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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...
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Loss mechanisms in dielectric optical interference devices.

O Arnon

    Applied Optics
    |February 20, 2010
    PubMed
    Summary

    Residual absorption and scattering degrade optical device performance. This study introduces methods to quantify scattering losses in dielectric multilayers and proposes index inhomogeneity to reduce surface scattering, enhancing filter performance.

    Area of Science:

    • Optical Engineering
    • Materials Science

    Background:

    • Thin film optical devices suffer performance degradation due to residual absorption and scattering.
    • Understanding and mitigating these loss mechanisms are crucial for advancing optical technologies.

    Purpose of the Study:

    • To derive expressions for evaluating losses from surface and bulk scattering in dielectric multilayers.
    • To propose methods for improving the performance of basic optical filters.
    • To investigate the potential of index inhomogeneity in reducing surface scattering.

    Main Methods:

    • Derivation of scattering loss evaluation expressions by analogy to residual absorption.
    • Analysis of scattering phenomena in dielectric multilayer structures.
    • Modeling the impact of index inhomogeneity on surface scattering.

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    Main Results:

    • Expressions for quantifying surface and bulk scattering losses in dielectric multilayers were developed.
    • Proposals for enhancing the performance of traditional optical filters were presented.
    • Significant reduction in surface scattering is predicted through the implementation of index inhomogeneity.

    Conclusions:

    • The derived expressions provide a framework for analyzing scattering losses in optical thin films.
    • Index inhomogeneity presents a promising strategy for minimizing surface scattering and improving optical device performance.
    • Further research can explore the practical implementation of these findings in advanced optical filter designs.