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 (Nsk ≈±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

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Komal’s SHG phase-matching paper published in Advanced Optical Materials

We experimentally phase-matched the second-harmonic generation (SHG) between two orthogonal modes. Accurate design of plasmonic two-wire transmission-line (TWTL) greatly raised the conversion efficiency to 0.021% and simultaneously extended the operational length to 18 um. A multi-stage device is capable of performing polarization-dependent switching between the linear propagation of SHG and frequency up-conversion in the later stages. We further realize a nonlinear OR logic operation.

https://doi.org/10.1002/adom.202503409

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