Researchers in South Korea and the Netherlands have demonstrated that the enhancement of the electric field of terahertz radiation inside a nano-slit continues to grow, even when the slit becomes narrower than the skin depth of the material.
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Martin-Moreno, L. Mind the gap. Nature Photon 3, 131–132 (2009). https://doi.org/10.1038/nphoton.2009.16
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DOI: https://doi.org/10.1038/nphoton.2009.16
