Interaction of Light with Plasmonic Nanostructures Fabricated by Nanosphere Lithography

摘要

Surface plasma oscillation is a well-known phenomenon responsible for the optical properties of the noble metal nanostructures. Fabrication of these noble metal plasmonic nanostructures in a large area is essential in various applications. In this work, we demonstrate the large-area fabrication of nano bow-tie structure of gold using nanosphere lithography. These structures function as optical nanoantennas that convert tree-space light to evanescently confined modes in the nanoscale below the diffraction limit due to which a field enhancement takes place. We present an application of these nanostructures as a low cost and reusable substrate for the detection of Rhodamine 6G (R6G).