Abstract
We propose and demonstrate an approach for 10 kHz to 34 MHz ultrasound detection based on a dual-core As2Se3-PMMA taper. We fabricate dual-core As2Se3-PMMA tapers with a Young’s modulus 24 times smaller than that of silica fibers, which enhances the acoustic response. Dual-core As2Se3-PMMA fiber tapers show high sensitivities to both shear and longitudinal waves due to the dual-core structure, low Young’s modulus, submicrometer dimension of the core, and the high-contrast interference pattern by the even and odd modes. A dual-core As2Se3-PMMA taper with a core diameter of 0.6 µm detects acoustic waves in the frequency range from 10 kHz to 34 MHz, which are excited by three piezoelectric transducers with optimal operating frequencies of 100 kHz, 3.65 MHz, and 6.8 MHz, respectively.
Highlights
Ultrasound detection plays a significant role in many applications, such as structural health monitoring and biomedical imaging
The principle for ultrasound detection based on a dual-core As2Se3PMMA taper is introduced, which shows that the dual-core structure enables high-sensitivity detection for shear waves and the low Young’s modulus enhances the sensitivity for longitudinal waves
An external-cavity laser (ECL) is used as a laser source with an output power of 0 dBm whose wavelength is tuned by a thermal control to the quadrature point of the spectral slope of the transmission spectrum of the dual-core taper
Summary
Ultrasound detection plays a significant role in many applications, such as structural health monitoring and biomedical imaging. Tapered dual-core As2Se3-PMMA fibers composed of two As2Se3 cores in the center and a surrounding polymethyl methacrylate (PMMA) cladding are promising platforms for sensing applications. The PMMA cladding provides high flexibility, robustness, and lower Young’s modulus that enhances sensitivity for strain, stress, and acoustic wave detection.. Simultaneous temperature and strain measurements have been achieved based on dual-core As2Se3PMMA tapers.. A 1 cm-long dual-core As2Se3-PMMA fiber with an As2Se3 core diameter of 0.6 μm and a PMMA cladding diameter of 34 μm is fabricated and used for ultrasound detection. The principle for ultrasound detection based on a dual-core As2Se3PMMA taper is introduced, which shows that the dual-core structure enables high-sensitivity detection for shear waves and the low Young’s modulus enhances the sensitivity for longitudinal waves. Three PZTs with optimal operating frequencies of 100 kHz, 3.65 MHz, and 6.8 MHz are measured experimentally in order to test the frequency response of the fabricated dual-core As2Se3-PMMA ultrasound sensor
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