| Photons are regarded as attractive information carriers.The flexibility and controllability of two-dimensional(2D)photonic sequences as artificial periodic nanostructures for light modulation have attracted much attention from the scientific community.From the microscopic point of view,the lattice arrangement of 2D photonic periodic structures largely determines their far-field optical properties.On this basis,the design and precise fabrication of its structural unit size and symmetry can realize the modulation of multiple freedom degrees of optical parameters and establish the connection between microstructures and macroscopic optical properties,which have broad application prospects in the fields of optical switching devices,polarization imaging,and quantum information.This thesis investigated the structural modulation of two-dimensional photonic periodic structures and their plasmonic lattice resonance properties based on a square lattice anodic aluminum oxide(AAO)nanopore array with a period of 400 nm.The intrinsic optical properties of the square lattice were used to achieve the modulation of the directional spontaneous emission(SE)and polarization tunability of Rhodamine 6G(R6G).Bloch-surface plasmon polariton(Bloch-SPP),formed by periodic modulation of SPP,is used to modulate several optical parameters such as second harmonic generation(SHG)intensity,directional emission,and polarization characteristics.This thesis is based on developing new structures and exploring new properties,which are essential for promoting the development of plasmonic regulation technology and realizing the interaction of optical information on nanoscale.The main researches of this thesis are as follows:(1)Design of 2D photonic periodic structures and regulation of the structural unit cell.Based on the classical 2D photonic structure of the square lattice,anodization and chemical etching methods can be used to produce large-area,low-cost and highly regular AAO nanopore arrays,achieving precise regulation of the size and symmetry characters of the structural unit cell of the square lattice.Meanwhile,the optical properties of the structure and the features of plasmonic surface lattice resonances have been systematically studied using the empty lattice approximate(ELA)model and finite-difference time-domain(FDTD)method.(2)Modulation of the directionality and polarization properties of spontaneous emission(SE)based on square lattice nanopore arrays.A square lattice AAO nanopore array with a period of 400 nm is used as an optical microcavity to investigate the correspondence between the size of the structural unit cell and the energy distribution of the diffractive orders,and to reveal the intrinsic optical properties of the 2D photonic periodic structures,which achieve the directional modulation of the SE of R6 G.This study also investigates the polarization modulation of the SE at different diffractive orders by changing the lattice unit symmetry and opening the degenerate state of diffractive orders by non-perpendicular incidence,and a 90° shift in polarization angle at the same wavelength is realized.This study will help expand the application of 2D photonic periodic structures in the field of optical switching and optical modulation devices.(3)Modulation of SHG by the plasmonic surface lattice resonances effect of the metal nanopore array.The physical vapor deposition(PVD)method is used to add a noble metal layer on the top of the square lattice nanopore array.When the lattice diffraction mode is coupled with the plasmonic resonance mode of the nanopore array,the optical parameters of the incident light are modulated by the 2D photonic periodic structures.By changing the structural parameters of it,the modulation of emission direction and polarization characteristics can be achieved based on the enhancement of SHG by a factor of 5.5 for investigating the interaction between lattice structure and light signals. |
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