Theoretical model for angular grating-based integrated optical vortex beam emitters

Jiangbo Zhu*, Xinlun Cai, Yujie Chen, Siyuan Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)
6 Downloads (Pure)

Abstract

We develop a theoretical model for the recently reported integrated optical vortex beam emitters that incorporate angular gratings in microring resonators. Using azimuthally polarized dipole oscillators to represent emissions scattered from the grating elements that are located along the inner wall of the ring waveguide, we obtain expressions for far-field components under the paraxial approximation. The results show that the emission is of the form of cylindrical vector Bessel beams with exactly defined optical orbital angular momentum, and can have azimuthal, radial, and longitudinal field components after propagation. The calculation results for field distributions in both near and far zone agree well with the experimental results.

Original languageEnglish
Pages (from-to)1343-1345
Number of pages3
JournalOptics Letters
Volume38
Issue number8
DOIs
Publication statusPublished - 15 Apr 2013
Externally publishedYes

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