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Determination of Crystal Structures01:29

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Negative Refraction Guided by a Glide-Reflection Symmetric Crystal Interface.

Yuzhong Zhou1, Tian Sang1, Yueke Wang1

  • 1Optoelectronic Engineering and Technology Research Center, Jiangnan University, Wuxi 214122, China.

Materials (Basel, Switzerland)
|March 27, 2025
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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.

Keywords:
glide-reflection symmetrynegative refractionphononic crystal

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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.