Numerical Study On Extraordinary Optical Transmission Of Metallic Micro/nano Structures And Its Application In The LED

The new type of photonic devices based on surface plasmons such asoptical waveguides, optical switches and optical coupler Which have greatapplication prospect in the field of optical communication, data storage andphotonic circuits. With the development of the nanometer lithographytechnology, make the Surface Plasmon Polaritons (SPPs) can manipulatephotons movement under nanometer scale. Many new effects and newapplications were found in the study of the interaction between light andsubwavelength metallic micro/nano structures. The extraordinary opticaltransmission (EOT) of light impinging on metallic films perforated withPeriodic subwavelength hole arrays is one of the most attractive phenomenonbased on SPPs.The light-emitting diode (LED) will cause a revolution in lightingtechnology as the fourth generation of solid-state lighting tools. It is urgent tomanufacture LED of high efficiency and high brightness as the high refractiveindex of the LED chip cause the low light extraction efficiency. Domestic andforeign researchers found that surface plasmon generated on themetal/dielectric interface and subwavelength metallic micro/nano structures,which can improve LED light extraction rate. This thesis which is on the basis of existing research at home and abroad,utilized the2D or3D finite difference time domain method (FDTD), incombination with metal dispersion theory and electromagnetic field theory.We numerically studied the enhancement of optical transmission through theperiodic arrays of fish-shaped nano metallic structure arrays, investigated theinfluence of lattice constant and hole shape on the optical filter properties offish-shaped metallic micro/nano structure arrays. We numerically studied theradiation enhancement of metallic micro/nano structure of GaN-LED, and theinfluence of the position of the electric dipole source on GaN-LED lightextraction rate. The main work is as follows:(1) The basic properties of SPPs and physical mechanisms of EOTphenomenon are introduced, the basic theory of finite difference time domainmethod (FDTD) is comprehensive derived. The internal quantum efficiency，light extraction efficiency and external quantum efficiency are introduced.(2) We numerically studied the enhancement of optical transmissionthrough the periodic arrays of fish-shaped subwavelength metallic structurearrays by using the3D finite difference time domain method. The resultsshow that fish-shape metallic nano structure has the properties of tremendoustransmission efficiency and high filter quality factor. It is revealed that opticaltransmission originates from two different physical mechanism，localizedwaveguide resonance mode and surface plasmon resonance mode by analyzing the maps of electric field distribution. Two resonance modes arisein different places in fish-shape hole region at different time with differentforms.(3) We numerically studied the radiation enhancement of metallic/dielectric flip-chip structure of GaN-LED by using the3D finite differencetime domain method, the radiation enhancement of metallic micro/nanostructure of periodic slit array in the metallic/dielectric flip structure model,and the radiation enhancement of metallic grating micro/nano structuremodel.