Dynamic polarization regulation and control device based on anisotropic chiral metamaterial

Abstract

The invention discloses a dynamic polarization regulation and control device based on an anisotropic chiral metamaterial. The dynamic polarization regulation and control device is composed of a metal reflecting layer, a layer of refractive index adjustable material and a layer of chiral structure (planar anisotropic structure). Mainly based on the microcavity interference effect, adjustable materials with different refractive indexes are filled in the microcavity between the planar anisotropic chiral metamaterial and the metal reflecting layer, external excitation (such as electricity, light, heat, humidity and the like) is applied to the refractive index adjustable materials, the refractive index of the materials is dynamically adjusted, the interference effect of the microcavity is changed, and thus, continuous regulation and control among linearly polarized light, elliptically polarized light and circularly polarized light are realized. The device has the advantages that polarization regulation and control are convenient, the device size is small, the integration level is high, device processing is compatible with an existing integration process, and the working wavelength can be regulated and controlled at will from ultraviolet to millimeter wave bands. The dynamic polarization regulation and control device has wide application prospects in the fields of stereoscopic display, polarization illumination and the like.

Description

technical field [0001] The invention relates to the technical field of optical devices, in particular to a dynamic polarization control device based on anisotropic chiral metamaterials. Background technique [0002] Polarization state is one of the important characteristic parameters of electromagnetic waves, and has very high application value in the fields of polarization imaging, biomolecular detection and communication. For example, by obtaining the polarization state information of the measured target and the background, it is used to detect hidden objects and anti-counterfeiting identification; by using electromagnetic waves of different polarization states combined with the polarization characteristics of the transmitting and receiving antennas, it is used to obtain the best communication signal; through Using the selection of electromagnetic wave polarization state to conduct radar anti-jamming research, etc. In order to obtain the polarization state of light, we of...

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Problems solved by technology

However, such materials have low electromagnetic response to high frequencies. In order to achieve a good polarization control effect, the polarization control devices usually made are bulky, the structure size is much larger than the response band of electromagnetic waves, and the working band is narrow, the cost is high, and it is difficult to integrate. , unable to meet the increasingly urgent needs of communication, imaging, and spectroscopy technologies in the visible and terahertz bands in the future

In addition, polarization modulation devices based on chiral metamaterial structures can only achieve chiral optical effects in fixed wavelength bands, and cannot achieve polarization modulation in a wide range, which limits the application of chiral metamaterials in polarized lighting and display directions.

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