Related Experiment Video
Updated: Feb 22, 2026
07:03
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
9.3K
Observation of polarization-maintaining light propagation in depoled compositionally disordered ferroelectrics
Optics Letters
|September 29, 2017
Summary
Light polarization in ferroelectrics behaves uniquely, forming lattices in super-crystals below the Curie temperature. This ordered structure preserves light polarization, unlike disordered states which cause scattering.
Area of Science:
- Condensed matter physics
- Materials science
- Optics
Background:
- Depoled ferroelectrics typically scatter light due to random birefringence.
- Understanding light-matter interactions in ferroelectric materials is crucial for advanced optical applications.
Purpose of the Study:
- To investigate the polarization state of light in bulk depoled composite ferroelectrics below the Curie temperature.
- To elucidate the relationship between ferroelectric structure and light propagation characteristics.
Main Methods:
- Optical measurements of light polarization state.
- Analysis of light scattering and depolarization phenomena.
- Microscopy and structural characterization of ferroelectric states.
Main Results:
- Light remains fully polarized along crystal principal axes in specific ferroelectric states.
- Formation of polarized speckles organized into a spatial lattice observed.
- Lattices correlate with the emergence of a spontaneous super-crystal structure.
- Polarization lattices diminish with the transition to disordered polar nanoregions above the critical point.
Conclusions:
- A novel phenomenon of preserved light polarization in ordered ferroelectric super-crystals is reported.
- The spatial lattice of polarized speckles is a key indicator of the coherent mosaic ferroelectric structure.
- Ferroelectric ordering significantly influences light polarization, offering potential for optical control.
More Related Videos
Related Concept Videos
01:31Dielectric Polarization in a Capacitor
6.1K
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...
6.1K
01:29Potential Due to a Polarized Object
827
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
827
01:28Induced Electric Dipoles
4.9K
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...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.9K
01:31Ferromagnetism
3.2K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.2K
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.8K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.8K
01:26Susceptibility, Permittivity and Dielectric Constant
3.2K
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.
3.2K