Resistances of devices or samples of material can be measured accurately by placing the sample between conducting plates attached to an electrooptic crystal. The plates are then charged, and the voltage-induced birefringence in the crystal is monitored optically. In this way very small conduction currents in the sample can be monitored without introducing an additional current path between the electrodes. Resistances up to 1016 Ω have been measured using LiNbO3 as the electrooptic crystal.
© 1980 Optical Society of America
G. A. Massey, N. G. Eror, and G. W. Nelson, "Measurement of very high resistivities using electrooptic crystals," Appl. Opt. 19, 1282-1284 (1980)