摘要:
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。
关键词:
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太赫兹
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亚波长
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人工结构
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传感
Abstract:
Recently, terahertz science and technology has developed rapidly, showing poten-tial applications in security and anti-terrorism involving drugs, explosives, hazardous articles, and so on. Among all the techniques, free space terahertz time domain spectroscopy exhibits excellent poten-tial, but certain critical problems need to be solved, such as terahertz spot size and sample volume. For-tunately, the appearance of subwavelength artificial structures including metamaterials and surface plasmon devices offer new possibilities. This paper reviews our research work on terahertz subwave-length artificial structures for sensing applications, including thin film, gasoline and isotope sensing. It is shown that our devices have excellent sensitivity. Finally, we discuss the prospects and challenges of this technique.
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