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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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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.
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Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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...
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Schottky Barrier Diode01:27

Schottky Barrier Diode

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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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MOSFET Amplifiers

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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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Related Experiment Video

Updated: Jun 29, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Broadband 2 × 2 multimode-interference coupler on the silicon-nitride platform.

Xiheng Ai, Yang Zhang, Wei-Lun Hsu

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    Summary
    This summary is machine-generated.

    Researchers developed a sub-wavelength grating (SWG) multi-mode interference coupler (MMI) for silicon nitride photonics. This device achieves a 300nm bandwidth, significantly improving upon conventional designs.

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    Area of Science:

    • Photonics
    • Materials Science
    • Integrated Optics

    Background:

    • Silicon nitride (Si3N4) photonic integrated circuits (PICs) are crucial for various optical applications.
    • Conventional multi-mode interference (MMI) couplers often face limitations in bandwidth.
    • Sub-wavelength gratings (SWGs) offer potential for enhanced optical device performance.

    Purpose of the Study:

    • To design, optimize, and implement a sub-wavelength grating (SWG) multi-mode interference coupler (MMI) on a silicon nitride photonic integrated circuit (PIC) platform.
    • To extend the theoretical framework of SWG MMIs from silicon-on-insulator to silicon nitride platforms.
    • To achieve a significantly enhanced bandwidth compared to conventional MMI devices.

    Main Methods:

    • Theoretical extension of SWG MMI principles to the Si3N4/SiO2 platform.
    • Parameter optimization, starting with a non-paired SWG MMI design.
    • Transition to a paired SWG MMI design to reduce footprint and broaden bandwidth.
    • Implementation and characterization of the optimized SWG MMI on the silicon nitride PIC.

    Main Results:

    • The optimized SWG MMI demonstrates a 1 dB bandwidth of 300 nm for both insertion loss and power imbalance.
    • The paired SWG MMI design results in a smaller device footprint.
    • The developed SWG MMI significantly enhances the operational bandwidth on the silicon nitride platform.

    Conclusions:

    • The sub-wavelength grating multi-mode interference coupler is a viable and high-performance component for silicon nitride photonics.
    • The achieved 300 nm bandwidth represents a substantial advancement over conventional MMI couplers.
    • This work contributes to the development of broader bandwidth and more compact photonic integrated circuits.