Thermal Light Correlation Imaging For Living Objects

The correlation imaging comes from the study of the non-local characteristics of the entangled light source,which is utilized to obtain the image information of the object by using the second order or high-order correlation property of the light field as a new imaging experiment method.The correlation imaging breaks the idea of the traditional optical imaging because it can reconstruct an image of an object,where the object is spatially separated from the detector that serves as a spatial resolving measurement.Thus there are many advantages and characteristics compared with traditional imaging.With the development of correlation imaging,its huge application prospects have much attracted the scientific research institutions and the government.In this paper,an intensity-photon correlation imaging scheme is proposed by using the most advanced EMCCD(electron multiplying CCD camera)and traditional CCD,which aims to its application in low light imaging and detection and further promote its practical application process.Firstly,the basic characteristic of EMCCD has been studied while the structure and working principle of EMCCD are introduced.The influence of different gain on its background and detection capability of EMCCD in gain mode is analyzed.Secondly,the HBT experiment and the lens-free two-dimensional correlation imaging in Low Noise mode are performed,in which the EMCCD and CCD cameras are jointly used to capture the data frames.In the experimental procees,a series of problems such as non-synchronization of acquisition time of the two cameras and inequality of the number of captured frames are overcome.An image is ultimately retrieved according to the second-order intensity correlation function of thermal light.In order to study and improve the practical value of medical imaging in the field of photo-micrography,the HBT experiment and the "quantum" imaging experiment in EM mode were designed and studied.The intensity-photon correlation HBT and imaging experiment were successfully completed for the first time.The minimum ofmean photon number that can reconstruct the correlated image and the range of mean photon number for the better image quality are measured and analyzed in the dynamic detection range of EMCCD,which lays a solid foundation for correlated imaging to the living objects.