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(a) TEM image illustrating the gold nanorods with a 57-nm length and 25-nm width on average. (b) The extinction spectra of gold nanorods on the sapphire substrate and the PL spectra of the MoS2 monolayer grown on the sapphire substrate. (c) Calculated near-field optical intensity map of a gold nanorod with a length of 57 nm and width of 25 nm laying on the sapphire substrate.
