Abstract
We show anti-crossings due to strong in-plane coupling of grating excited propagating plasmon modes in dielectric-metal-dielectric structure with 2D dielectric pattern on top. Grating coupled propagating plasmon modes along with their complete dispersion in the measurement range and all different sample orientations are calculated first. Further a coupled mode theory is presented for the specific geometry presented here. Experimentally measured anti-crossing widths are compared with those calculated by coupled mode theory. It is shown that the coupling strength of the plasmon modes and thus the anti-crossing width can be controlled by the orientation of the sample.
Highlights
Coupled mode theory is well known for the orthogonal set of waveguide modes, gratings and other systems [17,18]
We show the experimental results on dispersion measurements which demonstrate anticrossing of plasmon modes and control of the splitting
When one of the modes locally modifies the dielectric constant this perturbation induces coupling between different orthogonal modes. In such a picture for the slab waveguide geometry for modes propagating along x-direction, the in-plane and out-of-plane coupling constants are well known
Summary
Coupled mode theory is well known for the orthogonal set of waveguide modes, gratings and other systems [17,18]. The structure of the paper is as follows, we will first briefly describe the sample and the measurement geometry. We quantitatively explain the splitting due to the coupling of plasmon modes followed by summary.
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