Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 367, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.132059
Keywords
Optical fiber; Biosensor; Surface plasmon resonance; Parylene-C; Gold nanoparticle; Photonic cavity
Funding
- National Science and Technology Major Project of China [2020YFC2004503]
- National Natural Science Foundation of China [61904198]
- Youth Innovation Promotion Association of Chinese Academy of Sciences
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This article introduces a novel plasmonic-photonic hybrid configuration for fiber-optic sensors, which integrates a dielectric coating and dispersed gold nanoparticles onto the fiber tip. This configuration enhances sensing performance and simplifies the fabrication process. By coupling localized surface plasmon resonance with cavity interference mode, a hybrid plasmonic-photonic resonance is successfully excited with enhanced sensitivity, high stability, and precise tunability of resonance frequencies. Experimental results demonstrate real-time monitoring of biomolecular binding interactions at nanomolar concentration, showcasing the potential of this plasmonic-photonic configuration in developing miniaturized high-performance sensing probes.
Owing to the label-free and real-time biosensing advantages, the nanostructured plasmonic biosensors on optical fiber tips have attracted increasing attention as potential plug-and-play remote sensing probes available for limited environments. Various nanostructures have been developed by either top-down or bottom-up approaches on optical fiber tips. However, a trade-off between the sensing performance and manufacturing cost of these plasmonic fiber-optic sensors usually limited their further application. In this context, we propose and systematically investigate a novel plasmonic-photonic hybrid configuration, which dramatically boosts the sensing performance and simplifies the fabrication process. The hybrid configuration integrated onto the fiber tip consists of a dielectric coating acting as the photonic cavity and dispersed Au nanoparticles serving as the plasmonic nanostructures. As a result of the coupling between localized surface plasmon resonance and the cavity interference mode, a hybrid plasmonic-photonic resonance is successfully excited and proved to have serval unique features including enhanced sensitivity, high stability, and precise tunability of the resonance frequencies. Finally, as a proof-of-concept for biosensing, we experimentally demonstrate that the proposed fiber-optic sensors can achieve real-time monitoring of the biomolecular binding interactions at nanomolar concentration, confirming the potential of the plasmonic-photonic configuration in developing miniaturized high-performance sensing probes.
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