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Related Concept Videos

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Dielectric Polarization in a Capacitor01:31

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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...
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Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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Electrostatic Boundary Conditions in Dielectrics01:27

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Susceptibility, Permittivity and Dielectric Constant01:26

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When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
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Electric Dipoles and Dipole Moment01:30

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Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
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Related Experiment Video

Updated: Oct 26, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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All-dielectric perfect absorber based on quadrupole modes.

Rongyang Xu, Junichi Takahara

    Optics Letters
    |July 30, 2021
    PubMed
    Summary

    Researchers developed an all-dielectric perfect absorber using degenerate critical coupling of quadrupole modes. This overcomes the 50% absorbance limit for ultra-thin films, enabling new applications.

    Area of Science:

    • Photonics and Metamaterials
    • Optical Engineering
    • Materials Science

    Background:

    • Free-standing ultra-thin films are limited to 50% absorbance.
    • Existing perfect absorbers often rely on complex structures or lossy materials.

    Purpose of the Study:

    • To propose and investigate an all-dielectric perfect absorber overcoming the 50% absorbance limit.
    • To explore the application of degenerate critical coupling (DCC) to quadrupole modes for enhanced light absorption.

    Main Methods:

    • Theoretical study of light absorption in a dielectric elliptic cylinder.
    • Utilizing the concept of degenerate critical coupling (DCC) of electric and magnetic quadrupole modes.
    • Analyzing the spectral overlap of quadrupole resonance peaks.

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    Main Results:

    • Achieved perfect absorption (100%) in an all-dielectric structure.
    • Demonstrated that DCC can be extended to quadrupole modes, beyond dipole modes.
    • Identified spectrally overlapping electric and magnetic quadrupole modes as key to perfect absorption.

    Conclusions:

    • The proposed DCC method for quadrupole modes offers a pathway to ultra-thin perfect absorbers.
    • This all-dielectric perfect absorber design has potential applications in photodetectors, optical filters, and optical modulators.
    • The photothermal effect can mediate the functionality of these devices.