Table 1. Experimental and theoretical steady state efficiency of SP-NRET.

Structure		Stratified/Single layer thickness (nm)	SP-NRET efficiency (%) (Experimental)	SP-NRET efficiency (%) (Theoretical)
Stratified	= 20 nm	50	18.15 ± 1.03	24.69
		60	21.74 ± 0.75	27.81
		70	18.64 ± 0.74	25.58
		80	17.27 ± 0.91	23.11
	= 30 nm	70	19.06 ± 0.78	25.54
		80	22.38 ± 1.20	27.96
		90	26.46 ± 1.87	29.71
		100	25.59 ± 1.14	24.56
Single layer		40	15.46 ± 0.80	20.07
		60	14.68 ± 1.41	17.66
		90	8.55 ± 0.95	10.56

The stratified layer thickness in stratified structure equals to; e.g. in the stratified structure with the plasmonic layer thickness of 70 nm and  = 20 nm, the spacer layer thickness is  = 30 nm. The plasmonic layer thickness in single layer sample equals to d_m. The errors on fitting parameters in steady state efficiency of SP-NRET are estimated to be approximately 8%.