Coupling between a 1D-photonic crystal cavity and a
metallic nanostructure
Yohan Désières
CEA-LETI MINATEC,
17 avenue des martyrs, 38054 grenoble cedex 9
yohan.desieres@cea.fr
Metallic nanostructures are well known for their ability to confine light at the nanoscale. However, as
far as applications are concerned, a good coupling efficiency of such near field from usual far field
source is mandatory. To our knowledge, previous approach to reach highly efficient nanoscale
structure involved either metallic structures either dielectric structure. The first presents losses
whereas the second is unable to concentrate light into volume far below the diffraction limit.
Taking advantage of both worlds, we investigate the coupling between a photonic crystal cavity and a
metallic nanostructure. In this approach a high-Q 1D photonic crystal resonator is used as a lambda
scale photon reservoir. This reservoir is evanescently coupled to a metallic nanostructure supporting a
plasmonic resonance. In this paper properties and efficiencies of this coupling between the two kind
of resonators is investigated using FDTD method.
First 2D simulations are performed to understand the main physics. A PC resonator on a Si3N4
membrane and a gold cylinder are used as a basic model.
Secondly full 3D simulations are performed, optimizing both the cavity and the metallic
nanostructures to reach the highest field intensity around the metallic structure.
SiO2
Au
Si
Figure 1