DOE OSTI · 3023971
Integrated phononic waveguide on thin-film lithium niobate on diamond
Abstract
Here, we demonstrate wavelength-scale phononic waveguides formed by transfer-printed thin-film lithium niobate (LN) on bulk diamond, a material stack that combines the strong piezoelectricity of LN with the high acoustic velocity and color-center compatibility of diamond. We characterize a delay line based on a 100 μm long phononic waveguide at room and cryogenic temperatures. The total insertion loss through the device at 4 K is −5.8 dB, corresponding to a $>$ 50 % transducer efficiency, at a frequency of 2.8 GHz. Our work represents a step toward phonon-mediated hybrid quantum systems consisting of strain-sensitive color centers in diamond.
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Malik, Sultan [Stanford Univ., CA (United States)] (ORCID:0009000362002837), Mayor, Felix M. [Stanford Univ., CA (United States)] (ORCID:0000000198493517), Jiang, Wentao [Stanford Univ., CA (United States)] (ORCID:0000000265924322), Oh, Hyunseok [Univ. of California, Santa Barbara, CA (United States)] (ORCID:0000000300763844), Padgett, Carl [Univ. of California, Santa Barbara, CA (United States)] (ORCID:0000000250721485), Dharod, Viraj [Univ. of California, Santa Barbara, CA (United States)], Venkatraman, Jayameenakshi [Univ. of California, Santa Barbara, CA (United States)] (ORCID:0000000217363807), Jayich, Ania C. Bleszynski [Univ. of California, Santa Barbara, CA (United States)] (ORCID:0000000334807032), Safavi-Naeini, Amir H. [Stanford Univ., CA (United States)] (ORCID:0000000161761274). 2025-10-13. Integrated phononic waveguide on thin-film lithium niobate on diamond. https://doi.org/10.1063/5.0285138
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