Magnetic field sensing system based on ferromagnetic thin film and Fabry-Perot cavity
A Fabry-Perot cavity and ferromagnetic thin film technology, applied in the optical field, can solve the problems of difficult technical realization and difficult frequency coincidence, and achieve the effect of overcoming the difficulty of ferromagnetic resonance frequency coincidence
Pending Publication Date: 2022-01-14
HANGZHOU DIANZI UNIV
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Problems solved by technology
Therefore, it is very difficult to match the frequency of the mechanical mode by tuning the ferromagnetic resonance frequency of the YIG microsphere cavity, and the ferromagnetic resonance frequency can be reduced to near the maximum frequency of the mechanical mode at most. It is difficult for the two frequencies to overlap. Through the triple resonance The way to improve the sensitivity of magnetic field sensing is limited by the design of the sensing unit in the system
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[0019] Such as figure 1 As shown, the magnetic field sensing system based on ferromagnetic film and Fabry-Perot cavity described in this embodiment includes a tunable laser 1, an optical attenuator 2, a polarization controller 3, a sensing unit 4, a photodetector 8, bias tee 9, beam splitter 10, spectrum analyzer 11, network analyzer 12, oscilloscope 13, servo controller 14, signal generator 15, current source 16, coil 17, wherein the sensing unit 4 includes FP cavity 5, YIG film 6, microstrip line 7.
[0020] The light output by the tunable laser 1 passes through the optical attenuator 2 and the polarization controller 3 sequentially, and then enters the FP cavity 5 . The light field propagates in the FP cavity 5 and drives the YIG thin film 6 to generate mechanical vibration, the light field output by the FP cavity 5 is sent to the photodetector 8, and the electrical signal output by the photodetector 8 is sent to the bias tee 9 to convert the alternating current The DC si...
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Abstract
The invention provides a magnetic field sensing system based on a ferromagnetic thin film and a Fabry-Perot cavity. The ferromagnetic thin film is a yttrium iron garnet thin film and is placed in the completely fixed Fabry-Perot cavity; a light field in the cavity can penetrate through the thin film in two directions; and when an external magnetic field signal exists, the response of the film to the magnetic field is reflected by the transmission characteristic of the cavity, and the magnetic field sensing system demodulated by using the transmission characteristic of the optical resonant cavity is obtained. By selecting structural parameters of the cavity and the thin film, a high-quality-factor optical mode and a high-frequency mechanical mode are obtained in a sensing unit formed by the ferromagnetic thin film and the Fabry-Perot cavity at the same time, and the ferromagnetic resonance frequency is tuned to be close to the mechanical mode frequency of the cavity through a direct-current magnetic field, so that resonance enhancement is achieved, and the sensing sensitivity of the alternating-current magnetic field is improved. Decoupling of a mechanical mode and an optical mode is achieved, so that it is possible to obtain a high optical quality factor and a high-frequency mechanical mode at the same time, and a new technical scheme is provided for high-frequency magnetic field detection.
Description
technical field [0001] The present invention relates to a magnetic field sensing system based on a ferromagnetic thin film and a Fabry Perot cavity, specifically a Fabry Perot (Fabry Perot, FP) cavity and a magnetic insulator yttrium iron garnet (Yttrium The magnetic field sensing structure formed by Iron Garnet (YIG) thin film belongs to the field of optics. Background technique [0002] Magnetic field sensors have the advantage of non-destructive detection and have a wide range of applications, playing an important role in digital economy, aerospace, industrial control, automatic driving, biomedical and other fields. The existing magnetic field sensing system based on optical resonant cavity is mainly composed of optical resonant cavity and magnetostrictive medium. By selecting the structural parameters of the whispering gallery mode optical resonant cavity, the maximum displacement field of the mechanical mode is more located in the optical mode. The transmission area, i...
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Login to View More IPC IPC(8): G01R33/032
CPCG01R33/0327Y02A90/30
Inventor 于长秋马世昌陈志远王晓旭燕玉明项晨晨金蒙豪周铁军
Owner HANGZHOU DIANZI UNIV