Magnetic-field tuning whispering gallery mode based on hollow microbubble resonator with Terfenol-D-fixed
We propose a method of magnetic-field tuning whispering gallery modes (WGMs) based on a hollow microbubble resonator (HMBR) with Terfenol-D-fixed. WGMs are excited by the evanescent field from a tapered fiber coupling with an HMBR. Both ends of the HMBR are fixed with Terfenol-D and vary with differ...
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Published in | Applied optics. Optical technology and biomedical optics Vol. 58; no. 32; p. 8889 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
10.11.2019
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Online Access | Get more information |
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Summary: | We propose a method of magnetic-field tuning whispering gallery modes (WGMs) based on a hollow microbubble resonator (HMBR) with Terfenol-D-fixed. WGMs are excited by the evanescent field from a tapered fiber coupling with an HMBR. Both ends of the HMBR are fixed with Terfenol-D and vary with different lengths of the Terfenol-D. The length of the Terfenol-D varies with the external magnetic field for the high magnetostriction coefficient of Terfenol-D. The magnetic field sensitivity of 0.081 pm/mT in the magnetic field range of 0.14 mT-21.8 mT is achieved. The $Q$Q-factor of the HMBR can be regulated up to ${2.07} \times {{10}^4}$2.07×10
with physical stretching HMBR. This work provides a novel tuning whispering gallery mode scheme and a broad application prospect in the fields of optical measurement and precise optical clocks in the future. |
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ISSN: | 2155-3165 |
DOI: | 10.1364/AO.58.008889 |