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Chang, Yuhua; Hasan, Dihan; Dong, Bowei; Wei, Jingxuan; Ma, Yiming; Zhou, Guangya; Ang, Kah Wee; Lee, Chengkuo
ACS applied materials & interfaces, 11/2018, Volume: 10, Issue: 44Journal Article
The surface-enhanced infrared absorption (SEIRA) technique has been focusing on the metallic resonator structures for decades, exploring different approaches to enhance sensitivity. Although the high enhancement is achieved, the dissipative loss and strong heating are the intrinsic drawbacks of metals. Recently, the dielectric platform has emerged as a promising alternative. In this work, we report a guided resonance-based all-dielectric photonic crystal slab as the platform for SEIRA. The guided resonance-induced enhancement in the effective path length and electric field, together with gas enrichment polymer coating, leads to a detection limit of 20 ppm in carbon dioxide (CO2) sensing. This work explores the feasibility to apply low loss all-dielectric structures as a surface enhancement method in the transmission mode.
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