Ultra-small shape-simplified optical diode derived from topology optimal design in plasmonic waveguide
Ultra-small shape-simplified optical diode derived from topology optimal design in plasmonic waveguide
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DOI：
10.1587/elex.16.20190598
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发表时间：
2019-11
期刊：
影响因子：
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通讯作者：
A. Iguchi;Yasuhide Tsuji
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文献类型：
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作者：
A. Iguchi;Yasuhide Tsuji
本文提出了一种超小型等离子体激元光二极管，它采用金属-绝缘体-金属（MIM）结构，将对称模转换为非对称模，并反射对称模的后向传播。根据我们先前的研究中得到的拓扑优化结构，推导出了光二极管的轮廓，并对其进行了简化，以减少插入损耗和制造难度。使用进化算法之一的微分进化（DE）找出最佳轮廓，并考虑制造公差进行优化。根据二维有限元数值模拟的结果，优化后的等离子体光二极管在C波段的插入损耗<0. 5dB，前向反射< − 20 dB，后向透射< − 20 dB，并能容忍² 5 nm的边界偏差。此外，该器件具有极小的功能区域（< 1.5µm）。
We present in this paper an ultra-small plasmonic optical diode, which converts a symmetric mode into an asymmetric one and re fl ects backward propagation of the symmetric one, with a metal-insulator-metal (MIM) structure. A pro fi le of an optical diode is derived from a topology optimal structure obtained in our previous study, and it is simpli fi ed so as to reduce insertion loss and di ffi culty in fabrication. An optimal pro fi le is found out using a di ff erential evolution (DE) which is one of the evolutionary algorithms, and optimization is carried out taken into account fabrication tolerance. According to the results of numerical simulation by 2D fi nite element method (FEM), the optimized plasmonic optical diode has insertion loss of < 0.5dB, re fl ection of < − 20dB in the forward propagation, and backward transmission of < − 20dB over C-band, and it is tolerant of ² 5nm boundary deviation. In addition, this device has an extremely small functional region ( < 1.5µm).