Study On The Optical Properties Of Periodic Microstructures

Periodically structured films exhibit unique optical properties such as extraordinary optical transmission and negative refraction. They have potential applications and have become one of the hot optics in optics and materials science. The main work of this paper is to study the optical properties of the periodic structure. Three main steps:single/ multi-layer self-assembly of colloidal crystals, PDMS removing film and the metal/ dielectric film deposition,were used to fabricate large-scale periodically structured metal/dielectric films. This method can fabricate large-scale high-quality metal/dielectric films with submicrometer periodicity at low cost. The main contents of the thesis are described as follows:The combination of vertical convection self-assembly and coating technology, the surface of colloidal microspheres alternately depositing silver and silica, prepared alternately metal dielectric multilayer film microstructure cavity. Its transmittance curves is found a distinct transmittance peak in visible band. For multilayer metal dielectric film, with the increase of metal/dielectric film layers number, the transmission peak position moves to shorter wavelength in the visible band, It is a blue shift. Multilayer metal dielectric film and multilayer nano metal dielectric dot arry are complementary structure, compared with the previous studies and found that their transmission lines are peaks and valleys transmission. It is thought that babinet’s principle is not only to a complementary single-layer structure, a multilayer complementary structure is also applicable to the principle.Through self-assembly method, the experiment gets two-dimensional colloidal crystal of larger size’s microspheres on a glass substrate, Then to get PDMS containing two-dimensional colloidal crystal by spin coating, baking, removing film. The size of the microsphere sample prepared in the experiment is 4.87μm, The study is main to Talbot effect of the lagerer size.Combined the microspheres with multilayer metal/dielectric films alternately, we study the phenomenon of super-resolution. Evanescent wave is propagated by multilayer metal/dielectric films alternately. we use microspheres to collect surface evanescent wave, then to image through the optical imaging system. Preparation of multilayered colloidal crystals,the surface of the colloidal crystals depositing the multilayer metal/ dielectric thin film alternately, and then droping a microsphere on the surface of the film.the microsphere is used to collect near-field ligh passed up though the multilayer film in an optical microscope. We study SPP propagation.