Detailed spatial-spectral numerical characterization of axially symmetric broadband ultrasonic resonances in standard optical fibers

da Silva Ricardo E.; Webb David J.

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Detailed spatial-spectral numerical characterization of axially symmetric broadband ultrasonic resonances in standard optical fibers

机译：Detailed spatial-spectral numerical characterization of axially symmetric broadband ultrasonic resonances in standard optical fibers

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Standard single mode optical fibers (SMFs) have been widely employed to generate and measure ultrasonic signals in remarkable applications. In particular, optoacoustic fiber sensors provide unique features for micro -scale high resolution ultrasound imaging in biomedicine. However, at specific resonance frequencies, SMFs work as acoustic filters inducing relevant geometrical attenuation bands higher than 10 dB, which limit the sensors' sensitivity and frequency operation, causing image distortions and artifacts. We have numerically demonstrated high frequency axially symmetric ultrasonic resonances inside an optical fiber for the first time. The propagation of resonant axially symmetric acoustic modes along 1 cm fiber is investigated by means of 2D and 3D finite element techniques up to 80 MHz. The dispersion of the modes and induced beatlengths are characterized from the complex multimode interference with the 2D Fourier transform. The simulated spectra are validated with the renowned Pochhammer-Chree analytical equations. The frequency response of the acoustically induced strains in the fiber core is evaluated, and important acoustic parameters relevant for the modulation of phase, wavelength and power in optical fibers and diffractive gratings are derived and discussed. The results show that these res-onances are strongly dependent on the modal beatlengths. Solutions to improve the operation of fiber-based devices are proposed, pointing out new alternatives to advance broadband optoacoustic sensors and mono-lithic acousto-optic modulators.

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来源
《Optical fiber technology》 |2023年第1期|103192.1-103192.14|共14页
作者
da Silva Ricardo E.; Webb David J.;
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作者单位

Aston Univ;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Fiber-optic acoustic devices; Optoacoustic fiber sensors; Acousto-optic modulators; High frequency ultrasound; Numerical analysis; Finite element method;

Detailed spatial-spectral numerical characterization of axially symmetric broadband ultrasonic resonances in standard optical fibers

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