Coupled Mode Demonstration of Slow-Light Plasmonic Sensor Based on Metasurface at Near-Infrared Region
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Coupled Mode Demonstration of Slow-Light Plasmonic Sensor Based on Metasurface at Near-Infrared Region Dong Cheng 1 & Panlong Yu 2 & Lizhi Zhu 2 & Xinyu Yu 2 & Xiangdong Tang 1 & Shiping Zhan 2 Guozheng Nie 2,3
&
Yongyi Gao 2 &
Received: 13 September 2019 / Accepted: 17 February 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, we theoretically and numerically reported a dual plasmon-induced transparency and the relevant sensing property in a multi-cross metasurface by the coupled mode analysis. A phase coupling model was established to characterize the optical response of this plasmonic sensor. It was found that the transparency windows were sensitive to the resonance mode of each metal strip, which was well demonstrated by the theoretical model. Both the sensing property and the slow light in this structure were discussed. A high figure of merit of 223 and sensitivity of 850 nm/RIU were achieved. In addition, the 1170-nm near-infrared light can be slowed down by nearly two order of magnitude with group delay of 0.45 ps in this sensor. These results may provide guidance for light-matter interaction-enhanced slow-light sensor and integrated optical circuit design. Keywords Coupled mode theory . Plasmonic sensor . Plasmon-induced transparency . Metasurface . Slow light
Introduction Plasmon-induced transparency (PIT) is the plasmonic analog of electromagnetically induced transparency(EIT) in nonquantum system in a gentle experimental condition and keeps the similar property in EIT such as strong dispersion in transparency window [1]. In addition, the nanoscale light manipulation in the PIT system makes it a promising candidate in integrated optical circuit, biosensor, and photovoltaic device [2, 3]. Thus the PIT effect generation, properties, and relevant applications were widely investigated in MIM waveguide system [4–7], coupled gratings [8, 9], detuned cavities [10, 11], graphene [12], and metamaterials [13–15] in recent years. Due Dong Cheng and Panlong Yu contributed equally to this work. * Dong Cheng [email protected] * Shiping Zhan [email protected] 1
College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
2
Department of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan 411201, China
3
College of Mathematics and Statistics, Hunan University of Commerce, Changsha 410205, China
to the resonant mode coupling, dark and bright mode for example, very strong dispersion can be found in its transparency window [16]. It is also found that more coupling modes will also create more transparency windows and peaks [17]. As we know, the slowed down velocity of light will lead to the pulse compression and then enhance the pulse intensity [18]. This could be beneficial to the light-matter interaction system, since relatively weak input will generate tremendous response. Based on the previous work [19–21], the slow light proves to be a typical effect in EIT and PIT systems, which is attributed t
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