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<p>Extending photocarrier lifetime, accelerating photostrictive strain buildup, and engaging more light–lattice interactions are essential to increase the bulk photostriction rate—a key figure of merit integrating strain magnitude and generation speed (typically &lt; 10<sup>−3</sup> s<sup>−1</sup> in bulk ferroelectrics)—for efficient remote ultrasound generation. Here, we report non-poled terbium-doped (K,Na)NbO<sub>3</sub> ceramics, where Tb<sup>3+</sup> 4<i>f</i>-electron trapping prolongs photocarrier lifetime, enabling efficient carrier drift to domain walls for screening depolarization field. Hierarchical nanostructures—dense nanodomains (accelerating photostriction via coupled local bulk photovoltaic and converse piezoelectric effects) and subwavelength grains (more light–lattice interactions and enhancing collective photostriction)—yield an outstanding bulk photostriction rate of 6.41×10<sup>−1</sup> s<sup>−1</sup>, two orders above conventional bulk ferroelectrics. Non-poled ceramics avoid depoling issue, enabling robust and low power opto-ultrasonic transducers for reliable remote structural health monitoring. Our bulk ferroelectric design strategy enables cost-effective, high-performance opto-ultrasonic sensing technologies.</p>

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Giant photostriction rate for remote opto-ultrasonic structural health monitoring

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月24日

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  • Jie Yin,
  • Yuxuan Yang,
  • Xiaoming Shi,
  • Chunlin Zhao,
  • Cong Lin,
  • Hong Tao,
  • Yang Zhang,
  • David Boon Kiang Lim,
  • Chao Jiang,
  • Liming Lei,
  • Yunfeng Song,
  • Haijun Wu,
  • Xiangdong Ding,
  • Jun Sun,
  • Fei Li,
  • Jiagang Wu,
  • Kui Yao

摘要

Extending photocarrier lifetime, accelerating photostrictive strain buildup, and engaging more light–lattice interactions are essential to increase the bulk photostriction rate—a key figure of merit integrating strain magnitude and generation speed (typically < 10−3 s−1 in bulk ferroelectrics)—for efficient remote ultrasound generation. Here, we report non-poled terbium-doped (K,Na)NbO3 ceramics, where Tb3+ 4f-electron trapping prolongs photocarrier lifetime, enabling efficient carrier drift to domain walls for screening depolarization field. Hierarchical nanostructures—dense nanodomains (accelerating photostriction via coupled local bulk photovoltaic and converse piezoelectric effects) and subwavelength grains (more light–lattice interactions and enhancing collective photostriction)—yield an outstanding bulk photostriction rate of 6.41×10−1 s−1, two orders above conventional bulk ferroelectrics. Non-poled ceramics avoid depoling issue, enabling robust and low power opto-ultrasonic transducers for reliable remote structural health monitoring. Our bulk ferroelectric design strategy enables cost-effective, high-performance opto-ultrasonic sensing technologies.