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. 2015 Mar 10;5:8901. doi: 10.1038/srep08901

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The electric field distribution at the interface between the periodical arrays and the substrate for f = 1.265 THz (a), f = 1.688 THz (b) and f = 2.135 THz (c), respectively. The inset in (c) is the electric field distribution at y = 38 μm.