Abstract
We present a Babinet-inverted optical nanoantenna integrated with a plasmonic waveguide. Using an integrated nanoantenna, we can couple the plasmon guide mode in a metal-insulator-metal (MIM) structure into the resonant antenna feed directly. The resonantly excited feed slot then radiates to free space and generates a magnetic dipole-like far-field pattern. The coupling efficiency of the integrated nanoantenna is calculated as being approximately 19% using a three-dimensional finite-difference time-domain (3D FDTD) simulation. By adding an auxiliary groove structure along with the feed, the radiation direction can be controlled similar to an optical Yagi-Uda antenna. We also determine, both theoretically and experimentally, that groove depth plays a significant role to function groove structure as a reflector or a director. The demonstrated Babinet-inverted optical nanoantenna integrated with a plasmonic waveguide can be used as a “plasmonic via” in plasmonic nanocircuits.
Highlights
Direction of resonant light, like the rod-type Yagi-Uda nanoantenna
We experimentally demonstrate that the plasmon guide mode of the MIM structure is coupled to a magnetic dipole (Babinet-inverted) feed, depending on the slot direction at the resonant frequency, and radiates to free space in a dipole-like pattern
The structure of MIM plasmonic guide is made of silver(Ag)-poly(methyl methacrylate)(PMMA)-Ag materials
Summary
Direction of resonant light, like the rod-type Yagi-Uda nanoantenna. In the case of the Babinet-inverted nanoantenna, all components are made on a metallic film. We experimentally demonstrate that the plasmon guide mode of the MIM structure is coupled to a magnetic dipole (Babinet-inverted) feed, depending on the slot direction at the resonant frequency, and radiates to free space in a dipole-like pattern. A Babinet-inverted antenna has a role of coupling lateral guiding mode to vertical radiation, and plasmonic connection between physical layers in 3D photonic circuits that goes through the plane of one or more adjacent layers. It is an exact counterpart of the “electrical via” in electronic circuits
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