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Thermal Modulation of Gigahertz Surface Acoustic Waves on Lithium Niobate

Shao, Linbo and Ding, Sophie W. and Ma, Yunwei and Zhang, Yuhao and Sinclair, Neil and Lončar, Marko (2022) Thermal Modulation of Gigahertz Surface Acoustic Waves on Lithium Niobate. Physical Review Applied, 18 (5). Art. No. 054078. ISSN 2331-7019. doi:10.1103/physrevapplied.18.054078.

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Surface-acoustic-wave (SAW) devices have a wide range of applications in microwave signal processing. Microwave SAW components benefit from higher quality factors and much smaller crosstalk when compared to their electromagnetic counterparts. Efficient routing and modulation of SAWs are essential for building large-scale and versatile acoustic wave circuits. Here, we demonstrate integrated thermoacoustic modulators using two SAW platforms: bulk lithium niobate and thin-film lithium niobate on sapphire. In both approaches, the gigahertz-frequency SAWs are routed by integrated acoustic waveguides, while on-chip microheaters are used to locally change the temperature, and thus, control the phase of the SAW. Using this approach, we achieve phase changes of over 720° with the responsibility of 2.6°/mW for bulk lithium niobate and 0.52°/mW for lithium niobate on sapphire. Furthermore, we demonstrate amplitude modulation of SAWs using acoustic Mach-Zehnder interferometers. Our thermoacoustic modulators can enable reconfigurable acoustic signal processing for next-generation wireless communications and microwave systems.

Item Type:Article
Related URLs:
URLURL TypeDescription
Shao, Linbo0000-0002-0615-7848
Lončar, Marko0000-0002-5029-5017
Additional Information:This work is supported by DOE HEADS-QON Grant No. DE-SC0020376, ONR Grant No. N00014-20-1-2425, DOD Grant No. FA8702-15-D-0001, and Raytheon Grant No. A40210. L.S. acknowledges funding from Virginia Tech Foundation. N.S. acknowledges funding from the AQT Intelligent Quantum Networks and Technologies (INQNET) research program.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0020376
Office of Naval Research (ONR)N00014-20-1-2425
Air Force Office of Scientific Research (AFOSR)FA8702-15-D-0001
Raytheon CompanyA40210
Virginia Tech FoundationUNSPECIFIED
AQT Intelligent Quantum Networks and Technologies (INQNET)UNSPECIFIED
Issue or Number:5
Record Number:CaltechAUTHORS:20230117-369491100.17
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118823
Deposited By: Research Services Depository
Deposited On:01 Feb 2023 18:21
Last Modified:01 Feb 2023 18:21

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