研究目的
To design a plasmonic modulator based on metal-dielectric-metal waveguide in directional coupler structure for modulation, switching, and filtering purposes at telecommunication wavelength.
研究成果
An MDM directional coupler modulator and switch with a high modulation depth and low loss, operating at telecommunication wavelength, is designed. The device uses VO2 in its side arms and elasto-optic effect in the main waveguide for modulation purpose. It can be used as a tunable filter near telecommunication wavelengths by changing its design parameters.
研究不足
The device's performance is limited by the absorption losses in the side arms when VO2 is in its metallic state and the need for precise control over the applied voltage to achieve the desired modulation depth and filtering quality.
1：Experimental Design and Method Selection:
The device is designed using a directional coupler structure with MDM waveguides, utilizing elasto-optic material in the main waveguide and VO2 in the side arms. Finite element method is used for simulation.
2：Sample Selection and Data Sources:
The design parameters include length of gap (G) as 100 nm, L=2.5 μm, W=100 nm, s=30 nm, and thickness of dielectric of main waveguide (d)=100 nm when no voltage is applied.
3：5 μm, W=100 nm, s=30 nm, and thickness of dielectric of main waveguide (d)=100 nm when no voltage is applied.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Comsol Multiphysics software for simulation, gold as metal with permittivity ?m = -118+j11.58, elasto-optic material, and VO
4：58, elasto-optic material, and VOExperimental Procedures and Operational Workflow:
2.
4. Experimental Procedures and Operational Workflow: The device is simulated in three-dimensional Radio Frequency module. Electric field pattern is shown in z direction in the middle of the core of dielectric. Transmission is calculated using boundary integration at the output and input of the device.
5：Data Analysis Methods:
Transmission is calculated by the formula T = Pout/Pin, where Pin and Pout are the power at the input and output of the ports, respectively.
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