Acoustic superlens using Helmholtz-resonator-based metamaterials

作者：Yang, Xishan; Yin, Jing; Yu, Gaokun^*; Peng, Linhui; Wang, Ning

来源：Applied Physics Letters, 2015, 107(19): 193505.

DOI：10.1063/1.4935589

Acoustic superlens provides a way to overcome the diffraction limit with respect to the wavelength of the bulk wave in air. However, the operating frequency range of subwavelength imaging is quite narrow. Here, an acoustic superlens is designed using Helmholtz-resonator-based metamaterials to broaden the bandwidth of super-resolution. An experiment is carried out to verify subwavelength imaging of double slits, the imaging of which can be well resolved in the frequency range from 570 to 650 Hz. Different from previous works based on the Fabry-Perot resonance, the corresponding mechanism of subwavelength imaging is the Fano resonance, and the strong coupling between the neighbouring Helmholtz resonators separated at the subwavelength interval leads to the enhanced sound transmission over a relatively wide frequency range.

• 出版日期2015-11-9
• 单位中国海洋大学