title: Enhancement of backward second harmonic generation of acoustic waves in a resonant cavity by using a superlattice.
abstract: In this paper, the enhancement effect of backward second harmonic generation of acoustic waves in the system, consisting of a linear solid superlattice and a nonlinear liquid resonant cavity, is investigated analytically and numerically. Results show the nonlinear effect in the system can be enhanced drastically due to the existence of defective modes and the large acoustic impedance mismatching between solids and liquids. Because of the latter, the dual-resonance phenomenon can always take place approximately and automatically. These results are different from previous conclusions in optical fields.
authors.affiliation: Applied Acoustics Institute, Shaanxi Normal University, Shaanxi Key Laboratory of Ultrasound, Xian, Shaanxi 710062, China. Electronic address: chenshi@snnu.edu.cn.
authors.forename: Shi
authors.initials: S
authors.lastname: Chen
authors.affiliation: Applied Acoustics Institute, Shaanxi Normal University, Shaanxi Key Laboratory of Ultrasound, Xian, Shaanxi 710062, China.
authors.forename: Wenxu
authors.initials: W
authors.lastname: Hu
authors.affiliation: Applied Acoustics Institute, Shaanxi Normal University, Shaanxi Key Laboratory of Ultrasound, Xian, Shaanxi 710062, China.
authors.forename: Chenghui
authors.initials: C
authors.lastname: Wang
authors.affiliation: Applied Acoustics Institute, Shaanxi Normal University, Shaanxi Key Laboratory of Ultrasound, Xian, Shaanxi 710062, China.
authors.forename: Changchun
authors.initials: C
authors.lastname: Hao
authors.affiliation: Applied Acoustics Institute, Shaanxi Normal University, Shaanxi Key Laboratory of Ultrasound, Xian, Shaanxi 710062, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Xu
authors.affiliation: Applied Acoustics Institute, Shaanxi Normal University, Shaanxi Key Laboratory of Ultrasound, Xian, Shaanxi 710062, China.
authors.forename: Yinhong
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Applied Acoustics Institute, Shaanxi Normal University, Shaanxi Key Laboratory of Ultrasound, Xian, Shaanxi 710062, China.
authors.forename: Shuyu
authors.initials: S
authors.lastname: Lin
keywords: Defective modes; Nonlinear enhancement effect; Second harmonic generation; Superlattice