About optical coupling properties of 2D plasmonic nanostructures

In this work we examine the properties of surface plasmon polaritons that are being formed in a 2D periodic array of nanoholes etched in gold/chromium layer upon a glass substrate. We apply very simple and accurate photo-acoustic technique to measure the absorption of the periodic structure. The experimental results are in a good agreement with the simulations. In order to better understand the confinement of electrical field and the existence of SPPs in the sample, we proceed with Raman spectroscopy measurements. The ability to control and tailor the optical response of structures like these could lead to high performance optical and plasmonic circuits.