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Far-field acoustic subwavelength imaging and edge detection based on spatial filtering and wave vector conversion

Author

Listed:
  • Chu Ma

    (Massachusetts Institute of Technology)

  • Seok Kim

    (Massachusetts Institute of Technology)

  • Nicholas X. Fang

    (Massachusetts Institute of Technology)

Abstract

The resolution of acoustic imaging suffers from diffraction limit due to the loss of evanescent field that carries subwavelength information. Most of the current methods for overcoming the diffraction limit in acoustics still operate in the near-field of the object. Here we demonstrate the design and experimental realization of an acoustic far-field subwavelength imaging system. Our system is based on wave vector filtering and conversion with a transmitter at the near-field and a spatially symmetrical receiver at the far-field. By tuning geometric parameters of the transmitting/receiving pair, different spatial frequency bands can be separated and projected to the far-field. Furthermore, far-field imaging and edge detection of subwavelength objects are experimentally demonstrated. The proposed system brings new possibilities for far-field subwavelength wave manipulation, which can be further applied to medical imaging, nondestructive testing, and acoustic communication.

Suggested Citation

  • Chu Ma & Seok Kim & Nicholas X. Fang, 2019. "Far-field acoustic subwavelength imaging and edge detection based on spatial filtering and wave vector conversion," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-018-08221-7
    DOI: 10.1038/s41467-018-08221-7
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    Cited by:

    1. Seok Kim & Sang-Hoon Nam & Seokho Kim & Young Tae Cho & Nicholas X. Fang, 2022. "Low Heat Capacity 3D Hollow Microarchitected Reactors for Thermal and Fluid Applications," Energies, MDPI, vol. 15(11), pages 1-15, June.
    2. Yurou Jia & Suying Zhang & Xuan Zhang & Houyou Long & Caibin Xu & Yechao Bai & Ying Cheng & Dajian Wu & Mingxi Deng & Cheng-Wei Qiu & Xiaojun Liu, 2024. "Compact meta-differentiator for achieving isotropically high-contrast ultrasonic imaging," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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