Tunable full medium multi-frequency band isotrope zero-refraction flat-plate lens and preparation thereof

Abstract

Disclosed are a tunable all-dielectric multiband isotropic zero-refractive flat lens and a fabricating method thereof, wherein the lens comprises an all-dielectric composite flat panel and a temperature control device, the all-dielectric composite flat panel is formed by non-metallic non-magnetic dielectric particles which are periodically arranged or randomly arranged into an array solidified in another epoxy resin substrate, and the dielectric constant of the epoxy resin substrate is far less than that of the dielectric particles. The lens is capable of realizing an effective dielectric constant being zero at certain frequency and an effective magnetic conductivity being zero at certain frequency, thereby realizing zero refraction effect and having the isotropic electromagnetic response characteristic. The controllable zero-refractive effect of temperature is realized by utilizing the sensitive response characteristic of the particle dielectric constant upon the temperature. The lens is capable of realizing zero refraction in the interface for an electromagnetic wave source in the lens, thereby changing the outgoing electromagnetic wave into parallel light rays and improving the directionality of light source, and the tunable all-dielectric multiband isotropic zero-refractive flat lens can be widely applied to the electromagnetic wave communication field.

Description

technical field [0001] The invention relates to an all-dielectric zero-refraction plate lens, in particular to a temperature-tunable all-dielectric multi-band isotropic zero-refraction plate lens. Background technique [0002] Metamaterials (Metamaterials) is a kind of artificial electromagnetic material, which has strange electromagnetic properties that the existing materials in nature do not have. Among them, the metamaterials whose effective permittivity and magnetic permeability are less than zero at the same time are called negative refraction materials or left-handed metamaterials (Left-handed metamaterials, LHMs). Generally, LHMs are composed of metal structural units with electromagnetic response, such as typical metal split ring resonators (SRRs) and metal rod structural units to achieve negative magnetic permeability and negative permittivity, Ω structural units, fishing nets, etc. structure and fractal tree structure etc. [0003] Another type of metamaterial wi...

AI Technical Summary

Problems solved by technology

At present, zero-refraction materials are usually composed of metal structural units with electromagnetic response. The two structural units respectively achieve zero dielectric constant or zero magnetic permeability. It is difficult to use the same metal structural unit to simultaneously achieve zero-refractive effects in different frequency bands.

At the same time, the electromagnetic response characteristics of zero-refraction materials based on metal structural units are anisotropic, that is, they only have zero-refraction effects in a certain direction, so that electromagnetic waves propagating in certain directions cannot be emitted in parallel, which greatly limits its application range.

In addition, since the electromagnetic resonance frequency band of metamaterials is narrow and once the sample is designed and processed, its electromagnetic response frequency and the frequency band to achieve zero refraction cannot be changed, which limits its practical application.

Images