Whispering-gallery mode resonance-assisted plasmonic sensing and switching in subwavelength nanostructures
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Whispering-gallery mode resonance-assisted plasmonic sensing and switching in subwavelength nanostructures Youlin Luo 1, Xiao-Qing Luo1,3,* , Jianji Yi 1, Jie Ou 1, Weihua Zhu 1, Zhiyong Chen 1, W. M. Liu 3,4,5, and Xinlin Wang1,2,* 1
Hunan Province Key Laboratory for Ultra-Fast Micro/Nano Technology and Advanced Laser Manufacture, School of Electrical Engineering, University of South China, Hengyang 421001, China 2 School of Mechanical Engineering, University of South China, Hengyang 421001, China 3 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 4 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China 5 Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, China
Received: 20 August 2020
ABSTRACT
Accepted: 16 November 2020
Whispering-gallery modes (WGMs), confining the resonant photons in nanoscale volumes, have been known to exhibit high-quality factor and sensitivity for electromagnetic waves in the field of nanophotonics. Here, we numerically demonstrate that a metasurface, which consists of periodic arrays with concentrically hybrid rectangular-slot (RS) and circular-ring-aperture (CRA) unit cells, supports polarization-dependent plasmonic sensing and switching in the visible and near-infrared regions. In particular, it is shown that the magnetic plasmon-induced transparency (PIT) effect arises from the coupling between a wideband WGM resonance and a narrowband magnetic dipole resonance mode in the hybrid metasurface. It is of great interest to find that the resonance mode broadening and mode shift sensing can be realized by varying the polarization angle of incident light and the length of the RS structure, respectively. Moreover, a novel and easy-fabricated plasmonic switching can be implemented in the visible and near-infrared regions. By changing the inner radius of the CRA structure, we reveal that the operating wavelength of the plasmonic switching can be extended to the telecom O- or E-band with an optimal ON/OFF ratio being 18.35 dB. Our results provide a path toward designing compact and tunable PIT device and could expand the application range of subwavelength nanostructures to the realm of optical communications and information process.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Pedro Camargo.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05581-8
J Mater Sci
Introduction Optical whispering-gallery mode (WGM) resonators that could strongly enhance light–matter interactions are ideal platforms for many kinds of applications such as biosensors [1], nanoparticle detection [2] and so on. In the WGM micro-/nanocavities, the size mismatches between the optical wavelength and detected molecule or atom that can be compensated by integrating with the subwavelength metallic nanostructures [3]. In the plasmonic nanostructures, the WGM resonance originates from t
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