Key points are not available for this paper at this time.
Structured light beams (SLBs) with spatially nonuniform phase or polarization distributions have attracted enormous interest in optical multiplexing communications due to the mutual orthogonality of orbital angular momentum (OAM) and vector modes. Here the experimental prototype for mode signal processing, all-dielectric Pancharatnam-Berry (P–B) phase-based metasurface (PBM), is demonstrated. The P–B phase involved with dispersion-free characteristics and spin–orbital interactions rewards the PBM, a naturally broadband working wavelength ranging from telecom C- to L-band and is capable of converting OAM and vector mode simultaneously. Moreover, the order of OAM and vector modes can be flexibly adjusted by designing the q-value of PBM. Based on these features, the all-optical processing (mode exchange, retrieving, and conversion) of both the multiplexed OAM- and vector-modes carrying 50 Gbit/s quadrature-phase shift-keying (QPSK) signals are successfully performed, and the bit error rates approach 1 × 10–6 for all the mode channels. It is anticipated that this all-dielectric PBM may open new avenues for all-optical information processing, optical interconnecting systems, and so on.
He et al. (Wed,) studied this question.