Chou Chao Chung-Ting, Chou Chau Yuan-Fong, Chiang Hai-Pang
Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung, 20224, Taiwan.
Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong, Negara, BE1410, Brunei Darussalam.
Nanoscale Res Lett. 2022 Apr 19;17(1):48. doi: 10.1186/s11671-022-03684-6.
This article designed a novel multi-mode plasmonic sensor based on a metal-insulator-metal waveguide side-coupled to a circular-shaped resonator containing an air path in the resonator. The electromagnet field distributions and transmittance spectra are investigated using finite element method-based simulations. Simulation results show that an air path in the resonator's core would impact the transmittance spectrum of SPPs. Besides, the air path is crucial in offering efficient coupling and generating multiple plasmon modes in the sensor system. The proposed structure has the advantage of multi-channel, and its sensitivity, figure of merit, and dipping strength can reach 2800 nm/RIU, 333.3 1/RIU, and 86.97%, respectively. The achieved plasmonic sensor can also apply for lab-on-chip in biochemical analysis for detecting the existence or nonappearance of diabetes through the human glucose concentration in urine.
本文设计了一种新型多模等离子体传感器，该传感器基于金属-绝缘体-金属波导，其与一个在谐振器中包含空气通道的圆形谐振器侧面耦合。使用基于有限元方法的模拟研究了电磁场分布和透射光谱。模拟结果表明，谐振器核心中的空气通道会影响表面等离激元极化子（SPPs）的透射光谱。此外，空气通道对于在传感器系统中提供有效耦合和产生多个等离子体模式至关重要。所提出的结构具有多通道优势，其灵敏度、品质因数和凹陷强度分别可达2800 nm/RIU、333.3 1/RIU和86.97%。所实现的等离子体传感器还可应用于芯片实验室生化分析，通过检测尿液中的人体葡萄糖浓度来检测糖尿病的存在与否。
