Recent Progress in Photocatalytic Functions of Organic Hybridized Nanocrystals

Photonics is a branch of science that studies how the light propagatesthrough the material and how to modify its propagation, such as how to prevent thepropagation or to localize the light, which can be useful to amplify the electric field. Toachieve this, one can use a system containing N layers of varying dielectric media inone dimension, which is called multilayer dielectric stacks. By manipulating thesequence of dielectric media within the multilayer system, one can control the lightpropagation through it. In this work, we will show that the number of lighttransmission probability (T) values for the N layers is not arbitrary, instead there areeither (N/2 + 1) or (N + 1) discrete values of T for even or odd number N, respectively.This high degeneracy implies the existence of hidden symmetries within the multilayer,which we will explain in this work [1]. We then apply the multilayer system forcalculating the absorption of light in undoped graphene suspended inside the speciallydesigned multi-layer structure. We found that the absorption is enhanced up to 50%,which is much larger than conventional 2.3% graphene absorption without the multi-layer structure. We believe that the enhancement of absorption is due to theenhancement effect of electric field by interference occurring inside the multi-layerstructure. We will show that the absorption depends on the number of layer and alsothe ratio of refractive indices of the dielectric media of the structure. Technical terms1. Graphene: atomic layer material consisting of carbon atom arranged inhoneycomb like structure.2. Degeneracy: two or more objects having the same property. Reference[1] J. Phys.: Condens. Matter 29 455303P17