Photonic crystal ultraviolet protection glasses

Abstract

The invention discloses a pair of photonic crystal ultraviolet protection glasses. The glasses comprise lenses and photonic crystal layers. The photonic crystal layers are arranged on the surfaces of the lenses. Each photonic crystal layer comprises a Ge medium protection layer and an MgF2 medium protection layer. Photonic crystals are provided with photonic band gaps which have periodic structures. In the band gaps, after electromagnetic waves are scattered via a dielectric function, the strengths of some wavelengths are under the exponential decay state, which are caused by the destructive interference, so that the electromagnetic waves cannot be transferred in the system. The photonic crystal ultraviolet protection glasses utilize the band gap property of the photonic crystals, and the electromagnetic waves of which the frequencies are located in the photonic band gaps cannot be transferred in the photonic crystals, so that the photonic crystals which are made of the dielectric material without absorption can reflect the incident light coming from any direction, and the reflectivity is almost 100%.

Description

technical field [0001] The invention relates to the field of photonic crystals, in particular to photonic crystal ultraviolet protective glasses for realizing the ultraviolet protection function. Background technique [0002] At present, a large number of ultraviolet protective glasses appearing in the market generally adopt the method of doping ultraviolet-absorbing materials in quartz glass, or coating reflective films on the lenses, which can achieve certain ultraviolet protection functions. However, with these simple coating methods, we only pay attention to its UV protection effect, ignoring its transparency to visible light. Although the radiation of ultraviolet rays is reduced, the visibility of the human eye to the target object is reduced, and the pupils are enlarged at the same time, and the fundus receives more ultraviolet rays, which cannot achieve the expected ultraviolet protection effect. Contents of the invention [0003] In order to solve the above-mentio...

AI Technical Summary

Problems solved by technology

However, with these simple coating methods, only focus on its UV protection effect, ignoring its transparency to visible light

Although the radiation of ultraviolet rays is reduced, the visibility of the human eye to the target object is reduced, and the pupils are enlarged at the same time, and the fundus receives more ultraviolet rays, which cannot achieve the expected ultraviolet protection effect.

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