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(Color online) (a) A three dimensional schematic view of a NHA with cavities beneath each nano-hole. (b) SEM image of a NHA revealing the cavities (FIB cutting performed in order to observe a cavity beneath each nano-hole).
(Color online) (a) Schematic of a conventional nano-hole (top) and a nano-hole with cavity (bottom). (b) Spatial distribution of the electric field intensity (log scale) within the nano-hole (xz side view) for a conventional nano-hole (top) and a nano-hole with a cavity (bottom).
(Color online) Optical transmission spectra for (a) a conventional NHA and (b) a NHA with cavities when liquids of 1.43, 1.49, and 1.55 refractive index were applied to the top surface. Each NHA had 135 nm circular hole size and 360 nm periodicity.
(Color online) (a) The ratio (η) of the (1,0) resonance peak to (1,0) Wood’s anomaly versus refractive index. (b) Sensitivity [nm/refractive index unit (RIU)] of the (1,0) resonance peak for NHAs of different periodicities. (c) Differential transmission intensity obtained for different refractive index liquids compared to a liquid with a refractive index of 1.58. Measurements were made at 632 nm for the conventional NHA and at 686 nm for the NHA with cavities.
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