Optical devices have the potential for large scale integration and can be successfully used in mission critical
environments; in particular optical probes interacting with electric fields can be used in several electromagnetic
compatibility (EMC) and industrial, scientifical and medical (ISM) applications. We describe an electro-optical device
based on a LiNbO3 Mach-Zehnder integrated interferometer which has, with respect to standard metallic probes, a very
reduced coupling effect on the electromagnetic field to be measured. The probe is mainly made by non conductive
materials, making such device suitable for experimental measurement of electromagnetic fields in near field region (or
Fresnel's one) of transmitting antennas or in their reactive zone. Here no simple theory is available in order to evaluate
the fields and mutual coupling between antennas and standard probes strongly affect the measurements: the optical probe
avoids the coupling of the fields with metallic structures and the loss of antenna calibration which typically yield
measurement errors. The probe has been tested in the ELF and VHF bands as shown in the Figures below. The device
characterization is discussed and its performance is optimised by an electro-optical device mathematic model.
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