EO probe for simultaneous electric and magnetic near-field measurements using LiNbO3 with inverted domain

This paper presents a new type of optical probe for simultaneous measurements of electric and magnetic near fields with high accuracy up to the gigahertz range. Its probe head consists of a loop antenna element that is doubly loaded with LiNbO₃ electrooptic crystals. Using optical technology, it can work as a conventional double-loaded loop probe without metallic cables and electrical hybrid junction. We examined probe characteristics for electromagnetic field detection up to 20 GHz. We confirmed that the probe can measure electric and magnetic fields simultaneously with a high accuracy in the gigahertz range