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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

555
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
555

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Related Experiment Video

Updated: Oct 2, 2025

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Graphene-based dual functional metadevice in the THz gap.

Sambit Kumar Ghosh, Santanu Das, Somak Bhattacharyya

    Applied Optics
    |February 24, 2022
    PubMed
    Summary

    This study introduces a graphene-metal dual functional metadevice for simultaneous terahertz (THz) absorption and cross-polarization conversion (CPC). This novel device offers tunable functionalities for advanced THz applications.

    Area of Science:

    • Metamaterials and Nanophotonics
    • Electromagnetics and Optics

    Background:

    • Terahertz (THz) technology requires advanced devices for wave manipulation.
    • Simultaneous control over absorption and polarization conversion is crucial for integrated THz systems.

    Purpose of the Study:

    • To propose and analyze a graphene-metal dual functional metadevice.
    • To demonstrate simultaneous THz absorption and cross-polarization conversion (CPC) functionalities.
    • To explore the tunability of these functions via electrical biasing.

    Main Methods:

    • Design of a meta-atom with stacked metallic split rings, zinc oxide (ZnO) layers, and a slotted graphene layer.
    • Electromagnetic wave interaction analysis in the THz regime.
    • Tunable performance evaluation under different static electric field biasing conditions.

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  • Validation through equivalent circuit analysis.

    • Main Results:

    • Achieved >70% absorptivity over a 3.40 THz bandwidth, peaking at 90% at 6.84 THz.
    • Demonstrated >90% cross-polarization conversion ratio (CPCR) over a 3.87 THz bandwidth.
    • Near-unity CPCR peaks observed at 2.38 THz, 3.80 THz, and 5.82 THz.
    • Device exhibits ultrathin (λ₀/12.49) and compact (λ₀/5) characteristics.

    Conclusions:

    • The proposed graphene-metal metadevice successfully integrates dual functionalities of absorption and CPC.
    • Tunable performance via electrical biasing enables versatile applications in the THz spectrum.
    • The compact and efficient design holds promise for THz sensing, communication, and stealth technologies.