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arXiv 2407.17693physics.app-ph
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低损耗宏观铌酸锂体声波谐振器的低温特性

Low Temperature Properties of Low-Loss Macroscopic Lithium Niobate Bulk Acoustic Wave Resonators

William M. Campbell, Leonardo Mariana, Sonali Parashar, Michael E. Tobar, Maxim Goryachev

AI总结:

本研究对克级宏观铌酸锂体声波谐振器开展低温特性研究,测得1-100 MHz纵向模式最高890万的品质因数,发现自诱导吸收与透明效应并通过缺陷非线性模型解释,明确了缺陷损耗为性能极限。

摘要:

我们研究了由压电铌酸锂晶片制备的克级宏观体声波(BAW)谐振器。通过在低温下对多种BAW模式进行精密测量,探究了其内部相互竞争的损耗机制。在1-100 MHz范围内的纵向BAW模式测得优异的品质因数,最高品质因数达890万,对应的品质因数×频率乘积为3.8×10¹⁴ Hz。通过测量强驱动音下的声学响应,观察到异常的自诱导吸收和透明效应。我们表明,利用声学耗散的非线性模型,这些观测结果可通过晶体内部的微观杂质和缺陷位点来解释。与这些缺陷相关的损耗决定了谐振器性能的最终极限,未来若能获得纯度更高的样品,其性能可得到提升。

英文摘要:

We investigate gram scale macroscopic bulk acoustic wave (BAW) resonators manufactured from plates of piezoelectric lithium niobate. The intrinsic competing loss mechanisms were studied at cryogenic temperature through precision measurements of various BAW modes. Exceptional quality factors were measured for the longitudinal BAW modes in the 1-100 MHz range, with a maximum quality factor of 8.9 million, corresponding to a quality factor $\times$ frequency product of 3.8 $\times 10^{14}$ Hz. Through measurements of the acoustic response to a strong drive tone, anomalous self induced absorption and transparency effects are observed. We show that such observations can be explained by microscopic impurities and defect sites in the crystal bulk by the use of a non linear model of acoustic dissipation. The losses associated with these defects provide the ultimate limit of resonator performance, which could be improved in the future if more pure samples were available.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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