838191.fig.004a
(a)
838191.fig.004b
(b)
838191.fig.004c
(c)
Figure 4: (a) The transmission spectra of periodic arrays with different gaps. (b) -field enhancement factor on the top surface of nanodisks along plane for periodic hexagonal arrays with different gaps illuminated at three laser wavelengths (488 nm, 532 nm, 632.8 nm). (c) -field enhancement factor at the top of nanodisks along plane for periodic hexagonal arrays with different gaps illuminated at their own resonance wavelengths. The diameter of the nanodisks is fixed at 100 nm.