| SPPs | Surface plsmon polartions |
| MIM | Metal-insulator-metal |
| FEM | Finite element method |
| FOM | Figure of merit |
| PML | Perfectly matched layer |
| 3D | Three-dimensional |
| 2D | Two-dimensional |
| CMT | Coupled mode theory |
| TM0 | Fundamental transverse magnetic |
| FWHM | Full width at half-maximum |
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