1. High sensitivity magnetic field sensing method based on magneto-photonic crystal slow light Sagnac interferometers
- Author
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Yue-yu Xiao, Jinkui Yan Jinkui Yan, Zhidong Shi, Lei Peng, and Yi-Wei Gao
- Subjects
Materials science ,business.industry ,Physics::Optics ,Slow light ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Magnetic field ,Crystal ,Interferometry ,Optics ,Astronomical interferometer ,Chirp ,Physics::Atomic Physics ,Sensitivity (control systems) ,Electrical and Electronic Engineering ,business ,Photonic crystal - Abstract
The magnetic field sensing properties based on the slow light effect of magneto-photonic crystals are studied. The nonreciprocal slow light effect of the magneto-photonic crystal immersed into an applied magnetic field is deduced by the scattering matrix method. A Sagnac interferometer is designed to enhance the sensitivity coefficient to the magnetic field and suppress the influences of reciprocal disturbances. Numerical results show that the sensitivity coefficient of a MPC slow light sensor is about 50 times that of the sensor made of bulk magneto-optic material with the same thickness. The influences of structural parameters of the magneto-photonic crystal, such as the number of periods, the duty ratio and the chirp, on the sensitivity coefficient are discussed.
- Published
- 2015
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