A method for calculating the full vector of far-field light field

Abstract

The invention relates to a far-field light-field full-vector calculating method. After near-field distribution of an optical device is obtained through other full-vector calculation methods, distribution of any point of an optical-field far field is obtained through a full-vector integral method so that precision of full-vector calculation is reserved and speed and far-field calculability of a diffraction algorithm are also realized. The calculation result is more accurate than a scalar approximation method and not only intensity of the far-field light field can be calculated accurately, the phase of the far-field light field can also be calculated accurately. At the same time, because an integral formula is significantly small in occupied memory and unrelated with a far-field distance, a far field which cannot be calculated through other full-vector methods can be calculated so that the method has the advantages of being rapid and efficient. The method is widely applicable to the field of optics.

Description

technical field [0001] The invention relates to a calculation method of a light field, in particular to a calculation method of a far-field light field. Background technique [0002] With the continuous improvement of micro-nano processing technology, optical devices are becoming more and more miniaturized and integrated. The size of existing optical devices can reach the order of microns or even nanometers, and nanoscale optical manipulation that breaks through the diffraction limit can be realized, thereby realizing functions that cannot be accomplished by traditional optical devices. In the design process of this type of micro-nano optical device, it is necessary to calculate the light field modulated by the optical device first, check whether the light field meets people's design goals, and then continuously adjust the parameters of the optical device until the light field reaches the target. device design. Therefore, an accurate and fast light field calculation method...

AI Technical Summary

Problems solved by technology

However, because only one component of the light field is considered, the obtained results are only approximate results, which can be used in the design of traditional large optical devices, but cannot give accurate far-field results in the design of micro-nano optical devices.

However, the full vector finite element or finite time domain difference method requires a large amount of running memory to calculate all the components of the light field. It can only calculate the near-field light field, and cannot give the far-field light field. At the same time, the calculation speed is slow.

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