材料科学
吸收(声学)
光谱学
光学
光电子学
红外线的
表面等离子共振
吸收光谱法
红外光谱学
爆炸物
纳米颗粒
纳米技术
化学
物理
复合材料
有机化学
量子力学
作者
Nicholas Simin,Yangkyu Park,Dongkyu Lee,Thomas Thundat,Seonghwan Kim
出处
期刊:Optics Letters
[The Optical Society]
日期:2020-03-10
卷期号:45 (8): 2144-2144
被引量:5
摘要
Various standoff sensing techniques employing optical spectroscopy have been developed to address challenges in safely identifying trace amounts of explosives at a distance. A flexible anodic aluminum oxide (AAO) microcantilever and a high-power quantum cascade laser utilized as the infrared (IR) source are used for standoff IR reflection-absorption spectroscopy to detect explosive residues on a metal surface. Standoff sensing of trinitrotoluene (TNT) is demonstrated by exploiting the high thermomechanical sensitivity of a bimetallic AAO microcantilever. Moreover, sputtering gold onto the fabricated AAO nanowells generates a strong scattering and absorption of IR light in the wavelength range of 5.18 µm to 5.85 µm resulting in enhanced nanoplasmonic heating. Utilizing the IR absorption enhancement in this wavelength range, the plasmonic AAO cantilever could detect TNT molecules 7 times better than could the bimetallic AAO cantilever.
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