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Analysis of subwavelength bandpass plasmonic filters based on single and coupled slot nanocavities

机译：基于单缝隙纳米腔的亚波长带通等离子体滤波器的分析

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摘要

Subwavelength surface plasmon polariton optical filters based on metal-insulator-metal slot nanocavites are proposed and analyzed by using coupled mode theory and a finite element method. Simulation results reveal that a single slot cavity coupled with two access waveguides possesses a bandpass-filtering characteristic with its performance affected by its geometric parameters. To further improve the filtering performance, we explore coupled slot cavities as high-order plasmonic filters. When the slot cavities are side-coupled, the bandpass filtering spectrum is dependent on the positions of the access waveguides. The two slot cavities can also be set orthogonal, leading to strong mutual coupling. With careful tuning of the relative length between the two cavities, improved filtering spectrum can be obtained. Given the sub-wavelength footprint of the proposed plasmonic filters, they can be used in an ultradense plasmonic integrated circuit for optical signal processing.
机译：提出并利用耦合模理论和有限元方法对基于金属-绝缘体-金属缝纳米空穴的亚波长表面等离子体激元滤光片进行了分析。仿真结果表明，与两个接入波导耦合的单个槽腔具有带通滤波特性，其性能受其几何参数影响。为了进一步提高滤波性能，我们探索耦合槽腔作为高阶等离子体滤波器。当缝隙腔被侧面耦合时，带通滤波频谱取决于接入波导的位置。两个狭槽腔也可以正交设置，从而实现强互耦。通过仔细调节两个空腔之间的相对长度，可以获得改善的滤波光谱。给定所提出的等离激元滤波器的亚波长足迹，它们可以用于超稠密的等离激元集成电路中以进行光信号处理。

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