Raman Study on Photostrictive Perovskite SrIrO₃ Thin Films
Yi-De Liou1*, Yi-Chun Chen1, Ying-Hao Chu2, Jan-Chi Yang1
1Department of Physics, National Cheng Kung University, Tainan, Taiwan
2Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan
* presenting author:Yi-De Liou, email:leave710584@gmail.com
Photostrictive effect is a light-matter interaction which generates a reversible mechanical deformation in a material by irradiation of light, which is also called “photostriction”. Materials which possess photostrictive property can serve as energy conversion system, wireless remote control, photo sensor and so on, offering gifted potential towards novel photonic devices. However, the light-induced lattice changes in most of photostrictive materials are very small so that there are no practical applications hitherto. In this study, we investigated the visible-light-induced deformation of perovskite SrIrO₃(SIO), which exhibits high absorption across the visible spectrum, strong magneto-optic and magneto-structural couplings at room temperature. By using Raman spectroscopy, the phonon behaviors of the SIO thin film under various incident laser intensity were analyzed. Phonon deformation potential of SIO was calculated by lattice mismatch induced Raman shift, and then the photon-induced strain can be obtained. We found that SIO shows great photostriction compared to conventional semiconductors, polymers and perovskite oxides under the same experiment configuration. The strong photostrictive effect of SIO at room temperature paves a promising route towards new applications and multifunctionalities of photon-driven devices.

Keywords: photostrictive materials, photostriction, SrIrO₃, Raman spectroscopy