Solving method and system for light diffraction transmission problem

Abstract

The invention discloses a solving method and system for a light diffraction transmission problem, and relates to the field of optics. The method comprises the steps of constructing a calculation region grid; tracing the main light in the calculation area grid, and expanding the first interface of the crystal through which the main light passes into an infinite plane; tracing other light in the calculation area grid, and determining intersection points of the other light and the infinite large plane; judging whether the other light and the main light are on the same side or not according to theintersection points, if not, generating virtual light of the other light, wherein the virtual light is supposed to be propagated in the crystal and follows the same physical propagation rule as the main light; and solving a diffraction transmission problem according to the main light and the virtual light. The method can be used for the diffraction transmission calculation process of plane reflection of any shape, has the advantage of high practicability, and solves the problem that a traditional light field diffraction transmission solving method cannot be applied to the propagation processof light in an unparallel plane.

Description

technical field [0001] The invention relates to the field of optics, in particular to a method and system for solving light diffraction transmission problems. Background technique [0002] The traditional calculation of light field diffraction transmission usually uses the method of fast Fourier transform and propagator. First, a calculation area of ​​the light field is constructed, which is usually more than 1.5 times larger than the actual area of ​​the light field, so as to avoid the influence of diffraction caused by the boundary on the calculation results. like figure 2 As shown, a schematic diagram of diffraction transmission when light is directly transmitted is provided. The calculation area grid is transferred to the frequency space after FFT, and the propagators of the dz distance are superimposed, and then the inverse FFT is performed to return to the position space. At this point, you can add amplification and absorption processes in the position space, and then...

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Problems solved by technology

[0003] The existing method has no problem in calculating the light in the process of straight line transmission, but in some cases, when it is necessary to calculate the diffractive transmission in the beam reflection process, the existing method will not be directly applicable, especially for the light in non-parallel planes In the process of propagation, multiple reflections are involved, and the traditional solution method of light field diffraction transmission cannot be applied

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