Simulation of Self-Aligned Optical Coupling between Micro- and Nano-Scale Devices using Self-Organized Waveguides
Simulation of Self-Aligned Optical Coupling between Micro- and Nano-Scale Devices using Self-Organized Waveguides
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使用自组织波导模拟微米级和纳米级器件之间的自对准光学耦合
DOI：
10.1109/jlt.2014.2386862
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发表时间：
2015
影响因子：
4.7
通讯作者：
T. Yoshimura
中科院分区：
文献类型：
--
作者：
Dai Yoshitomi;Kenji Torizuka;T. Yoshimura
采用时域有限差分法，模拟了3 μ m宽的微米级波导和600 nm宽的纳米级波导之间的自组织波导的生长，纳米级波导的芯边有一个发光靶。两个波导放置在一起，间隙尺寸从16到64 μm，在光致折射率增加型材料中。当从微尺度波导引入400 nm波长的写入光束时，发光目标产生发光。然后，即使当两个波导之间存在600 nm的横向未对准时，波导也在两个波导之间逐渐自组织，并且提供具有1.5-1.8 dB的耦合损耗的自对准光耦合。这表明自组织波导可以用作光学焊料，将多芯片模块或印刷电路板中的微米级波导连接到大规模集成电路中的纳米级波导。获得最小耦合损耗所需的最佳写入时间随着横向未对准的增加而增加。随着间隙距离的增加，最佳写入时间对未对准的依赖性减小，当差距距离为64 μm时，这种依赖性几乎消失，从而实现了光学焊料形成的不受监控。
Using the finite-difference time-domain method, we simulated the growth of self-organized waveguides between a 3-μm-wide micro-scale waveguide and a 600-nm-wide nano-scale waveguide, which has a luminescent target on its core edge. The two waveguides are placed together, with gap sizes ranging from 16 to 64 μm, in a photo-induced refractive-index increase-type material. When a 400 nm wavelength write beam is introduced from the micro-scale waveguide, luminescence is generated by the luminescent target. A waveguide is then gradually self-organized between the two waveguides, even when a lateral misalignment of 600 nm exists between them, and provides a self-aligned optical coupling with a coupling loss of 1.5–1.8 dB. This indicates that the self-organized waveguide can be used as an optical solder to connect a micro-scale waveguide in a multi-chip module or printed circuit board to a nano-scale waveguide in a large-scale integrated circuit. The optimum writing time required to attain the minimum coupling loss increases with increasing lateral misalignment. The dependence of the optimum writing time on the misalignment is reduced with increasing gap distance, and the dependence almost vanishes when the gap distance is 64 μm, thus enabling unmonitored optical solder formation.