Abstract
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.
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