Surface plasmon polaritons on thin-slab metal gratings
Surface plasmon polaritons on thin-slab metal gratings
复制标题
DOI：
10.1103/physrevb.67.235404
复制
发表时间：
2003-06
影响因子：
3.7
通讯作者：
I. Hooper;J. Sambles
中科院分区：
文献类型：
--
作者：
I. Hooper;J. Sambles
在最近发表的一篇论文[U·施罗特和D·海特曼，Phys.Rev.B60,4992(1999)]当两个界面上的波纹相同且彼此同相时，当光线入射到周期性波纹的金属薄膜上时，发生了意想不到的结果。人们观察到，不可能在背向入射光的金属表面上激发表面等离子体激元，他们将其归因于金属内部没有厚度变化。本文对它们的结果给出了不同的解释，表明表面等离子体激元(SSP)实际上在这种结构的传输侧被激发得很弱。文中解释了为什么这种耦合如此弱，因为它抵消了来自两个衍射面的渐逝衍射级，以及通过改变两面上的光栅之间的相位，这种耦合是如何变得更强的。对这种结构上的SPP激发可能导致传输极大值或极小值这一现象也给出了解释。
In a recently published paper [U. Schroter and D. Heitmann, Phys. Rev. B 60, 4992 (1999)] an unexpected result occurred when light was incident upon a periodically corrugated thin metal film when the corrugations on thetwo interfaces were identical and in phase with each other. It was observed that it was not possible to excite the surface plasmon polariton on the metal surface facing away from the incoming light, and they ascribed this to the lack of a thickness variation within the metal. In this paper a somewhat different interpretation of their results is presented, which shows that the surface plasmon polariton (SSP) is in fact very weakly excited on the transmission side of such structures. It is explained why this coupling is so weak in terms of the cancellation of the evanescent diffracted orders from the two diffractive surfaces and how, by changing the phase between the grating on either surface, this coupling becomes much stronger. An explanation for the observation that SPP excitation on such structures may lead to either transmission maxima or minima is also presented.