Electric field sensor array from cavity resonance between optical D-fiber and multiple slab waveguides.

We develop an electric field sensor array based on optical fiber interrogation with electro-optic crystals to measure high energy electromagnetic pulses. D-shaped optical fiber provides the platform for resonant coupling with multiple electro-optic crystals, allowing an array of sensing points on a single strand of optical fiber. Because of its small size, flexibility, and dielectric composition, this sensor array is suitable for performing electric-field analysis at multiple points within an electronic device. Using lithium niobate and potassium titanyl phosphate crystals, the sensor array is sensitive to fields as low as 100 V/m.