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Related Concept Videos

Faraday's Law01:10

Faraday's Law

Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the direction in...
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Wavelength independent Faraday isolator.

P A Schulz

    Applied Optics
    |June 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel wavelength independent Faraday isolator was developed using an optically active rotator. This device achieves over 30 dB isolation and 80% transmission across a broad spectral range.

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    A Multimodal Wide-Field Fourier-Transform Raman Microscope
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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Faraday rotators are crucial optical components for isolating light.
    • Chromatic dispersion in traditional Faraday rotators limits their performance over broad wavelength ranges.

    Purpose of the Study:

    • To design and demonstrate a wavelength independent Faraday isolator.
    • To overcome the limitations of dispersion in conventional Faraday rotators.

    Main Methods:

    • Incorporation of an optically active rotator to counteract the dispersion of a 45-degree Faraday rotator.
    • Experimental characterization of isolation and forward transmission across the 735-870 nm spectral range.

    Main Results:

    • Achieved isolation exceeding 30 dB within the 735-870 nm wavelength range.
    • Demonstrated forward transmission greater than 80% over the same spectral band.
    • Analyzed the impact of dispersion, temperature, and angular tolerance on device performance.

    Conclusions:

    • The developed Faraday isolator exhibits robust performance across a wide spectrum.
    • The use of an optically active rotator effectively compensates for dispersion, enabling wavelength independence.
    • The device shows potential for applications requiring broadband optical isolation.