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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Unidirectional reflectionless phenomenon in periodic ternary layered material.

Erchan Yang, Yonghua Lu, Yong Wang

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    PubMed
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    Researchers demonstrate a unidirectional reflectionless phenomenon in periodic ternary layered materials (PTLM). This effect, achieved through asymmetric coupling in layered structures, allows for controlled light reflection, enabling novel optical device applications.

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    Area of Science:

    • Photonics and Metamaterials
    • Wave Propagation and Optics

    Background:

    • Periodic layered materials offer unique optical properties.
    • Controlling light reflection is crucial for optical device design.

    Purpose of the Study:

    • To investigate the unidirectional reflectionless phenomenon in periodic ternary layered materials (PTLM).
    • To establish the necessary and sufficient conditions for achieving this phenomenon.
    • To reveal the underlying physical mechanisms through numerical simulations.

    Main Methods:

    • Analysis using coupled mode theory.
    • Numerical simulations to explore physical mechanisms.
    • Modeling of PTLM with real dielectric and complex (loss/gain) layers.

    Main Results:

    • Demonstrated unidirectional reflectionless phenomenon in PTLM.
    • Presented a concise necessary and sufficient condition for the effect.
    • Showcased the ability to realize both unidirectional reflectionless and symmetric reflection phenomena by tuning parameters.

    Conclusions:

    • Periodic ternary layered materials can exhibit unidirectional reflectionless behavior.
    • Asymmetric coupling between forward and backward modes is key.
    • Tunable optical parameters allow for versatile control over reflection characteristics.