Optical Field Control And Channel Analysis Of Disordered Media

Multiple scattering in disordered media causes wavefront distortion,which limits the optical transmission ability.Therefore,it is of great significance to exploit the modulation capability of disordered media by using different control technologies or to explore its optical transmission characteristics to tap the potential of processing optical information.In this paper,the disordered medium is studied through experiments.The experimental optical path and control algorithm are designed to measure the transmission matrix of disordered sample made of zinc oxide particles,and the disordered medium was described in the form of a complex matrix.On the one hand,this paper studies the light field control method of disordered media.Combining with the transmission matrix and the digital optical phase conjugation method,not only the pure phase pattern is recovered from the turbulent speckle image,but also the beam is focused and imaged at any specified position on the detection plane after passing through the disordered medium.In addition,based on the information of the channel contained in the transmission matrix,the intensity of the emitted light field is increased several times by using the wavefront optimization algorithm which needn't measuring the transmission matrix.On the other hand,this paper further studies the optical transmission characteristics of disordered media.Considering the energy constraints of light fields on both sides of the media,the relationship between the transmitted output and the reflected output is explored from the perspective of the channel.Based on the scattering matrix theory and the random matrix theory,the effectiveness of the transmission matrix and the reflection transmission matrix is verified respectively.After calculating the mutual mapping coefficients between channels,the distribution of the coefficients is foundreflects the negative correlation between transmittance and reflectance.