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Subradiant dipolar interactions in plasmonic nanoring resonator array for integrated label-free biosensing



Yuzhang Liang, Hui Zhang, Wenqi Zhu, Amit Agrawal, Henri Lezec, Lixia Li, Wei Peng, Y Zou, Yanqing Lu, Ting Xu


With the development of advanced nanofabrication technologies over the last decade, plasmonic nanostructures have attracted wide attention for their potential in label-free biosensing applications. However, the sensing performance of nanostructured plasmonic sensors is primarily limited by the broad-linewidth features in their extinction spectra that result from strong radiative damping. Here, we propose and systematically investigate the in-plane and out-of- plane dipolar interactions in plasmonic nanoring resonator array that is constructed from the spatial combination of classic nanohole and nanodisk structures. Originating from the strong coupling of the dipolar modes from parent nanohole and nanodisk structures, the subradiant lattice plasmon resonance in the nanoring resonator array exhibits narrow-linewidth spectral features and strong near-field electromagnetic enhancement, making it an ideal platform for high-sensitivity chemical and bio-medical sensing. We experimentally demonstrate that the plasmonic nanoring resonator array can be used for high-sensitivity refractive index sensing and real-time monitoring of biomolecular specific binding interactions at nanomolar concentration. Thanks to the simple geometry and high-sensitivity performance, the plasmonic nanoring resonator array provides a promising platform for label-free optical biosensing.
ACS Sensors


Liang, Y. , Zhang, H. , Zhu, W. , Agrawal, A. , Lezec, H. , Li, L. , Peng, W. , Zou, Y. , Lu, Y. and Xu, T. (2017), Subradiant dipolar interactions in plasmonic nanoring resonator array for integrated label-free biosensing, ACS Sensors, [online],, (Accessed July 16, 2024)


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Created November 14, 2017, Updated October 12, 2021