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Updated: Sep 19, 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

A soft-clamped topological waveguide for phonons.

Xiang Xi^1,2, Ilia Chernobrovkin^3,4, Jan Košata^5,6

¹Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark. xiang.xi@nbi.ku.dk.

|June 4, 2025

Summary

This summary is machine-generated.

Researchers developed ultralow-loss phononic waveguides using valley-Hall topological insulators. This breakthrough significantly reduces phonon loss, enabling robust, topologically protected transport on-chip for advanced quantum technologies.

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Area of Science:

Condensed Matter Physics
Topological Materials
Phononics

Background:

Topological insulators, initially discovered for electrons, have been extended to bosonic systems like photons and phonons.
Topological protection offers theoretical backscattering immunity for wave propagation in artificial lattices.
Previous phononic waveguides suffered from high propagation losses (dB cm⁻¹), limiting practical applications.

Purpose of the Study:

To engineer on-chip phononic waveguides with drastically reduced dissipation losses.
To investigate and quantify the backscattering protection in topological phononic systems.
To create a clean bosonic system for studying topological protection and non-Hermitian physics.

Main Methods:

Combined advanced dissipation engineering, specifically soft clamping, with valley-Hall topological insulator concepts for phonons.
Fabrication of on-chip phononic waveguides.
Utilized high-resolution ultrasound spectroscopy to measure propagation losses and backscattering.

Main Results:

Achieved unprecedentedly low phononic propagation losses of 3 dB km⁻¹ at room temperature, orders of magnitude lower than previous devices.
Demonstrated highly effective backscattering protection, with phonons navigating a 120° bend with 99.99% probability.
Quantified minimal phonon loss, with less than one in a million lost during propagation.

Conclusions:

The developed phononic waveguides exhibit ultralow loss and robust topological protection, overcoming previous limitations.
This work paves the way for new research in low-loss phononic devices and topological physics.
Provides a clean platform for exploring topological protection and non-Hermitian phenomena in bosonic systems.