Monitoring of Film Qualities of Amorphous SiO2 films/Si(100) Substrates by Measuring Bulk and Surface Acoustic Waves in Terms of Brillouin Spectroscopy

Hong, J. T.; Lee, Byoung Wan; Oh, Sang‐Ha; Ko, Jae‐Hyeon; Lee, Hunyong; Chulhwa, Lee; Kim, Doosung

doi:10.3938/jkps.73.960

Cited by 1 publication

(1 citation statement)

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“…Moreover, the SAW BS can be controlled or enhanced by smallcore and high air-filling fraction microstructured fibers [28] and the photo-elastic and moving-boundary effects, [29] and eliminated for one polarization mode at certain core ellipticities. [30] The SAW and HAW BS have been applied to characterize of subwavelength-diameter tapered silica optical fibers, [31] ob-tain the values of the elastic constants [32][33][34] and optical sensing and detection. [35][36][37] In this paper, we demonstrate the temperature and strain sensitivities of SAW and HAW BS in optical microfibers, which is potential for new-type Brillouin fiber-optic sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Temperature and strain sensitivities of surface and hybrid acoustic wave Brillouin scattering in optical microfibers

Liu¹,

Gu²,

Ning³

et al. 2022

Chinese Phys. B

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Temperature and strain sensitivities of surface acoustic wave (SAW) and hybrid acoustic wave (HAW) Brillouin scattering (BS) in 1-1.3 μm diameter optical microfibers are simulated. In contrast to stimulated Brillouin scattering (SBS) from bulk acoustic wave in standard optical fiber, SAW and HAW BS, due to SAWs and HAWs induced by the coupling of longitudinal and shear waves and propagating along the surface and core of microfiber respectively, facilitate innovative detection in optical microfibers sensing. The highest temperature and strain sensitivities of the hybrid acoustic modes (HAMs) are 1.082 MHz/℃ and 0.0289 MHz/µε, respectively, which is suitable for microfiber sensing application of high temperature and strain resolutions. Meanwhile, the temperature and strain sensitivities of the SAMs are less affected by fiber diameter changes, ranging from 0.05 to 0.25 MHz/℃/µm and 0.0001 to 0.0005 MHz/µε/µm, respectively. It can be found that that SAW BS for temperature and strain sensing would put less stress on manufacturing constraints for optical microfibers. Besides, the simultaneous sensing of temperature and strain can be realized by SAW and HAW BS, with temperature and strain errors as low as 0.30-0.34 ℃ and 14.47-16.25 µε.

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