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Related Concept Videos

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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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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.
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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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The Ideal Diode01:15

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A diode is a semiconductor device that allows current to flow in one direction only, making it a crucial component in electronic circuits for controlling the direction of current flow. An ideal diode is a simplified version of a real diode used to understand how diodes work in circuits. It possesses two terminals: the positive anode and the cathode, which is negative. When a positive voltage is applied to the anode relative to the cathode, the diode is in a forward-biased state, allowing...
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Schottky Barrier Diode01:27

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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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Updated: May 14, 2025

Niobium Oxide Films Deposited by Reactive Sputtering: Effect of Oxygen Flow Rate
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Visible light thermo-optic switches using an Nb2O5 waveguide.

Genkei Tei, Yuto Shinbo, Yisheng Ni

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    Summary
    This summary is machine-generated.

    Niobium pentoxide (Nb2O5) shows promise for miniaturizing visible-light devices. This study details its use in waveguides and thermo-optic switches, achieving a 6.5 dB extinction ratio and 77 μs response time.

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    Area of Science:

    • Photonics and Materials Science
    • Optoelectronics and Waveguide Technology

    Background:

    • Visible-light devices require materials with high refractive indices for efficient light manipulation.
    • Niobium pentoxide (Nb2O5) possesses a high refractive index in the visible spectrum, making it a potential candidate for optoelectronic applications.

    Purpose of the Study:

    • To fabricate and demonstrate visible-light waveguides and thermo-optic switches using Nb2O5.
    • To investigate the material properties and switching performance of Nb2O5 for optoelectronic applications.

    Main Methods:

    • Fabrication of visible-light waveguides and thermo-optic switches using Nb2O5.
    • Characterization of Nb2O5 material properties, including its thermo-optic coefficient.
    • Evaluation of the switching performance of the fabricated devices, measuring extinction ratio and response time.

    Main Results:

    • The thermo-optic coefficient of Nb2O5 was determined to be 2.27 × 10^-5 K^-1.
    • The fabricated Nb2O5 thermo-optic switch achieved an extinction ratio of 6.5 dB.
    • The switch demonstrated a response time of 77 μs.

    Conclusions:

    • Nb2O5 is a viable material for fabricating visible-light waveguides and thermo-optic switches.
    • The demonstrated performance indicates Nb2O5's potential for miniaturizing visible-light optoelectronic devices.
    • Further research into Nb2O5 could lead to advancements in compact photonic integrated circuits.