Open AccessControllable design of super-oscillatory planar lenses for sub-diffraction-limit optical needles
Author(s) -
Jinshuai Diao,
Weizheng Yuan,
Yiting Yu,
Yanyan Zhu,
Yan Wu
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.001924
Subject(s) - diffraction , optics , limit (mathematics) , planar , numerical aperture , diffraction efficiency , focus (optics) , interference (communication) , focal length , materials science , computer science , lens (geology) , physics , mathematics , telecommunications , wavelength , mathematical analysis , channel (broadcasting) , computer graphics (images)
Sub-diffraction-limit optical needle can be created by a binary amplitude mask through tailoring the interference of diffraction beams. In this paper, a controllable design of super-oscillatory planar lenses to create sub-diffraction-limit optical needles with the tunable focal length and depth of focus (DOF) is presented. As a high-quality optical needle is influenced by various factors, we first propose a multi-objective and multi-constraint optimization model compromising all the main factors to achieve a needle with the prescribed characteristics. The optimizing procedure is self-designed using the Matlab programming language based on the genetic algorithm (GA) and fast Hankel transform algorithm. Numerical simulations show that the optical needles' properties can be controlled accurately. The optimized results are further validated by the theoretical calculation with the Rayleigh-Sommerfeld integral. The sub-diffraction-limit optical needles can be used in wide fields such as optical nanofabrication, super-resolution imaging, particle acceleration and high-density optical data storage.