The High Performance Of Organic Photodetector And FANO Resonance Based On Surface Plasmonics

In recent years, the applications on metal surface plasmons become more and more widely, such as surface enhanced Raman scattering, negative refracting materials, laser on surface plasmons, etc. This thesis mainly studies polymer optoelectronic devices enhanced by gold nanoparticles and the Fano resonance of silver heptamer by asymmetrical structures, based on the characters of surface plasmon polaritons such local field enhancement, the increasement of scattering cross section and so on.The organic film photoelectric devices become the focus due to the simple processing, low cost preparation. However, the applications of organic devices can not popularize. There are two reasons, the low absorption efficiency and the lack of technologies on large scale industrialized production. Now, there is a simple method to introduce gold nanoparticles to a polymer semiconductor, not only improving the performance of the device but realizing the large scale preparation. The gold nanoparticles makes the switch of photoelectric device increase by one times. Meanwhile, the Schottky barriers of the interface between gold and polymer obstacle the transport of carriers, improving the devices' stability and longevity.In addition, by introducing asymmetric factors, the structure of the traditional silver heptamer is reformed. The asymmetric silver heptamer have Fano resonance effect as well. Because the local electromagnetic field enhance more than that of traditional structure, the Figure of Merit of refractive index sensor increases from 8.9 to 11.2. At the same time, due to the selectivity of the asymmetric factor to the incident light polarization direction, the Fano resonance is sensitive, which can be applied to plasmonic Fano switch.