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Characteristics of Refractive-Index Sensor in Graphene-Modified Long-Range Surface Exciton-Polaritons |
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| Authors: | Liu Na Wang Shutao Cheng Qi Pang Bo Lv Jiangtao |
| Institution: | 1.School of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, China ;2.Hebei Provincial Key Laboratory of Micro-Nano Precision Optical Sensing and Detection Technology, Northeastern University, Qinhuangdao, 066004, China ; |
| Abstract: | The organic non-crystalline medium of 5,6-dichloro-2-5,6-dichloro-1-ethyl-3-(4-sulfobutyl)-benzimidazol-2-ylidene]-propenyl]-1-ethyl-3-(4-sulfobutyl)-benzimidazolium hydroxide (TDBC) is emerging as possible alternative plasmonic material for noble metal in visible region. In this paper, a novel long-range surface exciton-polariton (LRSEP) sensor based on TDBC film covered with graphene is reported. To enhance the imaging sensitivity, the thickness of TDBC film and the number of graphene layers are optimized. The result shows that the optimized imaging sensitivity is enhanced to 3243 RIU?1 when ns?=?1.34. Compared with the traditional noble metal film-based sensor, the proposed LRSEP sensor demonstrates that the imaging sensitivity has been greatly improved. This is the first study of the TDBC film-based LRSEP sensor, which we hope to support the potential development of chemical sensing and bio-sensing. |
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