In this paper, some biological sensors based on surface plasmon resonance are proposed at visible and near-infrared wavelengths and their performance is improved. The structure of these sensors includes metals, graphene, and 2D transition metal dichalcogenides (TMDCs). Metals such as gold, silver, and copper and a different number of graphene and WS₂ layers are investigated for improving the performance of this sensor. The sensitivity of this sensor is studied at the three wavelengths of 633 nm, 660 nm, and 785 nm. In addition, by using the particle swarm optimization (PSO) method, reflectivity is optimized in terms of structural parameters. The best absorption belongs to gold with a reflectivity of 1.3383 × 10⁻⁵ (a.u). The results show that this structure which includes metals, graphene, and WS₂ has a better performance in near-infrared wavelengths than in visible wavelengths. In this paper, the angular sensitivity and the figure of merit can reach as high as 336 (Deg/RIU) and 48.27 (1/RIU), respectively, as obtained by the optimized structure.

中文翻译：

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基于贵金属-石墨烯-WS2的表面等离子体共振生物传感器在可见光和近红外波长下的性能增强

本文提出了一些基于表面等离振子共振的生物传感器在可见光和近红外波长，并提高了它们的性能。这些传感器的结构包括金属，石墨烯和2D过渡金属二硫化碳（TMDC）。为了提高该传感器的性能，对金，银和铜等金属以及不同数量的石墨烯和WS ₂层进行了研究。在633 nm，660 nm和785 nm的三个波长下研究了该传感器的灵敏度。另外，通过使用粒子群优化（PSO）方法，根据结构参数优化了反射率。最佳吸收率属于金，反射率为1.3383×10 ^-5（au）。结果表明，这种包含金属，石墨烯和WS _2的结构在近红外波长下的性能要好于可见波长。通过优化结构，本文的角灵敏度和品质因数分别可以达到336（Deg / RIU）和48.27（1 / RIU）。