Effective optical biosensing using a graphene-based metasurface of asymmetric split silicon bars

被引：3

作者：

Yin X. ^{[1
]}

机构：

[1] Institute of Mathematical, Hechi University, Guangxi, Yizhou

来源：

Optik | 2023年 / 287卷

关键词：

Biomolecule; Biosensor; Graphene; Metasurface;

D O I：

10.1016/j.ijleo.2023.171047

中图分类号：

学科分类号：

摘要：

In this paper, we propose an effective optical biosensor based on a graphene-dielectric metasurface. The metasurface is constructed by an array of asymmetric silicon bars deposited on a sheet of graphene. A high quality factor (Q-factor) Fano resonance is supported by the presented structure. In addition, there is a gap within each silicon bar where the optical field is highly confined and a strong light-analyte interaction takes place. Various geometrical parameters of the metasurface are optimized. As a result, a high sensitivity of 392 nm/RIU and figure of merit (FOM) of as high as 587 RIU−1 are obtained. According to the presented results, the resolution of the proposed biosensor is as low as 2.55e-4 and the linearity R2 value is 0.999. The underlying graphene sheet of the metasurface could potentially adsorb and immobilize biomolecules. Such characteristics make the proposed biosensor promising for detection of various biomolecules like hemoglobin. © 2023 Elsevier GmbH

引用

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