Structural parameter optimization method of chiral metasurfaces and micro/nano devices

Abstract

The invention provides a structural parameter optimization method of a chiral metasurface and a micro-nano device. The method includes: determining the parameter space of the structural parameter based on the optimization range of the structural parameter, and determining the initial population according to the parameter space of the structural parameter; The domain finite difference algorithm obtains the transmittance of the left-handed circularly polarized light and the right-handed circularly polarized light of the chiral metasurface corresponding to each individual in the population at the target wavelength, and calculates the difference; The corresponding transmittance difference determines the fitness of each individual; based on the fitness of each individual, select, cross, and mutate individuals in the initial population to generate an optimized population; select left-handed circular polarization at the target wavelength from the optimized population The individual corresponding to the minimum value of the transmittance difference between light and right-handed circularly polarized light is the optimal structural parameter of the chiral metasurface. Using this method, the optimal structural parameters of the chiral metasurface can be quickly and accurately obtained in a huge parameter space.

Description

technical field [0001] The invention relates to the technical field of electronic devices, in particular to a structural parameter optimization method of a chiral metasurface and a micro-nano device. Background technique [0002] Substances that cannot coincide with their mirror images in either rotation or translation are considered chiral, and they and their mirror images are called enantiomers of opposite chirality. Chirality is widespread in nature and has applications in life sciences, sensing, imaging, and biomedicine; for example, a chiral biomolecule can exhibit good drug therapeutic effects, while its other enantiomer Possibly poisonous. In addition, the chirality of the geometric structure can also be reflected in the optical chirality response, that is, the absorption of left-handed and right-handed circularly polarized light is different for chiral species. The chiral optical response of natural chiral molecules is usually weak and difficult to detect, so artif...

AI Technical Summary

Problems solved by technology

In the process of designing a metasurface, it is usually necessary to optimize its structural parameters. The traditional methods include manual search and parameter scanning. These methods can only search for the optimal solution in a very small parameter space. With the parameter As the space increases, the time required will increase exponentially, and the accuracy of the search will also decrease, so the above method cannot be used under complex optimization objectives

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