| In this dissertation, the aim of my research is to study the optical properties, transmission and absorption, in a metallic film-dielectric substrate structure, which can be defined as an optical mesoscopic system.; For the metallic film-dielectric substrate structure under the irradiation of a visible laser beam with sufficient energy (this means that the incident light can transmit through the structure), the optical properties of such a structure, under certain circumstances, could not be explained only by the classical Maxwell's equations. This study shows that there is a quasi-two-dimensional thermal electron gas, which is generated by the incident laser irradiation and confined within a small region across the interface between the metal film and the dielectric substrate. The transport of the electrons at the interface dramatically influences the conductivity sigma of the local area, and, thus, affects the optical transmission and absorption of the structure because the optical properties of a medium are closely related to its sigma. Since electronic transport is of quantum behavior, thus the explanation of the optical properties of the structure should include some quantum descriptions, which is the reason that we call such a structure an optical mesoscopic system.; Two modified formulas for the transmission and the absorption of the optical mesoscopic system are derived in this dissertation, respectively. Experiments under different physical conditions were carried out. The results of the experiments agree with my theoretical predictions, and also match the computation results of the modified formulas. To my best knowledge, there is no similar work reported so far. |
