Chou Chau Yuan-Fong, Chou Chao Chung-Ting, Huang Hung Ji, Kooh Muhammad Raziq Rahimi, Kumara Narayana Thotagamuge Roshan Nilantha, Lim Chee Ming, Chiang Hai-Pang
Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong BE1410, Brunei.
Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, Taiwan.
Nanomaterials (Basel). 2020 Oct 15;10(10):2030. doi: 10.3390/nano10102030.
A plasmonic metal-insulator-metal waveguide filter consisting of one rectangular cavity and three silver baffles is numerically investigated using the finite element method and theoretically described by the cavity resonance mode theory. The proposed structure shows a simple shape with a small number of structural parameters that can function as a plasmonic sensor with a filter property, high sensitivity and figure of merit, and wide bandgap. Simulation results demonstrate that a cavity with three silver baffles could significantly affect the resonance condition and remarkably enhance the sensor performance compared to its counterpart without baffles. The calculated sensitivity (S) and figure of merit (FOM) in the first mode can reach 3300.00 nm/RIU and 170.00 RIU. Besides, S and FOM values can simultaneously get above 2000.00 nm/RIU and 110.00 RIU in the first and second modes by varying a broad range of the structural parameters, which are not attainable in the reported literature. The proposed structure can realize multiple modes operating in a wide wavelength range, which may have potential applications in the on-chip plasmonic sensor, filter, and other optical integrated circuits.
采用有限元方法对一种由一个矩形腔和三个银挡板组成的表面等离子体金属-绝缘体-金属波导滤波器进行了数值研究，并通过腔共振模式理论进行了理论描述。所提出的结构形状简单，结构参数数量少，可作为具有滤波特性、高灵敏度和品质因数以及宽带隙的表面等离子体传感器。仿真结果表明，与没有挡板的对应结构相比，带有三个银挡板的腔体能显著影响共振条件，并显著提高传感器性能。在第一模式下计算得到的灵敏度（S）和品质因数（FOM）分别可达3300.00 nm/RIU和170.00 RIU。此外，通过改变广泛的结构参数，在第一和第二模式下S和FOM值可同时超过2000.00 nm/RIU和110.00 RIU，这在已报道的文献中是无法实现的。所提出的结构可在宽波长范围内实现多模式工作，这可能在片上表面等离子体传感器、滤波器及其他光集成电路中具有潜在应用。
