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Related Experiment Video

Updated: Aug 14, 2025

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Multi-dimensional wave steering with higher-order topological phononic crystal.

Changqing Xu¹, Ze-Guo Chen², Guanqing Zhang²

¹Division of Computer, Electrical and Mathematical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.

Science Bulletin

|January 19, 2023

Summary

This study demonstrates 3D wave steering using topological boundary states in phononic crystals. These higher-order topological insulators enable novel acoustic functionalities like negative refraction and interferometry.

Keywords:

3D acoustic interferometer Higher-order topological insulator Negative refraction Topological states

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Area of Science:

Condensed Matter Physics
Acoustics
Materials Science

Background:

Higher-order topological insulators expand the understanding of topological phases.
Topological phases are characterized by protected boundary states.

Purpose of the Study:

To explore three-dimensional (3D) wave-steering capabilities using topological boundary states.
To demonstrate novel acoustic functionalities enabled by different orders of topological states.

Main Methods:

Fabrication of a 3D phononic crystal with nontrivial bulk topology.
Utilizing the synergy of mirror and non-symmorphic glide symmetries.
Engineering boundary modes for specific wave manipulation functionalities.

Main Results:

Demonstrated 2D negative refraction of sound waves via first-order topological surface states.
Implemented a 3D acoustic interferometer using second-order topological hinge states.
Showcased wave steering across different dimensions using topological modes.

Conclusions:

Topological modes at different orders offer diverse wave-steering applications.
The 3D phononic crystal design enables advanced acoustic manipulation.
This work highlights the potential of higher-order topological insulators in acoustics.