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Updated: Jun 30, 2025
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Fabrication of Surface Acoustic Wave Devices on Lithium Niobate
Published on: June 18, 2020
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Surface modification and coherence in lithium niobate SAW resonators
Rachel G Gruenke1, Oliver A Hitchcock2, E Alex Wollack3
1Department of Applied Physics and Ginzton Laboratory, Stanford University, Stanford, CA, 94305, USA. rgruenke@stanford.edu.
Scientific Reports
|March 21, 2024
Summary
Investigating lithium niobate acoustic resonators reveals that surface treatments, while seemingly improving quality, can unexpectedly increase two-level system (TLS) density, impacting quantum device performance.
Area of Science:
- Quantum acoustics
- Materials science
- Surface physics
Background:
- Lithium niobate (LiNbO3) is crucial for quantum acoustic technologies due to its piezoelectric properties and thin-film availability.
- Acoustic resonators in LiNbO3 suffer from decoherence and dephasing caused by two-level systems (TLS) at radio frequencies and cryogenic temperatures.
- Understanding microscopic loss channels is essential for enhancing device performance.
Purpose of the Study:
- To investigate the impact of surface modifications on lithium niobate acoustic resonator performance.
- To correlate surface properties with the density and coupling of two-level systems (TLS).
- To identify fabrication-induced changes affecting acoustic resonator coherence.
Main Methods:
- Fabrication of lithium niobate acoustic wave resonators.
- Application of surface treatments: argon ion sputtering, annealing, and acid cleans.
- Characterization using cryogenic microwave spectroscopy, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM).
Main Results:
- Surface treatments altered the acoustic resonator properties.
- Cryogenic microwave spectroscopy quantified TLS density and coupling to mechanical modes.
- Surprisingly, treatments that appeared to improve surface quality (via XPS/AFM) coincided with increased TLS density.
Conclusions:
- Surface conditions and fabrication techniques significantly influence the coherence of acoustic resonators.
- There are critical gaps in understanding the microscopic origins of TLS in lithium niobate.
- Further research is needed to optimize fabrication processes for improved quantum acoustic device performance.
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