Open AccessPlasmonic focusing in spiral nanostructures under linearly polarized illumination
Author(s) -
Jie Li,
Yang Chao-Jie,
Hongquan Zhao,
Feng Lin,
Xing Zhu
Publication year - 2014
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.22.016686
Subject(s) - optics , plasmonic lens , plasmon , polarization (electrochemistry) , linear polarization , physics , spiral (railway) , lens (geology) , ray , finite difference time domain method , wavelength , surface plasmon , materials science , surface plasmon polariton , laser , mathematical analysis , chemistry , mathematics
We have investigated the focusing properties of nanostructured plasmonic spiral lens by using linearly polarized illumination, and analysed its field enhancement effect based on the phase matching theory and finite-difference time-domain simulation. We demonstrate that under linearly polarized illumination, spiral plasmonic lens shows focusing property regardless its polarization directions, and the focal spot is about 250nm when the incident wavelength is 671nm. The intensity of the focal spot could also be controlled by altering the radius, the number of turns and the width of the nanostructured spiral slot which are confirmed by finite-difference time-domain simulation.