Surface-enhanced infrared absorption (SEIRA) is a spectroscopic technique used to identify molecular fingerprints by resonant detection of infrared vibrational modes through coupling with the plasmonic modes of metallic nanostructures. Many reported works have demonstrated its capability to enhance the infrared absorption of solid or liquid samples. However, this technique has not been successfully applied to gas sensing yet due to the short light-matter interaction length and intrinsically weak absorption of gas compared to solid or liquid materials. Usually, IR gas sensing is conducted in a gas cell with a long absorption path. In the paper, we propose an integrated photonic device to expand the application of SEIRA to gas sensing by combining metal-organic framework (MOF) ZIF-8 (zeolitic imidazole framework) with plasmonic nanoantenna array. The device consists of an Au nanopatch array on sapphire substrate and is covered by a thin layer of MOF material. The MOF thin film, which is a new class of highly nanoporous material, serves as a gas absorber to selectively adsorb and concentrate CO2 from ambient environment into the thin layer, which has a high spatial overlap with the high intensity optical field of the plasmonic nanopatch antenna array. Namely, we can effectively increase the gas molecule concentration at the hot-spots for the SEIRA device. The experimentally demonstrated peak IR enhancement factor of the device for carbon dioxide sensing is over 1,100 times.
Xinyuan Chong, Ki-Joong Kim, Erwen Li, Yujing Zhang, Paul R. Ohodnicki, Chih-Hung Chang, and Alan X. Wang, "Plasmonic nanoantenna array with single-chip integrated metal-organic framework for infrared absorption gas sensing (Conference Presentation)," Proc. SPIE 10081, Frontiers in Biological Detection: From Nanosensors to Systems IX, 1008105 (Presented at SPIE BiOS: January 29, 2017; Published: 2 May 2017); https://doi.org/10.1117/12.2252648.5382458678001.
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