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We developed a novel partitioned gradient-index phononic crystal (GRIN-PC) for easier flat lens design. This design allows direct calculation of refractive indices, simplifying wave manipulation for acoustic and elastic applications.

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Area of Science:

  • Acoustics and wave physics
  • Materials science and engineering
  • Optics and photonics

Background:

  • Gradient-index phononic crystals (GRIN-PC) are explored for flat lenses in acoustic and elastic wave manipulation.
  • Designing GRIN-PC lenses typically requires complex inverse design and iterative computations.
  • Current methods limit the practical application of GRIN-PC in realizing flat lenses.

Purpose of the Study:

  • To propose a novel partitioned GRIN-PC design for simplified flat lens fabrication.
  • To enable direct calculation of refractive indices for precise wave manipulation.
  • To demonstrate the versatility of the partitioned GRIN-PC for wave engineering.

Main Methods:

  • Introducing partitions between layers in GRIN-PC to isolate wave propagation.
  • Developing a direct calculation method for refractive indices based on the partitioned design.
  • Designing and experimentally validating partitioned GRIN-PC based collimators and Bessel-beam generators.

Main Results:

  • The partitioned GRIN-PC design allows accurate control of the phase gradient at the lens' end.
  • Direct calculation of refractive indices is achieved, overcoming previous computational limitations.
  • Experimental validation confirms the effectiveness of the design for wave manipulation.

Conclusions:

  • The partitioned GRIN-PC offers a simplified and efficient approach to designing flat lenses.
  • This novel design significantly enhances the applicability of GRIN-PC in acoustic and elastic wave engineering.
  • The method provides a versatile platform for advanced wave manipulation applications.