2 results about "Effective refractive index" patented technology

The invention discloses a magnetothermal effect-based magnetic field measurement method. The method is mainly characterized in that magnetic energy is absorbed in an alternating magnetic field to generate heat by using ferroferric oxide nanoparticles, and the total effective refractive index of a waveguide is changed, so that an output resonance peak of a magnetothermal effect-based silicon micro-ring magnetic field sensor shifts to achieve magnetic field measurement. The method has the advantage that the magnetic field measurement range is improved. Meanwhile, the invention provides a magnetic field sensor based on the method; the size of a traditional magnetic field sensor is reduced by using the advantages of a high quality factor of the magnetic field sensor and the magnetothermal effect of the magnetic nanoparticles; a solid foundation is laid for integration, intelligentization and miniaturization of the magnetic field sensor; meanwhile, the structure is simple; the sensitivity of the sensor can be changed through optimizing the size design of the sensor and the properties of the magnetic nanoparticles; and the magnetic field sensor is flexibly applicable to various scenarios. Meanwhile, the invention provides a magnetic field sensor-based preparation method, and the preparation method has the advantage that the manufacturing efficiency is improved.