Planar Thin-Film Stack Metamaterials:Theory,Modeling And Applications

Light plays an important role in human beings since they are capable to perceive the world,and is always a major focus in physical research.From the initial corpuscular theories and the wave theories to the accurate wave-particle duality descriptions.With the deepening understanding of light,many breakthroughs have been achieved.However,natural materials cannot precisely control the amplitude,phase,and polarization properties,as well as cannot meet the requirements of modern high-performance,multifunctional,and miniaturized devices,which greatly limits the further improvement of device efficiency.The above problems prompted people to try to use the metamaterials which composed of artificially designed subwavelength resonators.Due to the richness degree of freedom and its diversified external response,metamaterials can further improve its ability to control light and can produce novel phenomena that cannot found in natural materials,such as negative refractive index.In recent years,planar thin-film stack metamaterials have attracted much attention due to its advantages of lithography-free,ease of fabrication and high functionality.In chapter I,we were given an overview of the origin,the development,and the novel phenomena of metamaterials,and then focus on the enormous capabilities and applications of planar thin-film metamaterials.In chapter II,we investigated plasmonics thin-film stack metamaterials.Firstly,by using the developed single mode one port coupled mode theory?CMT?combined with transfer matrix method?TMM?,analytical expressions of radiation quality factor?Q_r?and absorption quality factor?Q_a?which associated with the external response and structural parameters are derived.Then,based on the complete phase diagram of CMT,we provided guidelines for the design of the two,three,and multi-layer thin-film stack systems.Furthermore,in light of the insufficiently describe of CMT to the low Q resonance system,partially reflected wave calculations combined with multiple scattering method?MSM?are performed to analyze the optical behaviors.In chapter III,we investigated all-dielectric thin-film stack metamaterials.Previous work showed that local effective-medium theory will breakdown in all-dielectric periodically multilayered metamaterials at the vicinity of the critical angle for total internal reflection.We presented a simple yet robust closed-form nonlocal effective-medium theory whereby the spatial-dispersion effects are fully concerned,which are verified by the TMM calculations.Furthermore,for the first time,we discuss the nonlocal Goos-H?nchen shifts?GHS?in this all-dielectric system,and deduced the GHS expressions in both local and nonlocal cases.In chapter IV,we exhibited three applications,including structural colors,gas sensing and thermal emitters.Firstly,planar bilayer nanostructures for generating wide gamut and angle-insensitive structural colors are presented.Theoretical partial reflected wave analyses are performed to predict the optical behaviours and verified through experiments.Then,dynamically reconfigurable metadevices for H₂S gas sensing are fabricated by utilizing the reversible chemical conversion of Cu O to Cu S upon exposure H₂S containing air.Finally,a large-area mid-infrared?10.6?m?narrow-band and highly directional thermal emitter which composed of a truncated one-dimensional photonic crystal and a continuous metallic film separated by a dielectric spacer are presented.CMT combined with TMM is employed to analytically investigate the emission properties,which plays a certain guidance role in designing a thermal emitter with the desired properties.Thermal infrared emission image of a designed pattern was taken to illustrate the functionality of the device.In chapter V,we discuss the outlook of my thesis and outline its future direction.