Fig. 1. (Color online) Measurement system of TEOIM: A microwave signal generated by a signal generator was amplified to 30 dBm by an amplifier, and the amplified signal was transmitted to a TE-mode open-ended waveguide antenna. The waveguide antenna emitted microwaves to the device under test (DUT). The optical system consisted of a light source (wavelength: 530 nm), circular and linear polarizers, an optical indicator, a zoom lens, and a CCD camera. The probing light from the light source was first converted into left-circular polarization by the circular polarizer. The polarized light then passed through the optical indicator, reflected, and was further filtered through the linear polarizer. Finally, the intensity of the transmitted light was captured by the CCD camera.
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