Coherent Phonon-Induced Gigahertz Optical Birefringence and Its Manipulation in SrTiO₃.

ABSTRACT: Birefringence, which modulates the polarization of electromagnetic wave, has been commercially developed and widely used in modern photonics. Fostered by high-frequency signal processing and communications, feasible birefringence technologies operating in gigahertz (GHz) range are highly desired. Here, a coherent phonon-induced GHz optical birefringence and its manipulation in SrTiO₃ (STO) crystals are demonsrated. With ultrafast laser pumping, the coherent acoustic phonons with low damping are created in the transducer/STO structures. A series of transducer layers are examined and the optimized one with relatively high photon-phonon conversion efficiency, i.e., semiconducting LaRhO₃ film, is obtained. The most intriguing finding here is that, by virtue of high sensit

SUBMITTER: Sun T 

PROVIDER: S-EPMC9982545 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature