Table 1.

3D WDM results for different minimum feature sizes.

Feature size (d)	1300 nm efficiency FDFD/experiment*	1550 nm efficiency FDFD/experiment*	Curvature diameter	Gap size
80 nm	95.0%/79.0%	94.1%/59.0%	82.0 nm	81.7 nm
120 nm	71.9%/48.6%	72.4%/39.7%	124.2 nm	121.8 nm
160 nm	52.7%/27.4%	60.0%/39.8%	163.8 nm	161.1 nm

*Experimental results take a blue shift into account (Suppl. Information).