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Absorption of Radiation01:05

Absorption of Radiation

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Related Experiment Video

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Thermal and electrical switchable wide-angle multi-band terahertz absorber.

Rong Cheng, Yuxiu Zhou, Beirong Liang

    Optics Express
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    This study introduces a novel multi-band terahertz (THz) absorber switchable using both thermal and electrical methods. The device offers tunable absorption states and wide-angle performance, advancing THz technology for communication and imaging applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Multi-band terahertz (THz) absorbers are crucial for communication, imaging, and detection.
    • Existing absorbers often rely on single tuning methods, limiting their versatility.
    • A need exists for absorbers with dynamic, multi-modal tunability.

    Purpose of the Study:

    • To propose and demonstrate a novel multi-band THz absorber co-modulated by thermal and electrical methods.
    • To investigate the tunability of absorption peaks through varying vanadium dioxide (VO2) dimensions and dielectric layer thickness.
    • To explore the potential of multi-layer graphene nanoribbon structures for enhanced modulation capabilities.

    Main Methods:

    • Utilized vanadium dioxide (VO2) for thermal and electrical modulation of THz absorption.
    • Investigated Fabry-Pérot resonance and inductor-capacitor resonance modes for peak frequency and quality factor tuning.
    • Employed varying dielectric layer thickness and graphene nanoribbon Fermi energy for multi-state modulation.

    Main Results:

    • Achieved co-modulation of multi-band THz absorption using thermal and electrical stimuli.
    • Demonstrated dynamic switching between multiple absorption states (four or six) in stacked devices.
    • Confirmed wide-angle performance with minimal degradation up to 70° incident angle.

    Conclusions:

    • The proposed thermal-electrical switchable wide-angle multi-band THz absorber offers enhanced tunability and dynamic control.
    • This design provides a versatile platform for advanced THz applications.
    • The study serves as a reference for future high-performance THz absorber development.