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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Related Experiment Video

Updated: Mar 7, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Optical neutrality: invisibility without cloaking.

Reed Hodges, Cleon Dean, Maxim Durach

    Optics Letters
    |February 16, 2017
    PubMed
    Summary

    Researchers designed an invisible metamaterial object without cloaking. Increasing metal content transitions scattering properties, achieving optical neutrality through cancelled multiple scattering orders.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Metamaterials

    Background:

    • Metamaterials offer unique optical properties not found in natural materials.
    • The neutral inclusion concept and plasmonic cloaking have been previously explored for manipulating electromagnetic waves.

    Purpose of the Study:

    • To design a wavelength-sized metal-dielectric metamaterial object that exhibits invisibility.
    • To explore the transition of scattering properties in metamaterials by varying metal fraction.
    • To achieve optical neutrality without employing traditional cloaking techniques.

    Main Methods:

    • Extension of the neutral inclusion concept to Mie scatterers.
    • Systematic variation of the metal fraction within the metal-dielectric metamaterial.

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  • Analysis of scattering orders and their cancellation to understand optical behavior.

    • Main Results:

    • Demonstration of an invisible metamaterial object at the wavelength scale.
    • Observation of a transition from dielectric-like to metal-like scattering with increased metal fraction.
    • Achieved invisibility or optical neutrality through the cancellation of multiple scattering orders.

    Conclusions:

    • It is possible to design invisible metamaterial objects without cloaking.
    • The transition in scattering properties is a key mechanism for achieving optical neutrality.
    • This approach offers an alternative to conventional cloaking methods by manipulating scattering phenomena.