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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

403
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
403

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Related Experiment Video

Updated: Jul 1, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Multipath-controlled bidirectional metasurface for multitasking polarization regulation and absorption.

Jiayun Wang, Yuanyuan Niu, Jinfeng Kang

    Optics Express
    |March 5, 2024
    PubMed
    Summary

    This study introduces a multipath-controlled bidirectional metasurface (MCBM) for terahertz (THz) applications. The MCBM integrates polarization control, perfect absorption, and total reflection, switchable via excitation conditions and multipath controls.

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    Area of Science:

    • Metasurfaces
    • Terahertz (THz) technology
    • Electromagnetics

    Background:

    • Designing single unit cells for multiple metasurface functions is challenging.
    • Integrating polarization regulation, perfect absorption, and total reflection in one device is complex.

    Purpose of the Study:

    • To design a multipath-controlled bidirectional metasurface (MCBM) for integrated multitasking functions in the THz band.
    • To demonstrate the MCBM's ability to perform polarization conversion, perfect absorption, and total reflection under varying conditions.

    Main Methods:

    • Design and simulation of a novel bidirectional metasurface structure.
    • Analysis of metasurface performance under different co-planar polarized THz wave incidence conditions (normal and back-side).
    • Investigation of multipath control mechanisms (temperature, voltage, polarization status) for function switching and regulation.

    Main Results:

    • The MCBM successfully converts co-planar to cross-polarization and circular polarization in reflection and transmission modes.
    • Under back-side incidence, the MCBM achieves broadband perfect absorption, total reflection, and co-planar to cross-polarization conversion.
    • All operating frequency bands for these tasks are closely aligned.
    • Multitasking functions are switchable by altering excitation conditions and controllable via temperature, voltage, and polarization status.

    Conclusions:

    • The developed MCBM offers an effective strategy for multipath-controlled multitasking integrated devices in the THz range.
    • This design advances the integration capabilities of metasurfaces for diverse THz applications.