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X-ray Crystallography

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Related Experiment Video

Updated: Feb 25, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Broadband All-angle Negative Refraction by Optimized Phononic Crystals.

Yang Fan Li¹, Fei Meng¹, Shiwei Zhou²

¹Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria, 3122, Australia.

Scientific Reports

|August 9, 2017

Summary

This study introduces a novel numerical method to design phononic crystals for broadband all-angle negative refraction (AANR). The optimized steel/air crystal achieves a record AANR range, enabling advanced focusing and self-collimation effects.

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Last Updated: Feb 25, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Published on: November 21, 2019

Area of Science:

Acoustics and Materials Science
Condensed Matter Physics
Wave Phenomena

Background:

All-angle negative refraction (AANR) in phononic crystals is crucial for wave manipulation.
The operational frequency range of AANR is limited by material properties and structure.
Theoretical limits for maximizing AANR frequency ranges remain elusive.

Purpose of the Study:

To develop a numerical approach for designing two-dimensional phononic crystals with broadband AANR.
To achieve broadband AANR without requiring a negative refractive index.
To explore the potential of topology optimization for designing advanced phononic materials.

Main Methods:

Analysis of the AANR mechanism to formulate a topology optimization problem.
Application of the bi-directional evolutionary structural optimization (BESO) method.
Numerical simulation and analysis of the designed phononic crystal.

Main Results:

A novel steel/air phononic crystal design exhibiting a record AANR range exceeding 20%.
Demonstration of broadband AANR without a negative index.
Investigation of focusing effects, including superlensing and self-collimation.

Conclusions:

The proposed numerical approach effectively designs phononic crystals for broadband AANR.
The optimized phononic crystal demonstrates multifunctional wave manipulation capabilities.
This work opens new avenues for designing advanced acoustic and elastic devices.