Spin-to-orbital momentum conversion via electrooptic Pockels effect in crystals
Ihor Skab, Yurij Vasylkiv, Ihor Smaga, Rostyslav Vlokh
TL;DR
This paper demonstrates real-time conversion of spin angular momentum to orbital angular momentum in crystals using the Pockels effect, supported by both experimental and theoretical analysis.
Contribution
It introduces a method for SAM to OAM conversion in crystalline materials exploiting the Pockels effect, with specific crystal symmetry requirements.
Findings
Successful experimental demonstration in LiNbO3 crystals.
Theoretical and experimental results show high conversion efficiency.
Crystal symmetry influences the SAM to OAM conversion process.
Abstract
In the present work we have demonstrated a possibility for real-time operation by orbital an-gular momentum (OAM) of optical beams via Pockels effect in solid crystalline materials. Basing on the analysis of optical Fresnel ellipsoid perturbed by conically shaped electric field, we have shown that the point groups of crystals convenient for the conversion of spin angular momentum (SAM) to OAM should contain a three-fold symmetry axis or a six-fold inversion axis. The results of our experimental studies and theoretical simulations of the SAM-to-OAM conversion efficiency carried out for LiNbO3 crystals agree well with each other.
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