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Multiple beam splitting in elastic phononic crystal plates.

Hyuk Lee1, Joo Hwan Oh1, Yoon Young Kim1

  • 1WCU Multiscale Design Division, School of Mechanical and Aerospace Engineering, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea.

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Summary

This study experimentally demonstrates triple beam splitting using phononic crystal (PC) prisms in elastic plates. This research provides the first experimental evidence of splitting three or more ultrasonic elastic beams via PCs.

Keywords:
Beam splittingEqui-frequency contourPhononic crystalUltrasonic elastic wave

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Area of Science:

  • Acoustics
  • Materials Science
  • Solid Mechanics

Background:

  • Phononic crystals (PCs) exhibit unique wave manipulation properties, including negative refraction and double beam splitting.
  • Experimental evidence for splitting three or more ultrasonic elastic beams through PCs is currently lacking.

Purpose of the Study:

  • To experimentally demonstrate triple beam splitting in elastic plates with embedded phononic crystal prisms.
  • To elucidate the working mechanism behind triple beam splitting.
  • To investigate the influence of phononic crystal prism angles on beam splitting phenomena.

Main Methods:

  • Experimental setup involving an elastic plate with an embedded elastic phononic crystal prism.
  • Generation and detection of ultrasonic elastic beams.
  • Analysis of beam propagation and splitting patterns.

Main Results:

  • Successful experimental demonstration of triple beam splitting of ultrasonic elastic waves.
  • Observation of multiple beam splitting beyond triple splitting depending on prism geometry.
  • Correlation between phononic crystal prism angles and the number of split beams.

Conclusions:

  • This work provides the first experimental evidence of triple beam splitting using phononic crystal prisms.
  • The findings confirm the potential of phononic crystals for complex elastic wave manipulation.
  • The study opens avenues for designing advanced acoustic devices with tailored beam-splitting capabilities.