研究目的
Demonstrating a non-volatile optical switch based on a directional coupler comprising a silicon-Ge2Sb2Te5 (GST) hybrid waveguide to reduce static power consumption in optical switching.
研究成果
The demonstrated non-volatile optical switch based on a silicon-GST hybrid waveguide directional coupler shows promising results with high extinction ratios and low insertion loss. The non-volatility of GST provides a self-holding feature, eliminating the need for static power to maintain switch states. Future work could explore low-loss phase change materials and adiabatic directional coupler designs for improved performance.
研究不足
The insertion loss in the cross state is mainly caused by the GST material loss. The performance could be improved by using low-loss phase change materials such as GeSe and Ge2Sb2Se4Te1. Additionally, the directional coupler's bandwidth could be enhanced by designing an adiabatic directional coupler.
1：Experimental Design and Method Selection:
The study utilizes a directional coupler (DC) composed of a silicon waveguide coupled with a GST-loaded silicon waveguide. The operation principle is based on the phase change of GST material between amorphous and crystalline states to manipulate light propagation.
2：Sample Selection and Data Sources:
The device is fabricated on a SOI wafer with GST deposited on top of one silicon waveguide. The refractive indices of silicon and silica are taken as 3.4764 and 1.444, respectively.
3：4764 and 444, respectively.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes an RF sputtering system for GST deposition, e-beam lithography for patterning, and inductively-coupled plasma (ICP) dry etch for silicon waveguide definition. Materials include Ge2Sb2Te5 (GST) and ZEP-520 e-beam resist.
4：Experimental Procedures and Operational Workflow:
The fabrication process involves cleaning the wafer, spin-coating with e-beam resist, e-beam lithography, ICP dry etch, GST deposition, and lift-off process. The transmission spectrum is measured using a tunable continuous-wave (CW) laser.
5：Data Analysis Methods:
The finite-difference eigenmode (FDE) solver and three-dimensional finite-difference time-domain (3D-FDTD) method are used to calculate the optical transmission and waveguide modes.
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