
Vector beams in planar photonic crystal cavities with rotating air holes
Author(s) -
Xiaomei Gao,
Lechen Yang,
Bo Fang,
Jiafang Li,
Guoquan Zhang,
Jingjun Xu
Publication year - 2020
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.381458
Subject(s) - algorithm , materials science , computer science
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}{(\lambda /n)^3}$0.33(λ/n) 3 to ${12}{(\lambda /n)^3}$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 $\sim{60}^\circ $∼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.