Wang Haiyang, Baker Chams, Kelly Liam, Tovar Pedro, Chen Liang, Bao Xiaoyi
Opt Express. 2022 Mar 14;30(6):8847-8856. doi: 10.1364/OE.450734.
High-frequency ultrasound sensors are essential for high-resolution medical ultrasonic imaging and industrial ultrasonic non-destructive monitoring. In this paper, we propose highly sensitive broadband ultrasound sensors based on fused dual-core chalcogenide-polymethyl methacrylate (AsSe-PMMA) microfibers. We demonstrate that ultrasound response is determined by the differential slope of transmission spectra in the dual-core microfiber, which is verified by detecting the acoustic response in various microfibers of different tapering parameters. A broadband ultrasound frequency range with a high signal-to-noise ratio (SNR) is achieved in the fused dual-core microfiber (DCM) with a sub-micron core diameter and a close core separation due to the large spectral slope at the quadrature points of the transmission spectrum. In addition, we experimentally demonstrate the sensing of ultrasound waves propagating with and without an aluminum plate in the DCM sensor. An ultrasound sensor with a broadband frequency range from 20 kHz to 80 MHz and an average SNR of 31 dB is achieved in a compact fused dual-core AsSe-PMMA microfiber when it is directly placed on a piezoelectric transducer (PZT).
高频超声传感器对于高分辨率医学超声成像和工业超声无损监测至关重要。在本文中，我们提出了基于双芯硫族化物 - 聚甲基丙烯酸甲酯（AsSe - PMMA）微纤维的高灵敏度宽带超声传感器。我们证明超声响应由双芯微纤维中传输光谱的微分斜率决定，这通过检测不同锥度参数的各种微纤维中的声学响应得到验证。由于传输光谱正交点处的大光谱斜率，在具有亚微米芯直径和紧密芯间距的双芯微纤维（DCM）中实现了具有高信噪比（SNR）的宽带超声频率范围。此外，我们通过实验证明了在DCM传感器中对有无铝板传播的超声波的传感。当将紧凑的双芯AsSe - PMMA微纤维直接放置在压电换能器（PZT）上时，可实现频率范围从20 kHz到80 MHz且平均SNR为31 dB的宽带超声传感器。
