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

Figure 13

Schematic representative of the optical response of nanohole array sensor to refractive index change. (a) The change in the wavelength of maximum transmission intensity, also known as peak wavelength shift, can be quantified when comparing the transmission spectrum of nanohole array sensor exposed water (refractive index = 1.33) (solid) and water with glucose added (refractive index = 1.34) (dashed). (b) Integrated sensor response can be obtained from integrating the area under the transmission spectrum over a defined range of wavelengths (e.g., to ). (c) Intensity variations at a single wavelength from the transmission spectrum (inset) can also be monitored in response to changes in the refractive index on the nanohole array sensor.

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