Piezoelectric-Metal Phononic Crystal Enabling GHz Tunable Ultrahigh $Q$ Quasi-BIC mode
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908418475819008 |
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| author | Xu, Xuankai Li, Jiawei Wang, Ruoyu Xiong, Ruihong Wang, Yiwei Shen, Xiaoqin Wu, Tao |
| author_facet | Xu, Xuankai Li, Jiawei Wang, Ruoyu Xiong, Ruihong Wang, Yiwei Shen, Xiaoqin Wu, Tao |
| contents | The integration of GHz-frequency, high quality factor ($Q$), and electrically tunable acoustic resonators holds significant potential for advancing applications in quantum information technologies, microwave photonics, and reconfigurable RF systems. However, simultaneously achieving these three characteristics within a single, scalable platform remains a fundamental challenge. Here, we report the experimental demonstration of a GHz quasi-BIC resonator in a piezoelectric thin-film shear horizontal (SH) wave system, achieved through a structurally simple piezoelectric-metal phononic crystal (PnC) architecture on a LiNbO$_3$ thin film. This approach enables leaky Fabry-Perot coupling mode and localized trapping quasi-BIC mode. Without the need for deep etching or intricate patterning, we achieve a room-temperature quality factor of $6\times 10^4$ at ~1 GHz in ambient air, corresponding to an $f\times Q$ product of $6\times 10^{13}$ Hz at quasi-BIC mode. Furthermore, we demonstrate efficient electrical tunability via low-voltage (0.6 V) electrothermal modulation of the PnC structure, enabling a reversible transition between trapped and transmission states and yielding a high-contrast amplitude modulation of 47.75 dB. Our results establish a lithography-friendly, fabrication-tolerant platform for realizing tunable, high-$Q$ acoustic resonators at GHz frequencies, overcoming longstanding barriers in phononic device engineering. This work opens new directions for scalable on-chip phononic circuits in quantum acoustics, reconfigurable RF systems, and signal processing applications. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_16757 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Piezoelectric-Metal Phononic Crystal Enabling GHz Tunable Ultrahigh $Q$ Quasi-BIC mode Xu, Xuankai Li, Jiawei Wang, Ruoyu Xiong, Ruihong Wang, Yiwei Shen, Xiaoqin Wu, Tao Applied Physics The integration of GHz-frequency, high quality factor ($Q$), and electrically tunable acoustic resonators holds significant potential for advancing applications in quantum information technologies, microwave photonics, and reconfigurable RF systems. However, simultaneously achieving these three characteristics within a single, scalable platform remains a fundamental challenge. Here, we report the experimental demonstration of a GHz quasi-BIC resonator in a piezoelectric thin-film shear horizontal (SH) wave system, achieved through a structurally simple piezoelectric-metal phononic crystal (PnC) architecture on a LiNbO$_3$ thin film. This approach enables leaky Fabry-Perot coupling mode and localized trapping quasi-BIC mode. Without the need for deep etching or intricate patterning, we achieve a room-temperature quality factor of $6\times 10^4$ at ~1 GHz in ambient air, corresponding to an $f\times Q$ product of $6\times 10^{13}$ Hz at quasi-BIC mode. Furthermore, we demonstrate efficient electrical tunability via low-voltage (0.6 V) electrothermal modulation of the PnC structure, enabling a reversible transition between trapped and transmission states and yielding a high-contrast amplitude modulation of 47.75 dB. Our results establish a lithography-friendly, fabrication-tolerant platform for realizing tunable, high-$Q$ acoustic resonators at GHz frequencies, overcoming longstanding barriers in phononic device engineering. This work opens new directions for scalable on-chip phononic circuits in quantum acoustics, reconfigurable RF systems, and signal processing applications. |
| title | Piezoelectric-Metal Phononic Crystal Enabling GHz Tunable Ultrahigh $Q$ Quasi-BIC mode |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2506.16757 |