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Field Effect Transistor01:29

Field Effect Transistor

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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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High performance metamaterials-high electron mobility transistors integrated terahertz modulator.

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    Area of Science:

    • Physics
    • Electrical Engineering
    • Materials Science

    Background:

    • Terahertz (THz) modulators are crucial for THz technology.
    • Existing modulators face challenges in speed and operating voltage.
    • Metamaterials offer unique electromagnetic properties for device design.

    Purpose of the Study:

    • To develop an electrically controlled THz modulator with enhanced performance.
    • To integrate metamaterials with high electron mobility transistors (HEMTs) for improved modulation.
    • To achieve high modulation depth and high switching speed at low operating voltages.

    Main Methods:

    • Fabrication of a THz modulator using symmetric quadruple-split-ring resonators (SRRs) metamaterial.
    • Integration of HEMTs to enable electric control and reduce operating voltage.
    • Characterization of modulation depth, phase shift, and switching speed at THz frequencies.

    Main Results:

    • Demonstrated an 80% modulation depth at 0.86 THz under a -4 V gate voltage.
    • Achieved a phase shift of 0.67 rad (38.4°) at 0.77 THz.
    • Obtained a modulation speed exceeding 2.7 MHz, with potential for hundreds of MHz.

    Conclusions:

    • The integrated metamaterial-HEMT THz modulator offers efficient electric control.
    • The device exhibits promising performance in modulation depth and speed.
    • Future optimization could lead to ultra-fast THz modulation for advanced applications.