Meta-material film for left-hand circular polarization conversion

Abstract

The invention discloses a meta-material film for left-hand circular polarization conversion. The meta-material film has a meta-material structure at an optical frequency and comprises metal microstructure layers 1, 3 and a medium substrate layer 2. The metal microstructure layers 1, 3 are positioned on two surfaces of the medium substrate layer 2. The upper surface of the metal microstructure layer 1 is a metal surface 1, and the lower surface of the metal microstructure layer 1 is a metal surface 2. The upper surface of the metal microstructure layer 3 is a metal surface 2, and the lower surface of the metal microstructure layer 3 is a metal surface 4. The metal surface 1 is an incidence plane, and the metal surface 4 is an emitting surface. The metal microstructure layers 1, 3 are of a right-handed rotation windmill structure of chiral symmetry or a spiral right-handed rotation artificial structure of chiral symmetry. A left-handed rotation angle taking a structural center as a rotation center is arranged between the metal microstructure layer 1 and the metal microstructure layer 3. Two orthogonal components of an output light wave are identical in amplitude, and a phase difference between the two orthogonal components is odd times of 90 DEG. The structure is simple, the conversion efficiency is high, a beam of linearly-polarized light can be converted into left-hand circular polarization light, and the output beam is high in quality.

Description

technical field [0001] The invention relates to the field of optical communication, and more specifically, the invention relates to a left-handed circular polarization conversion metamaterial thin film. Background technique [0002] Waves will vibrate in different directions during propagation, and this vibration is called wave polarization, which is an inherent characteristic of waves. For example, electromagnetic waves, sound waves, and gravitational waves all have polarization characteristics, and the polarization characteristics of various waves are also different. For example, the polarization direction of sound waves is consistent with its propagation direction. Usually, such waves whose polarization direction is consistent with the propagation direction are called longitudinal waves. Waves whose polarization direction is perpendicular to the direction of propagation are called transverse waves. The electromagnetic wave is a typical transverse wave, which has the pola...

AI Technical Summary

Problems solved by technology

[0008] According to the structure, the wave plate can be divided into multi-order wave plate, composite wave plate and true zero-order wave plate, but no matter which wave plate has its own shortcomings, such as wavelength sensitivity, temperature sensitivity, incident angle sensitivity, etc. Difficulty in sex or craftsmanship, etc.

Faraday rotators have problems such as poor temperature characteristics, prominent light attenuation, high insertion loss, low control accuracy, and large volume.

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