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Light manipulations such as spin-direction locking propagation, robusttransport, quantum teleportation and reconfigurable electromagnetic pathwayshave been investigated at the boundaries of photonic systems. Recently bybreaking Dirac cones in time-reversal invariant photonic crystals,valley-pseudospin coupled edge states have been employed to realize selectivepropagation of light. Here, without photonic boundaries, we realize thepropagation of pseudospin states in three-dimensional bulk metacrystalwaveguides by employing the ubiquitous valley degree of freedom.Valley-dependent pseudospin bands are achieved in three-dimensional metacrystalwaveguides without Dirac cones. Reconfigurable photonic valley Hall effect isproposed after studying the variation of pseudospin states near K' and Kvalleys. Moreover, a prototype of photonic blocker is realized by cascading twoinversion asymmetric metacrystal waveguides in which the pseudospin directionlocking propagation exists. In addition, valley-dependent pseudospin bands arealso discussed in a realistic metamaterials sample. These results show analternative way towards molding the pseudospin flow in photonic systems.

Valley controlled propagation of pseudospin states in bulk metacrystal waveguides