- We studied coupling between the fundamental mode of a rectangular plasmonic waveguide providing an ENZ medium at its cutoff wavelength and the localized plasmon resonance of a gold nanorod located at the center of the waveguide.
- This coupling phenomenon provides a powerful method to control the resonance modes supported by waveguides, where, otherwise, the only way to tune the cutoff wavelength is to change the dimensions or materials.
- Employing a plasmonic nanostructure simply brings further control over the optical response, enabling two instead of one ENZ region as well as further degrees of freedom, i.e., the dimension, shape, and material of the plasmonic nanostructure.
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