Graphene-enhanced dielectric-metal hybrid structure for high performance LSPR sensing

被引:0
|
作者
Li, Lixia [1 ]
Wu, Siyuan [1 ]
Jin, Mingdeng [1 ]
Zheng, Yang [1 ]
Liu, Yufang [1 ]
机构
[1] Henan Normal Univ, Sch Phys, Henan Key Lab Infrared Spectrum Measures & Applica, Xinxiang 453007, Peoples R China
来源
OPTICS EXPRESS | 2024年 / 32卷 / 21期
基金
中国国家自然科学基金;
关键词
SURFACE-PLASMON RESONANCE; PLATFORM; FILMS;
D O I
10.1364/OE.538496
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
In this paper, we introduce what we believe to be a novel hybrid localized surface plasmonic resonance (LSPR) sensing structure that integrates silver nanodisks (Ag-disks), a zinc sulfide (ZnS) layer, and two-dimensional graphene material as a critical intermediary. By exciting the LSPR between the Ag-disks and the surface of the ZnS film, two sensing channels can be achieved in visible spectra. The sensing performance of the proposed sensor is experimentally investigated from two aspects: bulk refractive index and surface sensitivities. As a result, the bulk refractive index sensitivity of 271 nm/RIU is obtained, which is 56 percent higher than that of the sensor without the graphene nanosheets. Furthermore, in terms of surface sensitivity, the sensor with graphene also demonstrates a heightened response to the tiny change in the surface environment. The enhancement is attributed to the graphene-assisted near-field enhancement, which improves the excitation efficiency of LSPR. This work provides a theoretical basis feasible approach for the design of dual channel sensor and paves the way for the experimental exploration of LSPR sensing devices integrated with the 2D materials.
引用
收藏
页码:37466 / 37479
页数:14
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