نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری، دانشگاه سمنان، سمنان، ایران
2 دانشیار، دانشگاه سمنان، سمنان، ایران
3 پژوهشگر، دانشگاه جامع امام حسین(ع)، تهران، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In this article, a three-dimensional metal-dielectric-metal surface plasmon resonance sensor with nanodisc arrays is designed and the effect of the nanodisks' thickness is investigated on the performance of a multifunctional sensor based on surface plasmon resonance in liquid and gas sensing. The simulations are done using the finite difference time domain method (FDTD) and by applying appropriate boundary conditions. The results confirm the significant effects of the nanodisks' thickness on the performance of the optical sensor, So that the thickness and linewidth of the resonance peak decrease and increase, respectively, with the rise in the thickness of the nanodisks. Also, a red shift in the resonance wavelength is observed with the increase of the nanodisks' thickness. The results indicate the appropriate sensitivities of these proposed optical sensors in gas and liquid sensing. The sensitivities of these three-dimensional array sensors with the studied nanodisk's thickness (20 to 60 nm) are in the range of 600 to 648 nm/RIU and 588 to 674 nm/RIU for gas and liquid sensing, demonstrating the proposed sensor is a suitable candidate for optical sensing of materials. Also, the nanodisk thickness of 50 nm is obtained as the optimal thickness for sensing in both specific environments due to its appropriate sensitivity value (~640 nm/RIU). In addition, the results demonstrate that the proposed structure can be introduced as a suitable candidate for surface-enhanced Raman spectroscopy due to the formed hot spots and the field distribution in the configuration.
کلیدواژهها [English]
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