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Related Concept Videos

Switching of BJT01:22

Switching of BJT

Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are reverse-biased. The...
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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 current...

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Quasi-light Storage for Optical Data Packets
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Non-volatile optical switch based on Sb2Se3-loaded three-mode interference.

Xinxin Zhao, Xiaolong Liu, Yujiao Tao

    Optics Letters
    |June 13, 2025
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel non-volatile optical switch using antimony selenide (Sb2Se3) in a waveguide. This device enables efficient light routing for advanced photonic processors and optical field-programmable gate arrays.

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    Area of Science:

    • Photonics and optical engineering
    • Materials science for optoelectronics
    • Non-volatile photonic devices

    Background:

    • Multimode interference (MMI) couplers are crucial for optical switching.
    • Controlling phase shifts in MMI devices is key for efficient light routing.
    • Non-volatile materials offer potential for reconfigurable photonic circuits.

    Purpose of the Study:

    • To propose and demonstrate a non-volatile optical switch.
    • To utilize multimode interference in an Sb2Se3-loaded waveguide for optical switching.
    • To achieve low-loss and compact optical switching with reconfigurable light routing.

    Main Methods:

    • Fabrication of an Sb2Se3-loaded waveguide.
    • Implementation of low-loss phase control within an MMI coupler.
    • Characterization of the optical switch performance in amorphous and crystalline states.

    Main Results:

    • Demonstrated a compact optical switch with a length of ~35 μm.
    • Achieved low insertion loss of ~1.5 dB.
    • Exhibited minimal crosstalk below -6 dB over a 35 nm bandwidth.

    Conclusions:

    • The Sb2Se3-loaded waveguide switch offers efficient, non-volatile light routing.
    • Phase transitions in Sb2Se3 enable reconfigurable optical signal paths.
    • This technology paves the way for optical field-programmable gate arrays and high-density photonic processors.