| With the expansion of the scale of micro-nano integrated devices,the localized surface plasmon resonances excited by discrete micro-nano structures is restricted to further development in optoelectronic applications due to its high radiation loss.Based on the discrete micro-nano structure,it is constructed into a periodic micro-nano metamaterial,which can support a surface lattice resonances response with ultra-low radiation loss.Originating from the destructive interference of localized surface plasmon resonances in discrete micro-nanostructures with Rayleigh diffracted wave modes in metamaterials,and is therefore characterized by extremely narrow resonance lines in resonance characteristics,benefiting from the characteristics of ultra narrow line-width and strong optical field enhancement,micro-nano metamaterials are widely used in biochemical sensing,spectral enhancement and other fields.However,the excitation of surface lattice resonance effects with excellent resonant properties requiring the metamaterial to be embedded in an environment with a uniform refractive index,which hinders its interaction with surrounding matter molecules.The same time,when the symmetry of the metamaterial environment is broken,it will greatly suppress the resonance amplitude of the surface lattice resonance and increase its resonance line width,which is an inevitable challenge for the development of the sensing field.In addition,when there are some errors in the preparation of micro nano metamaterials,it will inevitably make it difficult to achieve the best performance in practical application,and it is also a problem to realize the active dynamic regulation of surface lattice resonance effect.In this paper,the surface lattice resonances effect in metal,medium and semi-metal metamaterials is studied and the surface lattice resonance mode is regulated by a simple and effective strategy.At the same time,based on its excellent resonance performance,the application potential of the designed metamaterials in the field of plasmon sensing is explored.The main research contents and novelties of this paper are as follows:1.A novel nano metamaterial with dielectric nano cavity coupled with Au truncated cone arrays is proposed theoretically,the excitation of surface lattice resonance modes with narrow linewidth(～8 nm)and strong resonance absorption(>95%)is realized in asymmetric dielectric environment.The mode mechanism in the designed metal metamaterial structure is qualitatively verified by near-field analysis,and the corresponding mode mechanism is quantitatively verified by combining gap cavity resonance theory and Rayleigh diffraction wave theory.Introducing the different shapes of metal metamaterials,the polarization direction of the light source,and the effect of dielectric loss on the surface lattice resonance,the feasibility of its practical application is verified.Finally,the designed metal metamaterial is applied to the refractive index sensing,and the sensing performance with a sensitivity of 527nm/RIU and a FOM value of 64.2 is realized,which has great potential in the application of plasmonic refractive index sensing.2.A novel cylindrical dimer dielectric metamaterial is theoretically designed to simultaneously excite magnetic surface lattice resonance with narrow line-width(～7nm)and strong resonant absorption(>99%)in an asymmetric dielectric environment model.The absorption enhancement mechanism and the magnetic surface lattice resonance mode mechanism in the dielectric metamaterial are verified by near-field analysis,and the mechanism of the magnetic surface lattice resonance mode is quantitatively verified by combining Rayleigh diffraction wave theory.At the same time,the effects of different geometric parameters on the surface lattice resonance properties of the dielectric nano-metamaterial are studied,and verifying the feasibility of its practical application.Finally,the designed metal metamaterial is applied to the refractive index sensing,achieving the sensing performance with a sensitivity of 580nm/RIU and a FOM value of 77.3.In addition,under a certain lattice constant size,the sensitivity of its magnetic surface lattice resonance can reach 824 nm/RIU,and the FOM value is as high as 242,which is far beyond the transmission of magnetic surface lattice resonance in other dielectric metamaterials.sensory performance.3.A novel semi-metal ring metamaterial is theoretically designed,and the dynamic amplitude modulation and frequency modulation of the surface lattice resonance are realized by changing the Fermi level of the semi-metal metamaterial.The surface lattice resonance mode mechanism and fano line-type mechanism in the designed semi-metal metamaterial structure are qualitatively verified by near-field analysis,and the resonance mechanism of the surface lattice resonance is quantitatively verified in combination with lattice diffraction theory.At the same time,focusing on the regulation of the amplitude and frequency of the surface lattice resonance by different Fermi levels.Finally,the designed semi-metal metamaterial is applied to the refractive index sensing,and achieving the sensing performance with a sensitivity of 5.95 THz/RIU and a FOM value of 123.9.In conclusion,this semi-metal metamaterial can effectively realize active dynamic regulation of high sensitive refractive index sensor. |
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