New Structured Light Fields And Their Applications

With the continuous in-depth study of light fields,new light fields for different applications have been continuously proposed and verified.Among them,light fields with special structures such as amplitude distribution,phase distribution,and polarization distribution have received extensive attention.In order to obtain ideal light field characteristics,on the one hand,people focus their research on the field of light field control,and modulate the amplitude,phase,polarization,frequency,and other parameters of the beam in the time domain and space domain to obtain the traditional light field.On the other hand,the use of a high numerical aperture microscope objective to tightly focus the incident light field,this method can make the incident light field form a highly localized electromagnetic field distribution in the focus area,and show a novel Focusing characteristics: At present,the novel phenomena and characteristics realized in this way have been applied to many fields,including optical microscopy,optical storage,material processing,optical micromanipulation,surface plasmon excitation,etc.,and have achieved remarkable results Effectiveness.Combining the above research trends,in this article we conducted a systematic research on several new structured light fields based on the principle of light field regulation and tight focus.The main research contents are summarized as follows:2.Two kinds of structured light fields with special amplitude distribution are proposed in theory and experiment: a sine Gaussian beam with angular polarization and a cosine Gaussian beam with radial polarization.The focus characteristics of the tight focus system are calculated and analyzed.3.By controlling the input of the polarization and amplitude of the incident light field,the non-zero transverse energy flow is stabilized in the focal plane of the tight focusing system.In this part,by adjusting the special polarization state of the input light field,the number and size of the transverse energy flow loops can be precisely controlled in the focal plane.Because of the axisymmetric damage of high-order axisymmetric beams,a "channel" distribution appears in the transverse energy flow in the focal plane,and the size and direction of the "channel" can be controlled by modifying the position and rotation Angle of the sector aperture.4.According to the force model of the Rayleigh particle in the tight focus system,the optical capture of the two new structured light fields and the motion of the particles in the light field are calculated and analyzed.