105-GHz Electric Field Visualization by Electro-Optic Imaging System Using Polarization Image Sensor

In this paper, we present a system designed for visualization of high-frequency electric field distributions at 105 GHz. Our approach employs an electro-optic crystal plate as the electric field probe, and the changes in the birefringence distribution induced by the electric field are measured through light. The detection system utilizes an optical system for high-sensitivity polarization imaging, which integrates a polarization image sensor with a uniform polarizer. This system converts the high-frequency electric field signal from the device-under-test into a frequency that the polarization image sensor can detect, employing the optical heterodyne method. The light source is generated by an optical modulator and a semiconductor optical amplifier, enabling the measurement of the 105-GHz electric field distribution with the image sensor. This system paves the way for advancements in next-generation wireless communications through precise high-frequency electric field measurements.