Ultra-Sensitive Colorimetric Plasmonic Sensing and Microfluidics for Biofluid Diagnostics Using Nanohole Array

Table 1

Comparison of sensitivity of different plasmonic-based sensors.

Nanostructure	Wavelength (nm)	Structural dimensions (nm)	Characteristics	Sensitivity (nm/RIU)	RI range	Reference
Gold colloidal nanoparticles	450–600	d: 30	Shape-dependent LSPR	70.9	1.32–1.5	[80]
Arrays of gold nanodisk	500–1,000	p: 162, 340	Anisotropic property of gold nanodisk	167–327	1.32–1.42	[81]
Gold nanorods	800–1,000	AR-3.5 : 1; d: 80	Size-dependent LSPR	650	1.34–1.7	[82]
Nanocrescents	800–2,800	d: 410; : 10°; AR-4	Plasmon-induced electromagnetic near-field	879	Streptavidin binding	[83]
Gold nanorings	900–1,500	d: 150; : 20	Shape dependence on dielectric substrate	880	1.33–1.42	[84]
Nanocross and nanobar	1200–1,900	L: 380; W: 76; θ: 60°	Subradiant Fano resonances	710–1,000	1.333–1.38	[85]
Nanohole	450–950	d: 200; p: 500; t: 200 (Au)	EOT	481	1.33–1.36	[86]
Double-hole array	500–680	d: 200; C-C spacing: 190; p: 500–600; t: 100	EOT-LSPR	600	1–1.4	[76]
Silica sphere stripped nanowell	600–1000	d: 202–294; h: 297–340; p: 280–370; t: 60 (Au)	LSPR	1200–1600	1–1.6	[45]
Nano-Lycurgus cup array	300–1100	d: 170; h: 250–1000; p: 350 ± 30; t: 60–120 (Ag)	Mie scattering-LSPR-EOT	46000	1–1.56	[46]

d: diameter; h: height; p: period; t: thickness; W: width; L: length; a: length of the side of cube; AR: aspect ratio; C-C: center-to-center; EOT: extraordinary optical transmission; LSPR: localized surface Plasmon resonance.