Simin Nicholas, Park Yangkyu, Lee Dongkyu, Thundat Thomas, Kim Seonghwan
Opt Lett. 2020 Apr 15;45(8):2144-2147. doi: 10.1364/OL.387653.
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.
为应对远距离安全识别痕量爆炸物的挑战，已开发出多种采用光谱学的遥测传感技术。一种柔性阳极氧化铝（AAO）微悬臂梁和用作红外（IR）源的高功率量子级联激光器被用于遥测红外反射吸收光谱，以检测金属表面的爆炸物残留。通过利用双金属AAO微悬臂梁的高热机械灵敏度，演示了对三硝基甲苯（TNT）的遥测传感。此外，在制造的AAO纳米孔上溅射金会在5.18 µm至5.85 µm波长范围内产生强烈的红外光散射和吸收，从而增强纳米等离子体加热。利用该波长范围内的红外吸收增强，等离子体AAO悬臂梁检测TNT分子的能力比双金属AAO悬臂梁高7倍。
