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基于等离子体金属-绝缘体-金属(MIM)系统中耦合异质腔的独立可调Fano共振

Independently Tunable Fano Resonances Based on the Coupled Hetero-Cavities in a Plasmonic MIM System.

作者信息

Wang Qiong, Ouyang Zhengbiao, Lin Mi, Liu Qiang

机构信息

THz Technical Research Center of Shenzhen University, Shenzhen University, Shenzhen 518060, China.

College of Electronic Science &Technology, Shenzhen University, Shenzhen 518060, China.

出版信息

Materials (Basel). 2018 Sep 10;11(9):1675. doi: 10.3390/ma11091675.

Abstract

In this paper, based on coupled hetero-cavities, multiple Fano resonances are produced and tuned in a plasmonic metal-insulator-metal (MIM) system. The structure comprises a rectangular cavity, a side-coupled waveguide, and an upper-coupled circular cavity with a metal-strip core, used to modulate Fano resonances. Three Fano resonances can be realized, which originate from interference of the cavity modes between the rectangular cavity and the metal-strip-core circular cavity. Due to the different cavity-cavity coupling mechanisms, the three Fano resonances can be divided into two groups, and each group of Fano resonances can be well tuned independently by changing the different cavity parameters, which can allow great flexibility to control multiple Fano resonances in practice. Furthermore, through carefully adjusting the direction angle of the metal-strip core in the circular cavity, the position and lineshape of the Fano resonances can be easily tuned. Notably, reversal asymmetry takes place for one of the Fano resonances. The influence of the direction angle on the figure of merit (FOM) value is also investigated. A maximum FOM of 3436 is obtained. The proposed structure has high transmission, sharp Fano lineshape, and high sensitivity to change in the background refractive index. This research provides effective guidance to tune multiple Fano resonances, which has important applications in nanosensors, filters, modulators, and other related plasmonic devices.

摘要

在本文中,基于耦合异质腔,在等离子体金属-绝缘体-金属(MIM)系统中产生并调谐了多个法诺共振。该结构包括一个矩形腔、一个侧耦合波导和一个带有金属条芯的上耦合圆形腔,用于调制法诺共振。可以实现三个法诺共振,它们源于矩形腔和金属条芯圆形腔之间的腔模干涉。由于不同的腔-腔耦合机制,这三个法诺共振可分为两组,并且通过改变不同的腔参数,每组法诺共振都可以独立地得到很好的调谐,这在实际中可以为控制多个法诺共振提供很大的灵活性。此外,通过仔细调整圆形腔中金属条芯的方向角,可以轻松调谐法诺共振的位置和线形。值得注意的是,其中一个法诺共振出现了反转不对称。还研究了方向角对品质因数(FOM)值的影响。获得了3436的最大品质因数。所提出的结构具有高透射率、尖锐的法诺线形以及对背景折射率变化的高灵敏度。这项研究为调谐多个法诺共振提供了有效的指导,在纳米传感器、滤波器、调制器和其他相关等离子体器件中具有重要应用。

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