Guan Chunying, Shi Jinhui, Ding Ming, Wang Pengfei, Hua Ping, Yuan Libo, Brambilla Gilberto
Key laboratory of In-fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China.
Opt Express. 2013 Jul 15;21(14):16552-60. doi: 10.1364/OE.21.016552.
In-line rainbow trapping is demonstrated in an optical microfiber with a plasmonic grating. The dispersions of x- and y-polarized surface plasmon polariton (SPP) modes are analyzed in detail by the 3D finite element method (FEM). In this system, the incident light is coupled from an optical microfiber into a graded grating. The plasmonic structure shows strong localization as the dispersion curve approaches cut-off frequency. Gradually increasing the depth or width of the grating elements ensures that the cut-off frequency of the SPP mode varies with the position along the microfiber. Near-infrared light at different frequencies can be trapped in different spatial positions. The in-line rainbow trapping is important for potential applications including optical storage, slow light, optical switch and enhanced light-matter interactions in fiber integrated devices and highly integrated optical circuits.
在带有等离子体光栅的光学微纤维中展示了同轴彩虹捕获。通过三维有限元方法（FEM）详细分析了x偏振和y偏振表面等离子体激元（SPP）模式的色散。在该系统中，入射光从光学微纤维耦合到渐变光栅中。当色散曲线接近截止频率时，等离子体结构显示出很强的局域化。逐渐增加光栅元件的深度或宽度可确保SPP模式的截止频率随沿微纤维的位置而变化。不同频率的近红外光可被捕获在不同的空间位置。同轴彩虹捕获对于包括光存储、慢光、光开关以及光纤集成器件和高度集成光学电路中增强光与物质相互作用在内的潜在应用很重要。
