为了克服高阻硅片过低的太赫兹透过率和激光阈值,通过放电等离子体烧结(SPS)工艺制备了一种新型纳米复合材料,可以作为透过太赫兹波、隔离飞秒激光的高效太赫兹滤波器件.器件整体设计原理主要基于瑞利散射,粒径100 nm左右的纳米颗粒可以选择性地使太赫兹波高效透过,透过率最多达90％,远超高阻硅片50％的透过率,并且可以散射掉大部分波长为800 nm的高能激光.器件由太赫兹频段吸收率很低的金刚石纳米颗粒和真空球磨得到的高阻硅颗粒组成,金刚石的高熔点提高了激光阈值,疏松多孔的结构进一步减少了太赫兹波段菲涅尔反射损失,器件整体性能优异.%In order to overcome the low terahertz transmittance and laser threshold of the high resistance silicon,a new type of nanocomposite material was designed and fabricated through the spark plasma sintering (SPS) technology,which can be used as an efficient terahertz filter device for terahertz waves and isolated femtosecond lasers.The overall design principle of the device is mainly based on the Rayleigh scattering.Nanoparticles with a particle size of about 100 nm can selectively pass the terahertz wave efficiently and scatter most of the 800 nm high-energy laser.The device consists of diamond nanoparticles and high-resistance silicon particles obtained by the vacuum ball milling.The high melting point of the diamond increases the laser threshold and the porous structure can further reduce the Fresnel reflection loss and enhance the terahertz transmittance by up to 90 ％.
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