Fano Resonance And Structural Color Properties Of Micro-nano Material

With the decreasing of materials to nanoscale,the resulted micro-nano structures located in the transition from micro molecular to macroscopic matter.This could exert some novel effects,such as surface effect,quantum size effect,and dielectric confinement effect.These effects introduce some specific properties in dynamics,calorifics,photics,electrics,and magnetics.The research on these effects is not only the important research direction in optical physics,but also further promote the development of micro-nano materials.According to the fabrication,micro-nano materials can be categorized into artifical structure materials and natural structure materials.The lithography-fabricated metamaterials and photonic crystal belong to artifical structure materials.There exists a new type of resonance called Fano resonance in these artifical structure materials.The periodic micro structure of natural materials can also cause the specifically photoelectric properties,such as the color on the butterflies’ wing scale and the peacocks’colourful tail feathers,which are not caused by their inside compoundbut from the spectific structures.This thesis mainly focuses on the optical properties of Fano resonance in artificial and Iridescence of structural color in natural micro-nano materials.The work mainly demonstrates in the following five parts.In Chapter One,we introduced the concepts of metallic surface plasmon,metamaterials,Fano resonance,color and structural color and summarized the backgrounds and the main research progresses on these aspects.In Chapter Two,we launched the theoretical calculation and fitting method on the observed Fano resonance in micro-nanoartificial structure using the MATLAB software,we also analyzed the mutual transition and parameter relationship between Fano resonance and Lorentz resonance.Ultimately,we summarized the relationship between Fano resonance frequency,line width,and the Lorentz oscillator coupling coefficient.The Fano resonance parameters changed obviously with the variation eigenfrequency of Lorentz oscillator.The research results indicate the controlling of Fano resonance can be done by designing of Lorentz resonance in metamaterials and plasmonic materials artificially,which sustains mimicking the quantum effect by classic systems.In Chapter Three,we proposed an Ag nano-crescent elliptical disk(NCED)structures.The commercial software COMSOL simulation generated the local field enhancement of multipolar Fano resonance.Some researches also carried out to explore the relationship between multipolar Fano resonance and geometric parameter and surrounding refractive index.The simulation and fitting results showed that the local electric field enhancement(LFE)factor is linear dependent on the short axis of the ellipse and the surrounding refractive index.The research on multipolar Fano resonance further promote the development on the mimic of Fano resonance,nonlinear optical response,bio-chemistry sensing,and photonic device.In Chapter Four,we presented the mechanism and polarization of the twinkle green color on the back wing of Papilio maackii Menetries(a kind of butterfly).With the help of electronic scanning electron microscopy(SEM)and macro angle-resolved spectrometer,we obtained the detailed structure and spectral information of iridescent color.After the analysis and theoretical calculation,the polarization,chirality,and sensing characteristic were elaborately discussed.The related study provides a promising candidate for bio-mimic applications and photonic structure.In Chapter Five,we summarized our research achievements on theoretical calculation of Fano resonance,simulation of multipole Fano resonance and the optical measurement of butterfly’s wing structure,but also arranged the plan research plan based on our achievements for next step.