Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.
Opt Lett. 2010 Feb 15;35(4):550-2. doi: 10.1364/OL.35.000550.
We have fabricated line gratings from periodically etched fused silica on which a thin silver film is deposited that is in turn covered with a silica index-matched fluid. This dielectrically symmetric geometry supports an independent long-range surface plasmon-polariton (LRSPP) and a short-range surface plasmon polariton, and the associated plasmonic band structure has been probed. Coupling to external light is achieved via the patterned grating, and an ultrasharp LRSPP linewidth of 4 nm is observed. The experimental results are compared with finite-difference time-domain simulations.
我们已经制造出了线光栅，其基底是周期性刻蚀的熔融石英，上面沉积了一层薄薄的银膜，然后再覆盖一层与二氧化硅折射率匹配的液体。这种具有介电对称性的结构支持独立的长程表面等离子体激元（LRSPP）和短程表面等离子体激元，并且已经探测到了相关的等离子体能带结构。通过图案化光栅实现与外部光的耦合，可以观察到超窄的 LRSPP 线宽为 4nm。实验结果与有限时域差分法模拟进行了比较。
