All-optical micro-droplet separation method based on asymmetric lithium niobate interlayer structure

The invention discloses a micro-droplet separation method. The method adopts an asymmetric interlayer structure consisting of a C cut lithium niobate wafer and a Y cut lithium niobate wafer as a core,and utilizes heterogeneous electric fields generated by the two tangential wafers after being illuminated by the laser to be overlapped so as to separate the micro-droplets in the interlayer. The method is simple in operation step, does not need to preprocess the wafer, and can control the micro-droplet separation part, the separation accuracy, the size of the separated droplet and the separationtime, utilizes the non-local light response characteristics of the Y cut lithium niobate wafer to separate the micro-droplets on two sides of a laser spot in a C-axis direction, so that the adverse influence caused by the long-time large-range direct illumination of the laser on liquid can be reduced. The technology can be used for separating the trace medicaments and fluid samples in the biological, chemical and medical