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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

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Published on: August 21, 2018

Mode-determined unidirectional phonon transducers for minimal frequency splitter.

Juxing He^1,2, Shibin Zhang^3,4, Pengcheng Zheng^1,2

¹State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Shanghai, China.

Nature Communications

|November 23, 2025

Summary

This study introduces a novel piezoelectric substrate for precise phonon manipulation. It enables unidirectional phonon emission and demonstrates a minimal on-chip frequency splitter with high transmission ratios.

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Area of Science:

Acousto-optics
Spintronics
Quantum Technology
Surface Acoustic Waves (SAW)

Background:

Precise phonon manipulation is crucial for advanced fields like quantum technology.
Surface acoustic waves (SAW) on piezoelectric substrates offer a promising platform for phonon control.
Phonon emission, alongside propagation, is a key design consideration.

Purpose of the Study:

To develop a novel heterogeneous substrate for enhanced phonon manipulation.
To realize unidirectional emission of different phonon modes using symmetric transducers.
To propose and demonstrate a minimal on-chip frequency splitter based on the new platform.

Main Methods:

Fabrication of a heterogeneous substrate using ion slicing technology, bonding 42°Y cut LiTaO3 thin film on 4H-SiC.
Utilizing a double-modes natural unidirectional transducer (DMNUDT) design.
Characterization of unidirectional phonon emission and frequency splitting capabilities.

Main Results:

Successful fabrication of the LiTaO3/4H-SiC heterogeneous substrate.
Realization of unidirectional emission of shear horizontal SAW and longitudinal leaky SAW phonons in opposite directions using symmetric transducers.
Demonstration of a minimal on-chip piezoelectric frequency splitter with >15 dB transmission ratio within a resonator footprint.

Conclusions:

The developed DMNUDT on the heterogeneous substrate enables unprecedented control over phonon emission directionality.
The novel platform facilitates the creation of compact and efficient on-chip signal processing devices like frequency splitters.