Tunable directional beaming assisted by asymmetrical SPP excitation in a subwavelength metallic double slit
Tunable directional beaming assisted by asymmetrical SPP excitation in a subwavelength metallic double slit
复制标题
亚波长金属双缝中非对称 SPP 激发辅助的可调谐定向光束
DOI：
10.3788/col201210.052401
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发表时间：
2012-05
影响因子：
3.5
通讯作者：
Jin, Guofan
中科院分区：
文献类型：
--
作者：
Li, Xiaowei;Tan, Qiaofeng;Bai, Benfeng;Jin, Guofan
我们提出了一种可调谐定向光束的设计，通过一个亚波长金属双狭缝包围的介电表面起伏光栅。通过控制入射角来非对称激发表面等离子激元（SPPs），可以实现轴向和离轴光束的切换，这些表面等离子激元随后通过双缝左右两侧的两个光栅耦合出传播光束。此外，在保持总功率基本不变的情况下，通过改变入射角可以平滑地调整光功率在两个离轴光束方向上的划分。对这种效应的机理进行了理论分析，并通过严格的数值模拟进行了验证。
We present a design for tunable directional beaming through a subwavelength metallic double slit surrounded by dielectric surface-relief gratings. On-axis and off-axis beaming can be switched by controlling the incident angle to asymmetrically excite surface plasmon polaritons (SPPs) that are subsequently coupled out to propagating beams by the two gratings on the left and the right sides of the double slit. Furthermore, the division of optical power into two off-axis beaming directions can be tuned smoothly by varying the incident angle while keeping the total power almost unchanged. The mechanism of this effect is analyzed theoretically and verified using rigorous numerical simulations.
DOI：
10.1016/c2009-0-20920-2
发表时间：
1985
期刊：
--
影响因子：
--
作者：
D. Lynch;W. Hunter
通讯作者：
D. Lynch;W. Hunter