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A low-power consumption MZI thermal optical switch with a graphene-assisted heating layer and air trench

机译：具有石墨烯辅助加热层和空气沟槽的低功耗MZI热光开关

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To reduce the power consumption of thermal optical switches, graphene-assisted hybrid MZI structures were designed and simulated. The hybrid waveguide structures were composed of polymer cores, silica lower claddings, air trenches, and graphene-assisted heating layers. Because of the high thermal-optic coefficient of the polymer, excellent thermal conductivities of silica and graphene, and the air trench structures, the power consumption of the hybrid structures could be reduced to below 0.95 mW. The graphene-assisted heating layers were also designed to bury the waveguide cores or to contact the surface of the waveguide cores for more efficiently conducting the heat of electrodes to the waveguide cores. Moreover, the side heating electrodes introduced were found to be compatible with the designed graphene-assisted heating layers. The polarization and the absorption of both rectangle and ridge waveguide structures were analyzed through optical field simulation. Based on the optimized parameters, the thermal fields were simulated, and the heating efficiencies of the graphene-assisted hybrid structures could be increased by 78% as compared to those of the top electrode device without a graphene layer. Our simulation comprises two MZI thermal optical switches with an optimized balance between the switching power consumption and the switching time. One MZI thermal optical switch with a lower power consumption realized the switching power consumptions of only 0.39 mW and the switching times of 30 μs and 92.4 μs, whereas the other switch with faster switching times achieved the switching power consumptions of 0.95 mW and the switching times as fast as 1 μs and 81.6 μs.
机译：为了减少热光开关的功耗，设计并模拟了石墨烯辅助的混合MZI结构。混合波导结构由聚合物芯，二氧化硅下包层，空气沟槽和石墨烯辅助加热层组成。由于聚合物的高热光系数，优异的二氧化硅和石墨烯导热性以及空气沟槽结构，可将杂化结构的功耗降低至0.95 mW以下。石墨烯辅助的加热层还被设计为掩埋波导芯或与波导芯的表面接触，以更有效地将电极的热量传导至波导芯。此外，发现引入的侧面加热电极与设计的石墨烯辅助加热层兼容。通过光场仿真分析了矩形和脊形波导结构的偏振和吸收。基于优化的参数，模拟了热场，与没有石墨烯层的顶部电极器件相比，石墨烯辅助的杂化结构的加热效率可提高78％。我们的仿真包括两个MZI热光开关，它们在开关功耗和开关时间之间实现了最佳平衡。一个具有较低功耗的MZI热光开关实现了仅0.39 mW的开关功耗以及30μs和92.4μs的开关时间，而另一个具有更快开关时间的开关实现了0.95 mW的开关功耗和开关时间快至1μs和81.6μs。

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