Circularly polarizing polarizer based on silicon nanobrick metamaterial and its preparation method

Abstract

The invention discloses a circular polarization polarizer based on a silicon nano-brick meta-material and a preparation method of the polarizer. The circular polarization polarizer comprises a substrate, three reflective nano-brick arrays and a transmission nano-brick array; the upper and lower portions of one side surface of the substrate are provided with two reflective nano-brick arrays respectively, and the upper and middle portions of the other side surface, opposite to the side surface, are provided with one transmission nano-brick array and one reflective nano-brick array respectively;the reflective nano-brick array is composed of reflective nano-brick array units which are arranged on the substrate periodically; the reflective nano-brick array unit is composed of dielectric nano-bricks, of different direction angles, arranged in a row at equal interval on the substrate; and the transmission nano-brick array is composed of dielectric nano-bricks arranged on the substrate in anarray. According to the invention, one beam of incident light of random polarization is converted effectively into two beams of circular polarization light of the same rotation direction and unchangedin spreading direction. The circular polarization polarizer and the preparation method thereof have the advantages of being low in loss, easy to prepare, compact in structure, broad in band, and widely suitable.

Description

technical field [0001] The invention belongs to the technical field of information optics, and in particular relates to a circular polarizing polarizer based on a silicon nano-brick metamaterial and a preparation method thereof. Background technique [0002] Circularly polarized light has important applications in the fields of light measurement, light sensing and optical communication. Traditional circular polarizing polarizers are assembled from separate components such as linear polarizers and λ / 4 wave plates. The loss of the whole system is greatly increased, and it is easy to cause the whole system to work unstable. In addition, its applicable wavelength range is extremely limited. Although the all-fiber circular polarization technology has made great progress in reducing the insertion loss and ensuring the stability of the system, its structure is complex and the manufacturing process is not mature enough. Therefore, the circular polarization polarization technology...

AI Technical Summary

Problems solved by technology

Traditional circular polarizing polarizers are assembled from separate components such as linear polarizers and λ / 4 wave plates. The loss of the whole system is greatly increased, and it is easy to cause the whole system to work unstable

In addition, its applicable wavelength range is extremely limited

Although the all-fiber circular polarization technology has made great progress in reducing the insertion loss and ensuring the stability of the system, its structure is complex and the manufacturing process is not mature enough.

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