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提出了一种基于石墨烯纳米带的齿形表面等离激元波导滤波器,并且用时域有限差分法研究了这种结构.单个齿形的滤波器可以实现带阻滤波,其滤波特性可以用基于散射矩阵的解析模型解释.滤波器的透射谱特性可以通过调节齿的长度、宽度以及石墨烯的化学势来改变.由于石墨烯的化学势可以用门电路来调节,这种结构的滤波器可以在器件加工完成后灵活地调节其工作波长.同时研究了多齿滤波器,这种结构可以实现宽带滤波,文中对具有不同齿数、周期的滤波器的透射谱进行了细致的研究.研究结果对实现基于石墨烯的大规模集成光电子器件提供了重要的理论参考.
A novel toothed surface plasmon waveguide filter based on graphene nanoribbons was proposed, and the finite difference time-domain method was used to study this structure. A single toothed filter can achieve band-reject filtering and its filtering characteristics can be used Based on the analytic model of the scattering matrix, the transmission spectrum of the filter can be modified by adjusting the length and width of the teeth and the chemical potential of graphene. Since the chemical potential of graphene can be adjusted by a gate, The working wavelength of the filter can be flexibly adjusted after the device is processed.At the same time, the multi-tooth filter is researched, which can realize the wideband filtering.The transmission spectra of filters with different numbers of teeth and periods are studied in detail.Results It provides an important theoretical reference for the realization of graphene-based large-scale integrated optoelectronic devices.