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(A) Measurement conditions for silver and gold dimers and number of scans before any amorphous carbon (AC) background was observed. λ—irradiation wavelength, I—irradiation power density, H—irradiation energy density. (B) Maximal electromagnetic field intensity enhancement of 60 nm gold and silver dimers with a gap of 3 nm, determined by FDTD simulations including the DNA coating and a silicon surface with a 2 nm silicon oxide layer.
