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Dielectric Polarization in a Capacitor

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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: Apr 5, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Time-Dependent, Optically Controlled Dielectric Function.

Maxim Artamonov¹, Tamar Seideman¹

¹Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States.

The Journal of Physical Chemistry Letters

|August 12, 2015

Summary

This summary is machine-generated.

Scientists can control plasmon resonance by optically modulating the dielectric function of molecular monolayers on metal surfaces. A laser pulse temporarily aligns molecules, altering the dielectric function and influencing plasmon behavior.

Keywords:

molecular alignment molecular dynamics polarizability self-assembled monolayer surface plasmon resonance

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Area of Science:

Surface science
Plasmonics
Molecular electronics

Background:

Plasmon resonance phenomena are crucial in various optical applications.
Controlling these phenomena at the molecular level is an ongoing challenge.

Purpose of the Study:

To propose and investigate optical modulation of a molecular monolayer's dielectric function.
To demonstrate a method for controlling plasmon resonance phenomena.

Main Methods:

Utilizing a laser pulse with moderate intensity and linear polarization.
Employing molecular dynamics calculations to simulate time-dependent dielectric function changes.

Main Results:

Demonstrated that optical modulation can alter the dielectric function of a molecular monolayer.
Showcased the temporary alignment of molecules by the laser pulse.
Confirmed the monolayer returns to its initial state post-pulse.

Conclusions:

Optical modulation of dielectric function offers a viable route to control plasmon resonance.
This technique provides a dynamic and reversible method for manipulating surface plasmons.