A biomimetic projector with high subwavelength directivity based on dolphin biosonar

Yu Zhang, Xiaowei Gao, Sai Zhang, Wenwu Cao, Liguo Tang, Ding Wang, Yan Li

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Abstract

Based on computed tomography of a Yangtze finless porpoise's biosonar system, a biomimetic structure was designed to include air cavity, gradient-index material, and steel outer-structure mimicking air sacs, melon, and skull, respectively. The mainlobe pressure was about three times higher, the angular resolution was one order of magnitude higher, and the effective source size was orders of magnitude larger than those of the subwavelength source without the biomimetic structure. The superior subwavelength directivity over a broad bandwidth suggests potential applications of this biomimetic projector in underwater sonar, medical ultrasonography, and other related applications.

Original languageEnglish (US)
Article number123502
JournalApplied Physics Letters
Volume105
Issue number12
DOIs
StatePublished - Sep 22 2014

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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