Modulation Of Electromagnetic Waves By Artificial Micro-nano Structures Containing Metamaterials

Photonic crystals(PCs)are a kind of artificial micro-nano structures composed of materials with different refractive indices,which can manipulate the propagation of electromagnetic waves.PCs have two crucial properties including photonic bandgap(PBG)and photonic localization.Within the PBG,the propagation of electromagnetic waves is strictly prohibited.If defects are inserted into PCs or the periodicity of PCs is broken,the photonic localization appears in the PBG which can lead to the filtering effect.In addition,the photonic localization states appear near the interfaces which can be named as the interface state.Based on PBG and photonic localization,PCs have been used to fabricate many high-quality photonic and electromagnetic devices.In recent years,metamaterials have attracted much attention owing to their unique capability to modulate electromagnetic waves.Metamaterials are artificial micro-nano structures composed of subwavelength units,which have special characteristics different from those of many natural materials.A kind of anisotropic metamaterials with open hyperbolic dispersion attracts much attention,which is named as hyperbolic metamaterials(HMMs)and supports the high-k waves.Based on the abnormal dispersion characteristics of high-k waves,the PCs including HMMs can be used to modulate the new types of the PBG and electromagnetic localized states.The studies on PCs containing metamaterials have the important significance.The main contents of this thesis include two sections.The first section mainly includes theoretical and experimental studies of interface states in the photonic heterostructures composed of single-negative metamaterials and one-dimensional PCs in the microwave range.The other section introduces theoretical studies of the anomalous PBG and photonic localization in PCs containing hyperbolic metamaterials in the microwave region.In chapter 2,we design two different metamaterials including epsilon-negative and mu-negative metamaterials,and two different PCs which have the effect of single-nagative materials in the microwave region.The interface modes are studied theoretically and experimentally in photonic heterostructures composed of single-nagative metamaterials and truncated PCs.The filtering characteristics are studied due to the interface states in photonic heterostructures under the conditions of different polarizations,different incident angles and different periodic numbers of PCs.the experimental results are in good agreement with the theoretical values.In chapter 3,we design the hyperbolic metamaterials composed of metal microstructures and dielectrics in the microwave region.The anomalous PBG and photonic localization are studied theoretically in PCs containing hyperbolic metamaterials in the microwave range.The photonic bandgaps include dispersionless and abnormal red-shift PBGs which depend on the phase variation compensation effects.Furthermore,we study theoretically the angle-insensitive localized states in PCs containing hyperbolic metamaterials.Such PCs can be used to fabricate new high-quality electromagnetic devices in the microwave region.