太赫兹辐射在皮肤中的传输仿真与安全性分析  

Transmission simulation and safety analysis of terahertz radiation in skin

作　　者：刘欣缘 曾昊旻 田昕[1] 李松[1] LIU Xin-yuan;ZENG Hao-min;TIAN Xin;LI Song(School of Electronic Information,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《光学精密工程》2021年第5期999-1007,共9页Optics and Precision Engineering

基　　金：国防科技创新特区项目。

摘　　要：太赫兹辐射中的低频段由于具有很好的穿透性,在太赫兹安检成像系统中得到了广泛的应用,但这增加了人体暴露在太赫兹辐射下的风险,也引发了对太赫兹辐射安全性的担忧。本文建立了皮肤的分层结构模型,计算了皮肤中各层组织的复介电常数和各种光学参数,然后利用蒙特卡洛仿真计算了太赫兹光子在皮肤组织中的传输过程,定量地给出了皮肤各层组织对不同频率太赫兹辐射的衰减倍数。针对穿透性最强的0.1 THz辐射,对光子的穿透深度进行了统计,发现99.9%的光子穿透深度小于0.55 mm,结果表明即使是功率高于损伤阈值的太赫兹辐射也很难传输到皮肤的真皮层下部,证明太赫兹辐射具有较高的安全性,不会对体内器官造成影响。Low-frequency terahertz radiation has been widely employed in terahertz security imaging systems owing to its excellent penetrability.However,this procedure also increases the risk of human exposure to terahertz radiations and raises safety concerns.In this study,the layered structure model of the skin was first established,following which the complex dielectric constant and various optical parameters of skin tissues were calculated.Next,the process of terahertz photon transmission in the skin tissues was determined via Monte Carlo simulation.Finally,the attenuation of the skin tissues to terahertz radiation at different frequencies was determined quantitatively.The penetration depth of 0.1 terahertz photons was analyzed,and it was found that 99.9%of the penetration depth was within 0.55 mm.These results show that it is difficult to transmit terahertz radiation to the lower dermis of the skin,even when the radiation power is higher than the damage threshold;this proves that terahertz radiation is safe and will not affect internal organs.

关 键 词：光电检测 太赫兹辐射 人体安全性 蒙特卡洛仿真 

分 类 号：TB133[机械工程—光学工程]