| With the development of laser technology,laser occupies an important position in industry,science and technology,communications,national defense and military fields.The requirements for laser with different performance in various fields have promoted the development of the light field manipulation technology,which plays an important role in physical chemistry,biological science,material science and interdisciplinary.The light field manipulation has also boosted the development of modern science and has become an important topic in the scientific research field in the 21st century.Moreover,coherence as one of the pivotal optical dimensions plays a unique role in light field manipulation.The research of optical coherence manipulation has attracted much attention in recent years.In this paper,we will study the manipulation of partially coherent light in the macroscopic dimension and the microscopic dimension,respectively.Firstly,we study the physical mechanism of the multi-degree of freedom manipulation of the partially coherent light in macroscopic dimension.The degrees of freedom which are manipulated in the study include the coherence degree,coherence structure,phase distribution and polarization distribution.Specifically,we will study the light manipulation with combination of twist phase and coherence structure or twist phase,optical vortex and polarization.The novel propagation characteristics of light,which is manipulated within more than one degree of freedom,will be studied.Through the study of the statistical properties and transmission properties of these beams,it is confirmed that the manipulation of the combination of these characteristics of light can effectively modulate the intensity,coherence and polarization distribution of the beam in the far field and improve the self-healing ability of the coherent structure of the partially coherent beam.It is shown that the coherence manipulation is crucial in the light field manipulation from the special physical properties of different novel partially coherent beams.On the other hand,in the microscopic dimension,we will study the coherence manipulation of the micro-nano light field with metasurface.Due to the complex experimental devices and high energy consumption of the macroscope optical components,it is a challenge to modulate the coherence of the micro-nano light field.Metasurface,as an artificial microstructure composed of the subwavelength nanostructures,can well solve the limitations that traditional optical devices cannot achieve.Metasurface has achieved singleor multi-degree of freedom manipulation of the amplitude,phase,and polarization of the optical field.But the coherence manipulation with metasurface has not been systematically investigated.We will propose the coherence manipulation of light with metasurface for the first time.Through the manipulation of the coherence degree,coherence structure and polarization of the partially coherent light in the microscopic dimension,the degree of freedom of micro-nano light field modulation is further enriched,and a new method is provided for the coherence manipulation of light field.In this paper,we will propose a statistical metasurface to manipulate the degree of coherence of different incident beams and discuss the statistical properties of this metasurface.Moreover,we will propose another design strategy of the statistical metasurface which can realize the simultaneous manipulation of the coherence structure and coherence length with an integrated metasurface.The transmission properties of the generated beams with unconventional coherence structure has been investigated by numerical simulation and experimental measurements.Furthermore,we will study the combination of the coherence modulation and polarization modulation of the micro-nano optical field with proposed metasurface.The evolution of the intensity and polarization of the vector partially coherent beams with different spatial correlations has been proposed and investigated.The experimental generation of these beams is achieved with the statistical metasurface and a S-waveplate.Our work not only promotes the development of multidegree of freedom manipulation of the partially coherent beams,but also pushes forward the miniaturization and integration development of optical coherence manipulation with the proposed of statistical metasurface. |
