Phononic Band Structure Engineering for High- Q Gigahertz Surface Acoustic Wave Resonators on Lithium Niobate
Phononic Band Structure Engineering for High- Q Gigahertz Surface Acoustic Wave Resonators on Lithium Niobate
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DOI：
10.1103/physrevapplied.12.014022
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发表时间：
2019-01
影响因子：
4.6
通讯作者：
Linbo Shao;Smarak Maity;Lu Zheng;Lue Wu;A. Shams-Ansari;Young-Ik Sohn;Eric Puma;M. Gadalla;Mian Zhang;Cheng Wang;E. Hu;K. Lai;M. Lončar
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文献类型：
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作者：
Linbo Shao;Smarak Maity;Lu Zheng;Lue Wu;A. Shams-Ansari;Young-Ik Sohn;Eric Puma;M. Gadalla;Mian Zhang;Cheng Wang;E. Hu;K. Lai;M. Lončar
千兆赫频率的声子与固体中的电子、光子和原子系统相互作用，因此在信号处理、传感和量子技术中有广泛的应用。在这种集成声子系统中，限制表面声子的声表面波(SAW)腔具有小的模式尺寸、低的损耗和高效的电转换能力，因此可以起到至关重要的作用。到目前为止，在千兆赫兹频率下实现声表面波腔的高质量(Q)因数和较小的声子模尺寸一直是一个挑战。在这里，我们展示了工作在千兆赫频率的LiNbO_3上的声表面波腔，它具有高Q因子，在室温下超过$2\x 10^4$(在4开尔文时$6\x 10^4$)和低至$1.87的模面积。这是通过声子带结构工程实现的，它提供了高限制和低机械损耗。我们的声表面波腔的频率Q积(FQ)大于$10^{13}$。这些高FQ和小模尺寸的SAW腔可以应用于量子声子学和集成声子、光子和固态量子比特的混合系统。
Phonons at gigahertz frequencies interact with electrons, photons, and atomic systems in solids, and therefore have extensive applications in signal processing, sensing, and quantum technologies. Surface acoustic wave (SAW) cavities that confine surface phonons can play a crucial role in such integrated phononic systems due to small mode size, low dissipation, and efficient electrical transduction. To date, it has been challenging to achieve high quality (Q) factor and small phonon mode size for SAW cavities at gigahertz frequencies. Here, we demonstrate SAW cavities on lithium niobate operating at gigahertz frequencies, featuring high Q factors in excess of $2\times10^4$ at room temperature ($6 \times 10^4$ at 4 Kelvin) and mode area as low as $1.87 {\lambda}^2$. This is achieved by phononic band structure engineering, which provides high confinement with low mechanical loss. The frequency-Q products (fQ) of our SAW cavities are greater than $10^{13}$. These high-fQ and small mode size SAW cavities could enable applications in quantum phononics and integrated hybrid systems with phonons, photons, and solid-state qubits.