Bifacial Metasurface with Quadrupole Optical Response

Loading...
Thumbnail Image
Access rights
openAccess
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2015-08
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
1-6
Series
PHYSICAL REVIEW APPLIED, Volume 4, issue 2
Abstract
We design, fabricate, and characterize a metasurface, whose multipole optical response depends significantly on the illumination direction. The metasurface is composed of gold-nanodisc dimers embedded in glass. In spite of their nanoscale size, the dimers exhibit a dominating electric-current-quadrupole response in a wide range of wavelengths around 700 nm when illuminated from one side, and a primarily electric-dipole response when illuminated from the opposite side. This leads to two consequences. First, the reflection coefficient of the metasurface considerably differs for the two sides of illumination. Second, quadrupole excitation results in a significant local enhancement of both electric and magnetic fields around the dimers. Our experimental spectroscopic data are in good agreement with simulations obtained using a multipole expansion model.
Description
Keywords
asymmetric reflectivity, electromagnetic multipoles, optical metasurface
Other note
Citation
Shevchenko, A, Kivijärvi, V, Grahn, P, Kaivola, M & Lindfors, K 2015, ' Bifacial Metasurface with Quadrupole Optical Response ', Physical Review Applied, vol. 4, no. 2, 024019, pp. 1-6 . https://doi.org/10.1103/PhysRevApplied.4.024019