Figure 3

FDTD simulated electric field distribution of Au NPs/nanogap/Au NPs with various gap sizes: (a) 20, (b) 10, (c) 5, and (d) 2 nm.
FDTD simulated electric field distribution of Au NPs/nanogap/Au NPs with various gap sizes: (a) 20, (b) 10, (c) 5, and (d) 2 nm.