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<p>The development of diverse fields like acousto-optics, spintronics, quantum technology raises new demand on precise phonon manipulation, while surface acoustic wave (SAW) on piezoelectric substrate is a promising platform. Besides the widely studied on-propagating manipulation issues, the emission of phonon also serves as an important design consideration in the system. In this work, through ion slicing technology, heterogeneous substrate with 42°Y cut LiTaO<sub>3</sub> thin film directly bonded on 4H-SiC is fabricated. The heterogeneous substrate enables double-modes natural unidirectional transducer (DMNUDT). Determined by the vibrating mode, unidirectional emission of shear horizontal SAW phonons and longitudinal leaky SAW phonons to opposite direction by symmetric transducers is realized, which is beyond the capability of previous asymmetric unidirectional transducers. Based on the fascinating phonon radiation features of DMNUDT, we propose the minimal on-chip frequency splitter, that can split mixed frequency components of AC signal into channel. The demonstrated piezoelectric frequency splitter can achieve transmission ratio of greater than 15 dB within the footprint of a resonator.</p>

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Mode-determined unidirectional phonon transducers for minimal frequency splitter

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月23日

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  • Juxing He,
  • Shibin Zhang,
  • Pengcheng Zheng,
  • Xiaoli Fang,
  • Dongchen Sui,
  • Hulin Yao,
  • Xinjian Ke,
  • Dan Ling,
  • Mijing Sun,
  • Kai Huang,
  • Xin Ou

摘要

The development of diverse fields like acousto-optics, spintronics, quantum technology raises new demand on precise phonon manipulation, while surface acoustic wave (SAW) on piezoelectric substrate is a promising platform. Besides the widely studied on-propagating manipulation issues, the emission of phonon also serves as an important design consideration in the system. In this work, through ion slicing technology, heterogeneous substrate with 42°Y cut LiTaO3 thin film directly bonded on 4H-SiC is fabricated. The heterogeneous substrate enables double-modes natural unidirectional transducer (DMNUDT). Determined by the vibrating mode, unidirectional emission of shear horizontal SAW phonons and longitudinal leaky SAW phonons to opposite direction by symmetric transducers is realized, which is beyond the capability of previous asymmetric unidirectional transducers. Based on the fascinating phonon radiation features of DMNUDT, we propose the minimal on-chip frequency splitter, that can split mixed frequency components of AC signal into channel. The demonstrated piezoelectric frequency splitter can achieve transmission ratio of greater than 15 dB within the footprint of a resonator.