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

Figure 5

Scanning electron micrograph (SEM) of the master mold used for the fabrication of nanoplasmonic device. The master mold is fabricated on a glass substrate using laser interference lithography technique [91, 92] with a range of different heights; (top left), (top right), top view (bottom left), and 30° tilted view (bottom right) [46].