Bozhevolnyi Sergey I, Volkov Valentyn S, Devaux Eloïse, Ebbesen Thomas W
Department of Physics and Nanotechnology, Aalborg University, Denmark.
Phys Rev Lett. 2005 Jul 22;95(4):046802. doi: 10.1103/PhysRevLett.95.046802.
We report on realization of channel plasmon-polariton (CPP) propagation along a subwavelength metal groove. Using imaging with a near-field microscope and end-fire coupling with a tapered fiber connected to a tunable laser at telecommunication wavelengths (1425-1620 nm), we demonstrate low-loss (propagation length approximately 100 microm) and well-confined (mode width approximately 1.1 microm) CPP guiding along a triangular 0.6 microm-wide and 1 microm-deep groove in gold. We develop a simple model based on the effective-index method that accounts for the main features of CPP guiding and provides a clear physical picture of this phenomenon.
我们报道了沿亚波长金属凹槽实现通道表面等离激元极化激元（CPP）传播的情况。通过使用近场显微镜成像以及与连接到电信波长（1425 - 1620 nm）可调谐激光器的锥形光纤进行端射耦合，我们展示了在金中沿宽度为0.6微米、深度为1微米的三角形凹槽实现了低损耗（传播长度约为100微米）且限制良好（模式宽度约为1.1微米）的CPP波导。我们基于有效折射率方法开发了一个简单模型，该模型解释了CPP波导的主要特征，并为这一现象提供了清晰的物理图像。
