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Related Concept Videos

Biasing of P-N Junction01:16

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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.
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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Related Experiment Video

Updated: Jun 20, 2026

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
05:57

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

Published on: April 1, 2020

All-optical phase- and power-controlled switching in nonlinear waveguide junctions.

Y Silberberg, B G Sfez

    Optics Letters
    |September 12, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A new all-optical waveguide switch uses nonlinear effects in a symmetric junction to route signals. This device enables efficient, controlled switching using minimal power or phase adjustments.

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    Area of Science:

    • Photonics and Optical Engineering
    • Nonlinear Optics
    • Integrated Optics

    Background:

    • Traditional optical switches often require complex fabrication and external control mechanisms.
    • The development of compact, efficient all-optical switching elements is crucial for advanced optical networks.
    • Nonlinear optical phenomena offer pathways to all-optical signal manipulation.

    Purpose of the Study:

    • To propose and investigate a novel all-optical waveguide switching element.
    • To demonstrate signal routing in a nonlinear symmetric junction.
    • To explore power- and phase-controlled switching capabilities with weak control signals.

    Main Methods:

    • Theoretical study of a nonlinear symmetric waveguide junction.
    • Analysis of how nonlinear refractive index changes affect signal propagation.
    • Simulation of signal routing to distinct output ports based on control parameters.

    Main Results:

    • A novel all-optical waveguide switch based on a nonlinear symmetric junction was proposed.
    • Nonlinear index changes were shown to break structural symmetry, enabling signal routing.
    • Successful demonstration of power- and phase-controlled switching using a weak control signal.

    Conclusions:

    • The proposed device offers a robust all-optical switching solution.
    • Switching performance is insensitive to precise control parameter values and structural variations.
    • This technology holds potential for compact and efficient optical routing applications.