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Systematic Design and Experimental Demonstration of Transmission-Type Multiplexed Acoustic Metaholograms

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3];  [4];  [1];  [1];  [3];  [2];  [1]
  1. Univ. de Lorraine, Nancy (France)
  2. North Carolina State Univ., Raleigh, NC (United States); Pennsylvania State Univ., University Park, PA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. North Carolina State Univ., Raleigh, NC (United States)

Acoustic holograms have promising applications in sound-field reconstruction, particle manipulation, ultrasonic haptics, and therapy. This study reports on the theoretical, numerical, and experimental investigation of multiplexed acoustic holograms at both audio and ultrasonic frequencies via a rationally designed transmission-type acoustic metamaterial. The proposed metahologram is composed of two Fabry–Pérot resonant channels per unit cell, which enables the simultaneous modulation of the transmitted amplitude and phase at two desired frequencies. In contrast to conventional acoustic metamaterial-based holograms, the design strategy proposed here provides a new degree of freedom (frequency) that can actively tailor holograms that are otherwise completely passive and significantly enhances the information encoded in acoustic metamaterials. To demonstrate the multiplexed acoustic metamaterial, the projection of two different high-quality metaholograms is first shown at 14 and 17 kHz, with the patterns of the letters N and S. Then, two-channel ultrasound focusing and annular beams generation for the incident ultrasonic frequencies of 35 and 42.5 kHz are demonstrated. Furthermore, these multiplexed acoustic metaholograms offer a technical advance to tackle the rising challenges in the fields of acoustic metamaterials, architectural acoustics, and medical ultrasound.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1823698
Report Number(s):
LLNL-JRNL--817852; 1028192
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 27 Vol. 31; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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