A high-sensitivity photonic micro sensor was developed for electric field detection. The sensor exploits the optical modes of a dielectric sphere. Changes in the external electric field perturb the sphere morphology leading to shifts in its optical modes. The electric field strength is measured by monitoring these optical shifts.
Ioppolo, T., Ötügen, V., Ayaz, U. Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors. J. Vis. Exp. (71), e50199, doi:10.3791/50199 (2013).