“…In the following 20 years, the theories [4], experiments and fabrications on NSOM developed time and time again. Its applications, including investigating films [5], polymers [6], DNA molecules [7], quantum dots [8], quantum wells [9], food molecules [10], waveguides [11–13], nanoparticles [14], gratings [15], and fabricating nanostructures [16] and nanostorage [17], are also getting wider and wider. In this article, we set up two kinds of different light paths in the NSOM system to investigate the ordinary silicon waveguides.…”