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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Published on: August 15, 2018

Large elasto-optic effect and reversible electrochromism in multiferroic BiFeO3.

D Sando¹, Yurong Yang², E Bousquet³

¹Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.

Nature Communications

|March 1, 2016

Summary

This summary is machine-generated.

Strain engineering in bismuth ferrite (BiFeO3) thin films significantly alters optical properties, offering a new pathway for advanced photonic devices. This research highlights a novel electrochromic effect in multiferroics, enhancing their potential for optical applications.

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Area of Science:

Materials Science
Condensed Matter Physics
Photonics

Background:

Optical field control traditionally relies on electro-optic or acousto-optic effects in single crystals like LiNbO3.
Ferroelectric oxide thin film technology is rapidly advancing, impacting electronics, spintronics, and photovoltaics.

Purpose of the Study:

To investigate the impact of epitaxial strain engineering on the optical response of BiFeO3 thin films.
To explore the potential of multiferroic materials for novel photonic and acousto-optic devices.

Main Methods:

Epitaxial strain engineering was applied to BiFeO3 thin films.
Optical properties, including refractive index and light absorption, were measured under varying strain conditions.
The influence of electric fields on strain-driven optical changes was investigated.

Main Results:

A significant variation in the optical index of BiFeO3 with applied strain was observed, yielding an effective elasto-optic coefficient exceeding that of quartz.
A strain-driven change in light absorption, akin to piezochromism, was detected.
This absorption change was found to be electrically controllable, reversible, remanent, and defect-independent, demonstrating an electrochromic effect.

Conclusions:

Epitaxial strain engineering offers a powerful method to tune the optical properties of BiFeO3 thin films.
The observed strain-induced and electrically controlled electrochromic effect in BiFeO3 expands the application scope of multiferroics in photonics.
These findings pave the way for developing novel thin-film acousto-optic devices leveraging the coupled ferroic, piezoelectric, and optical responses.