Study On The Assembly And Optical Characteristics Of Laser Evanescent Wave Standing Wave In Micro-Array Structure

In recent years, the research on electromagnetic super-surface materials has become increasingly hot, mainly because of its plasma-induced ( SPP ) subwavelength super-diffraction characteristics.In general, the electromagnetic super-surface is constructed by the sub-wavelength periodic resonator unit. The two-dimensional array structure is constructed. By means of the spatial response of the surface array structure,it is easier to realize the specific band formation, beam splitting and polarization conversion, these characteristics are the extraordinary electromagnetic properties that natural materials do not have, and provide a new technical approach for manipulating electromagnetic waves. It has important application foreground in directional radiation high performance antenna, electromagnetic stealth, phased holography, infrared and THz band functional devices.In this paper, we mainly study the change of the ratio and phase difference of the field intensity of the orthogonal laser, and change the vector direction of the localized electric field of the laser evanescent field. The non-equilibrium optical torque of the nanorods is changed and the local orientation of the nanorods is changed. Electromagnetic super-surface array structure composed of nanorod array structure; Study on the process of regulating the rotation of nanorods by orthogonal circularly polarized laser evanescent standing wave field. Firstly, the one-dimensional TE, one-dimensional TM evanescent wave intensity distribution and its corresponding vector distribution are calculated by simulation experiments. The distribution of variable-orthogonal laser evanescent field intensity and its corresponding vector distribution are calculated. The phase difference is obtained by orthogonal circularly polarized evanescent field intensity distribution and its corresponding vector distribution.Secondly, after the nanorods were placed, the field intensity distribution and its corresponding vector distribution were calculated by simulation experiments.The main structure of the paper is as follows:In the first chapter, In this chapter, the research background of the micro-array electromagnetic super-surface composed of metal nanometer arrays and the research status at home and abroad are expounded, and then the basis of the topic is analyzed.In the second chapter, In this chapter, we mainly discuss the formation process of laser evanescent standing wave. Through the theoretical derivation analysis and simulation calculation, the polarization state of the evanescent standing wave is studied in detail, which will change with the change of the polarization state of the incident laser. A one - dimensional laser evanescent standing wave system was built. The metal nanostructured array was deposited by using the optical system.In the third chapter, In this chapter, the mass spectrometry of nanorods is analyzed theoretically. The FDTD simulation experiment is used to calculate the distribution of one-dimensional TE, TM laser evanescent field and two-dimensional orthogonal laser evanescent field intensity distribution. By changing the quadrature laser evapotent field intensity ratio and phase difference, the vector direction of the localized electric field is changed.In the fourth chapter,Calculate the field intensity distribution of the metal nanorod array by circularly polarized light. The array structure of the silver nanorods was irradiated with TM polarized light, and the corresponding scattering spectra were calculated by changing the structure of the silver nanorod array and the incident angle of the light source.