Table 5.

Summary of various nanostructured and localised plasmonic sensors.

Material Description	Coating (nm)	Sensitivity dB or nm/RIU	Wavelength (nm)	Resolution RIU-1	Index Range	Reference
Single mode fibre Multilayers, surface metallic grating	Ag, 43.3 and Au 1.2 nm	4000	400–1000	5 × 10−5	1.33	[88]
Single mode fibre D-shaped Multilayered ordered nanowires	Ge, 48 and SiO2, 48 and Pt, 36	1 × 104	1260–1680	3.2 × 10−4	1.33–1.39	[89]
Multimode fibre, End-face nanospheres	Au, 35	2700	400–700	3.7 × 10−6	1.3–1.38	[90]
Single mode fibre Tilted FBG random nanowires	Ag, 20–50	175	1520–1610	1.6 × 10−5	1.33–1.365	[91]
Single mode fibre Tilted FBG random nanowires	Au, 50	651	1520–1600	1.5 × 10−5	1.330–1.347	[92]
Single mode fibre D-shaped Multilayered ordered nanowires	Ge, 48 and SiO2, 48 and Ag, 32	1.2 × 104	1250–1680	1 × 10−6	1.3–1.39	[44]
Single mode fibre Tilted FBG nanowires	Ag, 30	1000	1520–1600	1 × 10−5	1.330–1.345	[93]
Single mode D-shaped etched to core fibre nanostrips	Au, 20	2 × 104	1400–1680	2.3 × 10−6	1.327–1.333	[94]
Single mode fibre bioconical taper, nanospheres	Au, 10.5	6000	400–1000	1 × 10−5	1.35	[95]
Multimode U-fibre, Triangular nanoparticles	Ag, 80–100	1116.8	300–600	9 × 10−6	1.334–1365	[96]