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基于光子晶体具有能使落在禁带区间的电磁波无法在其中传播的特性,本文提出一种在普通铅玻璃上镀光子晶体膜的技术,实现了临床防护X线的目的。本文利用传输矩阵法,通过Matlab编程仿真,甄选合适的光子晶体介质材料、厚度及周期数,设计出X线波段高反射率的一维光子晶体复合结构膜,仿真结果显示该光子晶体复合结构膜对X射线的反射率达到90%以上,实现了临床X线防护要求。解决了目前防护X线的无机铅玻璃的铅当量大、厚重、透明度低且成本高的技术难题。该项技术已获得国家专利,专利号为201220228549.2。
Based on the property that photonic crystal can make the electromagnetic wave that can fall in the forbidden band be unable to propagate in it, a technique of coating photonic crystal film on ordinary lead glass is proposed in this paper, which realizes the goal of clinical protection of X-ray. In this paper, the transmission matrix method and the Matlab simulation are used to select the appropriate photonic crystal materials, thickness and number of cycles to design a one-dimensional photonic crystal composite film with high reflectivity in the X-ray band. The simulation results show that the photonic crystal composite film The X-ray reflectivity of more than 90%, to achieve the clinical X-ray protection requirements. The present invention solves the technical problems that the lead lead of the present protection X-ray inorganic lead glass has large equivalent weight, heavy weight, low transparency and high cost. The technology has won the national patent, patent No. 201220228549.2.