Open AccessFree-space coupling enhancement of micro-resonators via self-accelerating beams
Author(s) -
Xu Liu,
Yi Hu,
Pengbo Jia,
Ping Zhang,
Hao Wu,
Zhineng Hao,
Bo Fang,
Zhigang Chen,
Jingjun Xu
Publication year - 2018
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.032055
Subject(s) - optics , resonator , coupling (piping) , physics , whispering gallery wave , mode coupling , azimuth , radius , aperture (computer memory) , self focusing , coupling coefficient of resonators , coupled mode theory , materials science , refractive index , laser , laser beams , acoustics , computer security , computer science , metallurgy
We study free-space coupling of optical fields to the whispering-gallery-mode resonators by employing self-accelerating beams orbiting a semicircle. The best coupling condition is obtained through theoretical analysis, in accord with the numerical results. Comparing with the conventional Gaussian-like beams, much enhanced coupling efficiency is achieved with such self-accelerating beams, particularly when a large numerical aperture of an optical system is used or a higher-order azimuthal mode is considered. Conditions with slight deviation from the ideal radius of self-accelerating beams are further discussed, aiming to realize an optimized high coupling efficiency.