Phase, one of the remarkable freedoms of light, plays a critical role in optical information transmission and processing. A great number of methods for demodulating the phase of incident light have been reported recently. Here, we proposed an indirect method for demodulating the phase by using plasmonic metasurfaces. A linear relationship between the phase difference of incident light wave and the corresponding transmission spectra was obtained. The proposed method of phase demodulation has potential for a wide range of applications, such as on-chip information decoding, optical communication, optical imaging, and artificial intelligence, etc.
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