Photostriction in BiFeO3: wavelength dependence

TL;DR

This study investigates the wavelength-dependent photostriction in BiFeO3, revealing two peaks in mechanical deformation at near-UV and green wavelengths, highlighting the material's optomechanical response to different light energies.

Contribution

It demonstrates the wavelength dependence of photostriction in BiFeO3 and identifies specific spectral regions with maximum mechanical response, advancing understanding of optomechanical effects in ferroelectric materials.

Findings

Mechanical deformation peaks in near-UV and green wavelengths

Photostriction response varies with incident light wavelength

BiFeO3 exhibits distinct optomechanical behavior across the spectrum

Abstract

In electrically polar solids optomechanical effects result from the combination of two main processes, electric field-induced strain and photon-induced voltages. Whereas the former depends on the electrostrictive ability of the sample to convert electric energy into mechanical energy, the latter is caused by the capacity of photons with appropriate energy to generate charges and, therefore, can depend on wavelength.We report here on mechanical deformation of BiFeO3 and its response time to discrete wavelengths of incident light ranging from 365 to 940 nm. The mechanical response of BiFeO3 is found to have two maxima in near-UV and green spectral wavelength regions.