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Equivalent Capacitance

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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...

Equivalent Capacitance

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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Light-Induced Capacitance Tunability in Ferroelectric Crystals.

David Páez-Margarit¹, Fernando Rubio-Marcos², Diego A Ochoa¹

¹Department of Physics , Universitat Politècnica de Catalunya , Barcelona 08034 , Spain.

ACS Applied Materials & Interfaces

|June 23, 2018

Summary

Light can reversibly control ferroic properties in ferroelectrics by adjusting capacitance via light power. This photodielectric effect, driven by locally free charges at domain walls, is independent of light wavelength.

Keywords:

barium titanate capacitance tunability ferroelectric crystals light-induced phenomena photodetectors

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Area of Science:

Materials Science
Condensed Matter Physics
Optoelectronics

Background:

Remote control of ferroic properties using light is a key research area.
Understanding light-matter interactions in ferroelectrics is crucial for advanced materials.

Purpose of the Study:

To investigate unresolved issues in light-matter coupling in ferroelectrics.
To demonstrate reversible control of ferroelectric properties using light power.

Main Methods:

Experimental investigation of capacitance changes in ferroelectrics under varying light power.
Analysis of photodielectric performance across the visible light spectrum.
Verification of the role of domain wall charges.

Main Results:

Capacitance and dielectric constant are reversibly tunable with light power.
High photodielectric performance is observed across a wide visible light range.
The phenomenon is wavelength-independent.

Conclusions:

The observed photodielectric effect is attributed to "locally free charges" at ferroelectric domain walls.
This provides a mechanism for light-controlled ferroelectric properties.
Wavelength-independent control offers practical advantages.