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In this activity we propose an integrated optical electromagnetic field sensor suitable for sensing in the Fresnel region over a wide frequency range (ELF to UHF band). The optical electromagnetic field sensor  is based on an integrated optical LiNbO3 interferometer driven by fiber transmission lines, therefore is mainly made by dielectric materials. This device, differently from standard metallic probes, yields minimal coupling with critical radiating structures, and enables their near-field monitoring in industrial, scientific and medical applications. It could also be implemented in future by a polymer and metamaterial based interferometer.

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