Table 3.

Surface enhancement by dimer nanoantennas: Si vs. Au.

Dimers	t (nm)	r (nm)	g (nm)	Wavelength (nm)	SEF factor	SERS factor
Si [63] (Fig. 3c)	200	110	20	860	1900	1000
Si [64] (Fig. 3d)	150	100	20	700	470	1720
Au [63] (Fig. 3c)	40	70	20	860	NA	30000
Au [65] (Fig. 3e)	NA	40	6	705	600	NA