Fluorescence Regulation Based On Metal Resonant Nanostructure

Metamaterials are artificial composite structure with unique electromagnetic properties.The metamaterials have supernormal physical properties,which can break through the limit of the material itself in nature and realize the electromagnetic phenomena that can not be realized in nature,such as anomalous refraction,abnormal reflection,asymmetric transmission of electromagnetic wave,etc.It is because of the unique properties of metamaterials that they can be used to artificially control light and electromagnetic waves,so metamaterials could play very important roles in future military,communication,imaging,sensing and other aspects.In recent years,with the deepening and development of metamaterial research,its great application value has attracted the participation of researchers from various disciplines and they formed a series of interdisciplines.As a modern spectral technology,fluorescence has been widely used in various fields because of its high sensitivity and diversity of methods.However,the application of various fields have their own requirements.Therefore,in order to meet the need of various fields,the research on the regulation of fluorescence based on metamaterials has also attracted extensive attention in recent years,which has promoted its application in biological imaging,biological detection,optoelectronic device development and so on.This paper mainly studies the regulation of fluorescence intensity,direction and polarization state by designing different types of metal resonant nanostructures,which provides a new idea for the preparation of optical devices with specific functions and high sensitivity biological probes.The main contents of the paper are as follows:(1)Introduction about the concept,development history,application of metamaterials,surface plasmon,fluorescence regulation based on nanostructure and its broad application prospects.(2)Introduction about Drude model,dipole model of the fluorescent molecule,the principles of using nanostructure to regulate fluorescence,the finite difference time domain method and the electromagnetic simulation software used in the simulation calculation.(3)The cross metal nanostructure with double resonance is designed,and its influence on the excitation process and emission process of fluorescence is discussed,which proves the advantage of nanostructure with double resonance in enhancing fluorescence intensity.It is also confirmed that the cross nanostructure could result in directional fluorescence emission.(4)A ring groove nanostructure based on toroidal resonance with polarization selective response is designed and simulated.It is found that the nanostructure can not only realize the large enhancement of fluorescence radiation,but also could control the polarization state of fluorescence emission.(5)Summarize and prospect the full paper.