Sensitivity-Enhanced SPR Sensor Based on Graphene and Subwavelength Silver Gratings

Overview

Journal Nanomaterials (Basel)

Date 2020 Oct 29

PMID 33114644

Citations 5

Authors

Lu Kong

Jiangtao Lv

Qiongchan Gu

Yu Ying

Xiaoxiao Jiang

Guangyuan Si

Affiliations

Soon will be listed here.

Abstract

A novel surface plasmon resonance (SPR) sensor with graphene and subwavelength gratings is proposed to improve the sensing performance. A series of numerical analyses were performed to investigate the effect of structural parameters on the sensing performance, such as minimum reflectance at resonance (MRR), full width at half maximum (FWHM), and resonance angle. The results indicated that near-zero MRR (2.9 × 10) and narrow FWHM (about 3.5 deg) could be obtained by optimizing the geometrical parameters. Moreover, the influence of the number of graphene layers on sensitivity was also studied. The maximum sensitivity of the designed sensor could reach 192 deg/refractive index unit (RIU), which is a great enhancement compared to the silver-only SPR sensor. In addition, ethylene glycol solutions with different refractive indices were detected. The results showed that the sensitivity of the sensor could reach 220.67 deg/RIU, and the proposed sensor had excellent linearity between the resonance angle and refractive index, enabling extensive potential practical sensing applications.

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