In this paper, an all-optical plasmonic modulator is proposed. The structure consists of an InGaAsP nano-disk resonator, surrounded by a Si ring-shaped resonator which is located inside a circular cavity, and two perpendicular metal–insulator-metal plasmonic waveguides. The structure also contains a graded stub filter to separate the control signal from the data signal at the output port. The horizontal and vertical waveguides are used for data and control signals, respectively. Using two separate waveguides for data and control signals causes a suitable isolation between two such signals. The finite-difference time-domain (FDTD) method is used for numerical investigation of the proposed structure, and we use a very detailed Drude-Lorentz model for modeling Ag. To provide more insight, the time-domain behavior of the designed amplitude modulator is also investigated. It is worth mentioning that the Kerr effect is used to modulate the data signal. The most remarkable advantages of the proposed structure are high extinction ratio, isolated data and control ports, low pump intensity, tunable data wavelength, small footprint, and simple structure. Based on the mentioned properties, this modulator has the potential to be used in complex integrated optical circuits.

本文提出了一种全光等离子体激元调制器。该结构由一个InGaAsP纳米盘谐振器和两个垂直的金属-绝缘体-金属等离子波导管组成，该谐振器被一个位于圆形空腔内的Si环形谐振器围绕着。该结构还包含一个分级存根滤波器，用于将控制信号与输出端口的数据信号分开。水平和垂直波导分别用于数据和控制信号。将两个分开的波导用于数据和控制信号会导致两个这样的信号之间的适当隔离。有限差分时域（FDTD）方法用于所提出结构的数值研究，并且我们使用非常详细的Drude-Lorentz模型对Ag进行建模。为了提供更多见解，还研究了所设计的调幅器的时域行为。值得一提的是，克尔效应用于调制数据信号。所提出的结构的最显着优点是消光比高，数据和控制端口隔离，泵浦强度低，数据波长可调，占地面积小和结构简单。基于上述特性，该调制器具有在复杂的集成光学电路中使用的潜力。