Thomas J. Watson Laboratories of Applied Physics.
Nano Lett. 2010 Dec 8;10(12):4851-7. doi: 10.1021/nl1024529. Epub 2010 Oct 28.
The realization of practical on-chip plasmonic devices will require efficient coupling of light into and out of surface plasmon waveguides over short length scales. In this letter, we report on low insertion loss for polymer-on-gold dielectric-loaded plasmonic waveguides end-coupled to silicon-on-insulator waveguides with a coupling efficiency of 79 ± 2% per transition at telecommunication wavelengths. Propagation loss is determined independently of insertion loss by measuring the transmission through plasmonic waveguides of varying length, and we find a characteristic surface-plasmon propagation length of 51 ± 4 μm at a free-space wavelength of λ = 1550 nm. We also demonstrate efficient coupling to whispering-gallery modes in plasmonic ring resonators with an average bending-loss-limited quality factor of 180 ± 8.
要实现实用的片上等离子体器件，需要将光高效地耦合进和出表面等离激元波导，其长度尺度要短。在这封信件中，我们报告了在电信波长下，聚合物/金介质负载等离子体波导与绝缘体上硅波导端耦合时的低插入损耗，每个转换的耦合效率为 79 ± 2%。通过测量不同长度的等离子体波导的传输，我们可以独立于插入损耗确定传播损耗，我们发现，在自由空间波长 λ = 1550nm 处，特征表面等离激元传播长度为 51 ± 4μm。我们还展示了与等离子体环形谐振器中的 whispering-gallery 模式的高效耦合，平均弯曲损耗限制的品质因数为 180 ± 8。
