Anand’s meron tube work published in Physical Review Letters

We demonstrate the first photonic spin-meron tube lattice in free space using spin-angular momentum vectors. Non-paraxial spin–orbit coupling forms finite-length meron tubes (N_sk ≈±1/2), whose length is dependent on diffractive element dimensions. We also show that C₃ geometry of triangular block yields spin-skyrmion tube while effective Moir´e bilayer results in spin-twistronics in free space without the need of strong near field confinement.

https://doi.org/10.1103/rsyn-vysg