DETECTION METHOD FOR HIGH-FREQUENCY ELECTROMAGNETIC WAVES

摘要

PROBLEM TO BE SOLVED: To provide a detection method in which milliwave-band electromagnetic waves can be detected at room temperature with high sensitivity and at high speed over a wide frequency band when the electromagnetic waves are detected. SOLUTION: An EO crystal 4 is inserted into a waveguide 22, probe light 23 is made incident on the EO crystal into which high-frequency electromagnetic waves (millimeter waves 21) propagated inside the waveguide go, the probe light which has generated a polarization change according to the electric field amplitude of the high-frequency electromagnetic waves in the EO crystal is converted into intensity change light, and the probe light converted into the intensity change light is converted into an electrical signal by a photodetector 7.