Microscopic Distribution Measurements of Microwave Frequency Magnetic Fields by Fiber-Edge Magneto-Optic (FEMO) Probing

摘要

To meet the increasing requirement for broadband magnetic field measurement techniques, we have proposed and demonstrated the scheme of fiber-edge magneto-optic (FEMO) probing. This paper briefly explains principle of the scheme, and reviews its recent progresses in the authors' laboratory as regards its three-dimensional spatial resolution and high-frequency response. We have experimentally confirmed that its three-dimensional spatial resolution can be reduced to the 10-mum scale, mainly through miniaturization of the magneto-optic crystal, and have enabled the first x-z mapping of microscopic magnetic field distribution over fine electrical circuits of the 100-mum scale or below. We have also experimentally shown that its bandwidth in the frequency response can be extended beyond 10 GHz with a fairly high flatness by means of rotation magnetization detection through the Faraday effect.