Near-field Moiré effect mediated by surface plasmon polariton excitation.
We have demonstrated a surface plasmon polariton mediated optical Moiré effect by inserting a silver slab between two subwavelength gratings. Enhancement of the evanescent fields by the surface plasmon excitations on the silver slab leads to a remarkable contrast improvement in the Moiré fringes from two subwavelength gratings. Numerical calculations, which agree very well with the experimental observation of evanescent-wave Moiré fringes, elucidate the crucial role of the surface plasmon polaritons. The near-field Moiré effect has potential applications to extend the existing Moiré techniques to subwavelength characterization of nanostructures.
Liu
Zhaowei
Z
NSF Nano-scale Science and Engineering Center, University of California, Berkeley, 94720-1740, USA. Zhaowei@berdeley.edu
Durant
Stéphane
S
Lee
Hyesog
H
Xiong
Yi
Y
Pikus
Yuri
Y
Sun
Cheng
C
Zhang
Xiang
X