Vector beams in planar photonic crystal cavities with rotating air holes

Xiaomei Gao, Lechen Yang, Fang Bo, Jiafang Li*, Guoquan Zhang, Jingjun Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We report a method to generate angularly polarized vector beams with a topological charge of one by rotating air holes to form two-dimensional photonic crystal (PC) cavities. The mode volume and resonance wavelength of these cavities are tuned from 0.33(λ/n)3 to 12(λ/n)3 and in a wide range of 400 nm, respectively, by controlling the range of fixed air holes near the center of the structure. As a benefit, the half-maximum divergence angles of the vector beam can be widely changed from 90 to ∼ 60. By adjusting the shift direction of the air holes in the PC cavities, optical vector beams with different far-field morphology are obtained. The scheme provides not only an alternative method to generate optical vector beams, but also an effective strategy to control far-field morphology and polarizations, which holds promising applications such as optical microscopy and micro-manipulation.

Original languageEnglish
Pages (from-to)1587-1590
Number of pages4
JournalOptics Letters
Volume45
Issue number6
DOIs
Publication statusPublished - 15 Mar 2020

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