摘要
采用介质层加载的方法使表面等离子体激元(SPPs)在传输过程中获得较低的传输损耗。通过比较介质-金属-介质(IMI)和介质加载的波导,证明了此介质加载的方法可以有效地减小表面等离子体的损耗,获得更低的传播速度。然后,在硅介质和金属银中间加载一层二氧化硅来提高介质光栅中表面等离子体慢波传输的性能。通过时域有限差分法证明所提出的结构使得不同频率的入射波产生的SPPs停留在不同高度的介质中,获得很小的传播速度,并且有很小的传输损耗和强的亚波长限制。此结构在光存贮和光通信方面有着很好的应用。
The method of the dielectric loaded is presented to obtain low loss in propagation of the surface plasmon polaritons （SPPs）. Comparing the conventional insulator-metal-insulator （IMI） waveguide and the waveguide with dielectric loaded, it is demonstrated that the method of dielectric loaded can reduce the loss in propagation and achieve smaller group velocity. A silica layer between a silver film and silicon layer is employed to improve the propagation performance of SPPs in the ＂trapped rainbow＂ system based on graded grating structure. Time domain finite difference simulation demonstrates that the improved structure is able to localize light of different frequencies at different positions and offers the advantage of supporting slow SPPs with a much lower propagation loss and deeper sub-wavelength confinement. The proposed structure has a wide range of applications in optical processing and optical communication.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第11期228-233,共6页
Laser & Optoelectronics Progress
基金
广西自然科学基金(2014GXNSFAA118283)
2014年主任基金(GXKL0614104)
关键词
集成光学
表面等离子体激元
时域有限差分法
色散
慢光
低损耗
integrated optics
surface plasmon polarizations
time domain finite difference
dispersion
slow light
low loss
