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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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...
MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Magnetooptic bounce-cavity modulator.

K Y Lau, J C Campbell, J Stone

    Applied Optics
    |March 10, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel magneto-optic modulator using a bounce-cavity design. This device achieves direct amplitude modulation via the Faraday effect and differential mirror reflectivity for polarized light.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Magneto-optic modulators are crucial for optical signal processing.
    • Existing modulators often have limitations in modulation speed or efficiency.

    Purpose of the Study:

    • To introduce a new magneto-optic modulator with a bounce-cavity structure.
    • To demonstrate direct amplitude modulation using the Faraday effect and differential reflectivity.

    Main Methods:

    • Utilized the Faraday effect for polarization rotation.
    • Employed dielectric mirrors with differential reflectivity for transverse magnetic (TM) and transverse electric (TE) polarizations.
    • Analyzed transmission based on reflection count, mirror reflectivity, and phase shift differences.

    Main Results:

    • Successfully demonstrated direct amplitude modulation.
    • Transmission characteristics were correlated with design parameters (reflections, reflectivity, phase shift).
    • A preliminary device fabricated from Yttrium Iron Garnet (YIG) showed operational capability.

    Conclusions:

    • The bounce-cavity magneto-optic modulator offers a viable method for direct amplitude modulation.
    • The design leverages fundamental optical principles for efficient modulation.
    • YIG is a suitable material for fabricating such devices.