| References | Structures | Refractive index | Wavelength | Direction of pump |
| [1] | Paired nanorods | −0.3 | 1.5 µm | Perpendicular |
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| [23] | Nano-fishnet with circular rods | −2 | 2.0 µm | Perpendicular |
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| [4] | Nano-fishnet with rectangular rods | −1 | 1.4 µm | Perpendicular |
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| [24] | Metal-dielectric-metal | −1.05 | 780 nm | Perpendicular |
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| [25] | Multishell nanowires | −2.0 | 690 nm | Perpendicular |
| Our design [26] | Cascaded split ring resonators | −2.8 | 1.5 µm | Horizontally |