Table 1.

Data from experimental transmission spectra for arrays of holes in air for different periods, film thickness and hole diameter. Λ: periodicity; T: thickness; D: diameter; ${\lambda }_u$: upper-metal resonance peak; ${\lambda }_s$: metal-substrate resonance peak.

Λ (nm)	T (nm)	D (nm)	λu	λs
			(nm)	(nm)
575	60	230	601	1027
675	60	250	670	1178
675	60	280	679	1186
675	85	280	662	1166
675	130	280	645	1154
675	180	280	645	1154
575	60	155	605	1015
575	60	230	601	1027
575	60	290	594	1050