声学
超声波传感器
材料科学
镜头(地质)
水下
小型化
声阻抗
超材料
光学
传感器
超声波
焦距
光电子学
物理
纳米技术
海洋学
地质学
作者
Zhaoxi Li,Shenghui Yang,Danfeng Wang,Shan Han,Dongdong Chen,Chunlong Fei,Meng Xiao,Yintang Yang
摘要
Ultrasound is widely used in various applications, ranging from ultrasound imaging to particle manipulation. Acoustic materials, such as phononic crystal (PC) and metamaterials, are designed to control the propagation and concentration of ultrasound. While traditional metal-based underwater PCs are usually limited to large 2D structures and used for low-frequency sound wave manipulation, it is difficult to reach the ultrasonic frequency region of the order of 1 MHz with cumbersome metallic structures. Here, in this work, we proposed a 3D printed gradient-index phononic crystal (GRIN PC) lens based on the hyperbolic secant index profile. With a huge impedance difference between air and the 3D printing materials, the GRIN PC lens adhered to the ultrasonic transducers can easily manipulate the propagation of acoustic waves and achieve wave focusing. This transparent and flat lens demonstrates the beam focusing in water even at a high frequency. The integration and miniaturization of transducer and lens make particle capture convenient in relevant medical applications.
科研通智能强力驱动
Strongly Powered by AbleSci AI