Planar optical waveguide for refractive index determining with high sensitivity and dual-band characteristic for Nano-sensor application
Planar optical waveguide for refractive index determining with high sensitivity and dual-band characteristic for Nano-sensor application
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DOI：
10.1007/s11082-019-1905-x
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发表时间：
2019-05
影响因子：
3
通讯作者：
Fatemeh Tavakoli;S. Ebrahimi
中科院分区：
文献类型：
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作者：
Fatemeh Tavakoli;S. Ebrahimi
本文提出了一种基于金属-绝缘体-金属光波导的折射率传感器，该传感器具有双波段、高品质因数和高灵敏度的特点。在这个模型中，我们利用了Z形槽的基础上，两个金属层的两个短截线模型和这种结构被放置在SiO2作为基板的介质层的光学系统中的平面应用。此外，参数的研究是用来澄清控制传输和工作频率，以实现在1550和3100 nm的双波段特性，这是适合光纤应用的元素的影响。实际上，复合短截线技术被建议用于基于传输线模型来修改波导的谐振以获得双频带属性。我们模拟这种波导使用有限集成技术（FIT）的方法。假设波导由具有在1至1.5范围内的不同折射率的各种材料填充。我们获得了这些材料的FOM，而Fano响应提供了约3800 RIU− 1的高FOM，灵敏度为1790 nm/RIU。因此，复合短截线策略有助于提高光波导中的FOM因子。
In this paper, we develop an optical waveguide based on metal–insulator-metal as a refractive index sensor with dual-band feature and a high figure of merit (FOM) and sensitivity. In this model, we utilize a Z-shape slot based on two stubs model in both metal layers and this structure is placed over a dielectric layer of SiO2as a substrate for planar application in the optical systems. In addition, the parametric studies are used to clarifying the elements influence on controlling the transmission and working frequency to achieve a dual-band characteristic at 1550 and 3100 nm which is suitable for optical fiber application. In fact, the compound stubs technique is suggested to modify the resonances of the waveguide for dual-band attributes based on the transmission line model. We simulate this waveguide using the Finite Integrated Technique (FIT) method. It is supposed that the waveguide is filled by various materials with the different refractive indexes in the range of 1 to 1.5. We obtain the FOM for these materials while the Fano response provides high FOM about the 3800 RIU−1and the sensitivity is 1790 nm/RIU. Therefore, the compound stubs strategy help to improve the FOM factor in the optical waveguide.