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近年来,太赫兹科学技术在快速发展,它在毒品、爆炸物、有毒危险品等安全检查及反恐怖方面展现出独特的应用前景。常用的自由空间太赫兹时域光谱技术,尽管具有很多优越性和良好的应用前景,但影响其性能提高和进一步推广应用的一些实际问题仍然存在,如对光斑尺寸和样品体积、质量要求等。近年来,随着亚波长人工结构(包括超材料和表面等离子激元器件)的出现,为该问题的解决提供了新的契机。文章综述了作者在太赫兹亚波长人工结构器件传感应用所开展的一系列研究工作,其中包括薄膜材料传感、不同标号汽油传感以及同位素传感等,显著地提高了被测物质的探测灵敏度,同时降低了对被测物质的体积、质量要求,实现了高灵敏、微量物质传感,为太赫兹安全检查及反恐怖应用提供了技术借鉴。此外,文章还介绍了太赫兹亚波长人工结构传感器件未来的发展前景和面临的挑战。
In recent years, the science and technology of terahertz has been developing rapidly, and it has unique application prospects in the security inspection and anti-terrorism of drugs, explosives, toxic dangerous goods and the like. The commonly used free-space terahertz time-domain spectroscopy, despite its many advantages and good application prospects, still has some practical problems that affect its performance improvement and further application, such as spot size, sample volume and quality requirements. In recent years, with the emergence of sub-wavelength artificial structures (including metamaterials and surface plasmon elements), this has provided a new opportunity for the solution of this problem. The article reviews a series of research work carried out by the author in sensing applications of terahertz sub-wavelength artificial structure devices, including thin-film material sensing, different-label gasoline sensing and isotope sensing and the like, which significantly improve the detection of the measured substance Sensitivity, while reducing the volume and quality requirements of the tested substance, realizing high sensitivity and trace substance sensing, and providing technical reference for terahertz security check and anti-terror application. In addition, the article also introduces the future development prospects and challenges of THz sub-wavelength artificial structure sensing devices.