parameters on CD performance.
    • To establish a universal design methodology for tailored chiral metasurface properties.

    Main Methods:

    • Utilized a micro-genetic algorithm for optimizing binary-pattern chiral plasmonic metasurfaces.
    • Studied the influence of geometric parameter modifications on nanostructures.
    • Analyzed the underlying physics involving resonant mode excitation and interference.

    Main Results:

    • Achieved strong circular dichroism in absorption within the NIR wavelength range.
    • Demonstrated the tunability of CD performance through geometric parameter control.
    • Identified simultaneous excitation and field interference of resonant modes as the mechanism for strong CD.

    Conclusions:

    • Developed an efficient design method for chiral plasmonic metasurfaces using micro-genetic algorithms.
    • The proposed method allows for on-demand tailoring of metasurface properties.
    • This work facilitates future applications in chiral sensing, imaging, and spectroscopy.