Metasurfaces can be used for free-space wavefront shaping, which can generate an arbitrary phase shift with subwavelength thickness. We designed an integrated metasurface that can achieve on-chip spatial signal convertion with a ultracompact dimension and low loss (<1dB). The dielectric metalens integration can significantly reduce the taper length as well as making mechanically robust photonic crystal coupler with high transmission. The proposed integrated metasurfaces can be easily cascaded to achieve on-chip meta-system for signal processing. Here we demonstrated a metasystem that can perform the spatial differentiation and a deep learning meta-system that can achieve wavelength demultiplexing.
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