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Susceptibility, Permittivity and Dielectric Constant

Susceptibility, Permittivity and Dielectric Constant

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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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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Related Experiment Video

Updated: Jun 17, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

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Published on: July 18, 2015

Holographic dielectric grating: theory and practice.

M Chang, N George

|January 16, 2010

Summary

This study enhances the Raman-Nath formalism to analyze lossy dielectric gratings, revealing significant differences in diffracted beam computation compared to simpler models. The findings offer a more accurate understanding of grating efficiency under various loss and thickness conditions.

Area of Science:

Optics and Photonics
Materials Science

Background:

Dielectric gratings are crucial optical components.
Existing models often simplify lossy grating analysis.
Accurate modeling is needed for practical applications.

Purpose of the Study:

To develop and validate an enhanced Raman-Nath formalism for lossy dielectric gratings.
To investigate the impact of losses and thickness on grating efficiency.
To compare theoretical predictions with experimental data for bleached gratings.

Main Methods:

Modified Raman-Nath formalism incorporating losses.
Utilized four second-order coupled wave equations.
Analyzed a wide range of loss factors and grating thicknesses.
Experimental measurements of diffracted orders for bleached gratings.

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Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

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Last Updated: Jun 17, 2026

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Published on: July 18, 2015

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Published on: September 25, 2020

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

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Main Results:

The four-wave coupling model shows significant deviations from two-wave models.
Efficiency is highly dependent on index modulation, thickness, and loss.
Optimum exposure is linked to grating thickness for maximum efficiency.
Experimental data aligns well with the developed theoretical model.

Conclusions:

The enhanced formalism provides a more accurate prediction of lossy grating performance.
This unified approach covers practical hologram parameters.
The study validates the model with new experimental evidence for bleached gratings.