Open AccessOptical near field in nanometallic slits
Author(s) -
PeiKuen Wei,
HongShiue Chou,
Wunshain Fann
Publication year - 2002
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.10.001418
Subject(s) - optics , near field scanning optical microscope , surface plasmon , transmittance , near and far field , near field optics , surface plasmon polariton , materials science , field (mathematics) , optical microscope , optical field , polarization (electrochemistry) , physical optics , plasmon , physics , electric field , scanning electron microscope , chemistry , mathematics , quantum mechanics , pure mathematics
The propagation and the distribution of the optical near field in nanometallic slits are measured by a near-field scanning optical microscope. The optical near field for the p-polarized wave is confined to the middle of the slit. In contrast, the near field for the s-polarized wave is located at the edges. Asimulation by the finite-difference time-domain method verifies that the near-field distribution for the s-polarized wave is due to the propagation of the surface plasmon wave (SPW) at the air-metal surface. The existence of the SPW also accounts for the extraordinary transmittance of s-polarized light, which is one order of magnitude larger than that of p-polarized light.