Study on the low frequency magnetic detection sensitivity of cavity optomechanical magnetometer

Tiedong Xu; Hang Ping; Xiangyan Kong

doi:10.1117/12.2691240

28 July 2023 Study on the low frequency magnetic detection sensitivity of cavity optomechanical magnetometer

Tiedong Xu, Hang Ping, Xiangyan Kong

Proceedings Volume 12753, Second Conference on Biomedical Photonics and Cross-Fusion (BPC 2023); 1275306 (2023) https://doi.org/10.1117/12.2691240
Event: Second Conference on Biomedical Photonics and Cross-Fusion (BPC 2023), 2023, Shanghai, China

Abstract

The whispering gallery mode ( WGM ) microcavity is a widely used microresonator. With its ultra-high quality factor Q ( above 10⁹ ) and small mode volume ( µm³ ) , it can amplify the interaction between substances. The giant magnetostrictive material Terfenol-D is a rare earth material that can respond to changes in the magnetic field. With its ultra-high magnetostrictive coefficient ( 1500∼2000 ppm ), ultra-fast response speed( less than 1 µs ), and efficient energy conversion efficiency ( about 50% ), it is widely used in magnetic field sensors. Therefore, a high-sensitivity cavity optomechanical magnetometer can be designed and manufactured by combining the WGM and Terfenol-D. By analyzing the inherent characteristic frequency and magnetostrictive material characteristics of the cavity optomechanical magnetometer, the sensitivity of the magnetometer in magnetic field detection is greatly improved by mixing the bias magnetic field with the excitation magnetic field. In our simulation, compared with the environment without bias magnetic field, the deformation of the cavity optomechanical magnetometer is about 10⁶ times higher of the original after adding the bias magnetic field, which will greatly enhance the detection sensitivity of the excitation magnetic field and provide an effective method for detecting biomagnetic signals.

Citation Download Citation

Tiedong Xu, Hang Ping, and Xiangyan Kong "Study on the low frequency magnetic detection sensitivity of cavity optomechanical magnetometer", Proc. SPIE 12753, Second Conference on Biomedical Photonics and Cross-Fusion (BPC 2023), 1275306 (28 July 2023); https://doi.org/10.1117/12.2691240

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