Table 1.

Design of samples 1–4.

	sample 1 [42]	sample 2 [42]	sample 3		sample 4
layer	material	material	material	thickness	material	thickness
1	Al2O3	Al2O3	Al2O3	20.4 nm	Al2O3	20.2 nm
2	Ag	Ag	Ag	188.2 nm	Ag	197.3 nm
3	SAO	SAO	Al2O3	5.2 nm	MgF2	29.6 nm
4		TiO2	SiO2	37.1 nm	Nb2O5	48.6 nm
5		SAO	Nb2O5	30.4 nm	MgF2	23.1 nm
6		TiO2	SiO2	80.2 nm	Nb2O5	30.5 nm
7			Nb2O5	11.8 nm