Liew, W. H., Chen, Y., Alexe, M., & Yao, K. (2022). Fast Photostriction in Ferroelectrics. Small, 18(7), 2106275. Portico. https://doi.org/10.1002/smll.202106275
Light-induced non-thermal strain, known as the photostrictive effect, offers a potential way to excite mechanical strain and acoustic wave remotely. The anisotropic photostrictive effect induced by the combination of bulk photovoltaic effect (BPVE) and converse piezoelectric effect in ferroelectric materials is known as too small and slow for the applications requiring a high strain rate, such as ultrasound generation and high-speed signal transmission. Here, we report a strategy to achieve high rate dynamic photostrictive strain by utilizing local fast responses under modulating continuous light excitation in resonance condition. A strain rate of 8.06 × 10-3 s-1 was demonstrated under continuous light excitation, which is at least one order magnitude higher than previous studies on bulk samples as known in the literature. The significant photostrictive response existed even in unpoled ferroelectric material without overall polarization. Our theoretical analyses showed that fast ferroelectric photostriction can be obtained through the combinational interaction mechanism of local BPVE and local converse piezoelectric effect existing only in microscopic scale, thus circumventing the slow and low efficient BPVE charging up process across the macroscopic electrical terminals. Our achieved fast photostriction results and the new understandings will open the new opportunities to realize future wireless signal transmission and light-acoustic devices.
This research / project is supported by the Agency for Science, Technology and Research - RIE2020 AME Industry Alignment Fund - Pre-positioning Programme (IAF-PP)
Grant Reference no. : A20F5a0043
This research / project is supported by the National Research Foundation, Singapore - Competitive Research Programme
Grant Reference no. : NRF-CRP15-2015-04
This is the peer reviewed version of the following article: Liew, W. H., Chen, Y., Alexe, M., & Yao, K. (2022). Fast Photostriction in Ferroelectrics. Small, 18(7), 2106275. Portico. https://doi.org/10.1002/smll.202106275, which has been published in final form at doi.org/10.1002/smll.202106275. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited