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Negative Refraction Guided by a Glide-Reflection Symmetric Crystal Interface

  • 0Optoelectronic Engineering and Technology Research Center, Jiangnan University, Wuxi 214122, China.
Materials (basel, Switzerland) +

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March 27, 2025

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March 27, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

This study introduces glide-reflection (GR) symmetrical phononic crystals (PCs) to achieve negative refraction for ultra-high-resolution acoustic lenses. The research demonstrates enhanced negative sound refraction using coupled edge states (CESs) in novel PC designs.

Area Of Science

  • Acoustics
  • Condensed Matter Physics
  • Materials Science

Background

  • Phononic crystals (PCs) with negative refractive indices are key for ultra-high-resolution acoustic lenses.
  • Achieving negative refraction in acoustic systems is an active area of research.

Purpose Of The Study

  • To present a novel glide-reflection (GR) symmetrical phononic crystal (PC) design.
  • To demonstrate negative refraction using edge states (ESs) and coupled edge states (CESs).
  • To provide a new methodology for designing acoustic negative refraction devices.

Main Methods

  • Design of GR symmetrical phononic crystals.
  • Excitation of edge states (ESs) via Wannier center mismatch.
  • Stacking of GR symmetric PC interfaces to form coupled edge states (CESs).
  • Finite element method (FEM) simulations for verification.

Main Results

  • Emergence of ESs due to Wannier center mismatch in GR symmetric PCs.
  • Achieved negative refraction by exciting ESs with negative dispersion.
  • Observation of CESs from coupling between adjacent GR symmetric PC interfaces.
  • Demonstrated stronger negative sound refraction with negative transverse displacement via CESs.

Conclusions

  • The proposed GR symmetrical PC structure effectively achieves negative refraction.
  • Coupled edge states (CESs) enhance negative sound refraction effects.
  • This work offers a novel approach for the design of acoustic negative refraction and ultra-high-resolution acoustic lenses.

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