Dionne J A, Lezec H J, Atwater Harry A
Thomas J. Watson Laboratories of Applied Physics, California Institute of Technology, M.C. 128-95, Pasadena, California 91125, USA.
Nano Lett. 2006 Sep;6(9):1928-32. doi: 10.1021/nl0610477.
We report experimental realization of subwavelength slot waveguides that exhibit both micrometer-range propagation and high spatial confinement of light. Attention is given to rectangular waveguides with a Si3N4 core and Ag cladding; core thicknesses of 50-100 nm and widths of 250 nm - 10 microm are explored. Propagation lengths of approximately 5lambda are achieved with light confined to lateral and transverse dimensions of approximately lambda/5 and approximately lambda/2, respectively. This unique combination of light localization and propagation is achieved via interacting surface plasmons, which produce short modal wavelengths and strong field confinement at each metal/dielectric interface.
我们报道了亚波长狭缝波导的实验实现，该波导展现出微米级的光传播以及光的高空间限制特性。重点关注了具有Si3N4芯层和Ag包层的矩形波导；研究了芯层厚度为50 - 100 nm以及宽度为250 nm至10微米的情况。实现了约5λ的传播长度，同时光分别被限制在横向和约λ/5以及横向和约λ/2的尺寸范围内。这种光定位和传播的独特组合是通过相互作用的表面等离子体实现的，表面等离子体在每个金属/电介质界面产生短的模式波长和强场限制。
