Investigation on the mechanism of optical near field energy transfer in a nanophotonic integrated circuit and connection with external circuites

为了利用光学近场的“纳米光子集成电路”作为下一代光子系统的基本器件，同时进行了以下两项研究。纳米光子集成电路中光学近场能量传递机理的研究：以CuCl量子点为参比样品，通过脉冲激光照射产生光学近场。三个尺寸比为1:2:2的量子点之间的光近场能量传递证实了纳米光子开关的运行。输出信号的上升和下降时间分别为50-90ps和1-2ns。该器件的光能值比传统光子器件的光能值大10-100倍。利用光学近场化学蒸发或沉积的非绝热工艺，制备出了尺寸和位置精度较高的纳米ZnO粒子，用于纳米光子器件和集成电路。即成功制备出尺寸为5nm的纳米锌颗粒，并将其氧化生成纳米ZnO颗粒。进一步观察了ZnO之间的光学近场能量传递。外部电路连接：将金金属纳米线固定在楔形硅衬底上，制作宽度为150nm的等离子体波导，用于传输TM等离子体模式。透射长度大于3μm，符合期望值。为了降低损耗，我们将纳米金属粒子阵列固定成一种新型波导，使传输损耗降低到1/10。此外，为了将表面等离子体耦合到上述阵列的输入端口，利用纳米金属颗粒制作了聚焦器。为了探索纳米波导并行工作的可能性，制作了上述阵列的锯齿形结构。实验证实，传输损耗与线性结构一样低。通过上述实验结果，证实了纳米光子集成电路应用于下一代光子系统的可能性。少

Following two subjects were carried out simultaneously in order to utilize the "nanophotonic integrated circuit" due to optical near fields as a basic device in the next-generation photonic systems.[1]Investigation on the mechanism of optical near field energy transfer in a nanophotonic integrated circuit:Using CuCl quantum dots as reference specimen, optical near fields were generated by illuminating a pulsed laser light. Operation of nanophotonic switch was confirmed due to optical near field energy transfer between three quantum dots with the size ratio of 1:√2:2. Rise-and fall-times of output signal were evaluated as 50-90ps and 1-2ns, respectively. The figure of merit of this device was confirmed to be 10-100 times larger than that of conventional photonic devices. Nanometric ZnO particles, to be used for nanophotonic devices and integrated circuits, were fabricated with high accuracies in their size and position by utilizing nonadiabatic process in optical near field chemical vap … More or deposition. That is, nanometric Zn particles with the size of 5nm was successfully fabricated to be oxidized to form nanometric ZnO particles. Further, optical near field energy transfer between ZnO were observed.[2]Connection with external circuits:Gold metallic nanowire was fixed on a wedged silicon substrate, by which a plasmon waveguide with 150nm-width was fabricated in order to transfer the TM plasmon mode. Transmission length was longer than 3μm, which was as long as the expected value. For lower loss configuration, an array of nanometric metallic particles was fixed to form a novel waveguide, by which the transmission loss was decreased to 1/10. Further, a focuser was fabricated by utilizing nanometric metallic particles in order to couple the surface plasmon to the input port of the above mentioned array. To explore the possibility of parallel operation of nanometric waveguides, a zig-zag configuration of the above mentioned array was fabricated. Transmisson loss as low as the linear configuration was confirmed experimentally.By the experimental results summarized above, possibility of using the nanophotonic integrated circuits for the next generation photonic system was confirmed. Less