A Subwavelength Focusing Structure Composite of Nanoscale Metallic Slits Array With Patterned Dielectric Substrate
A Subwavelength Focusing Structure Composite of Nanoscale Metallic Slits Array With Patterned Dielectric Substrate
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DOI：
10.1109/jphot.2014.2298406
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发表时间：
2014-02
影响因子：
2.4
通讯作者：
S. Jia;Yiming Wu;Xianhua Wang;Ning Wang
中科院分区：
文献类型：
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作者：
S. Jia;Yiming Wu;Xianhua Wang;Ning Wang
提出了一种新型等离子体透镜，该透镜由金属纳米狭缝和图案化介质衬底组成。在该结构中，所有金属纳米狭缝具有相同的几何参数和间距。入射光的相位在碰撞到金属狭缝之前被基片预先调制。被调制光激发的表面等离子激元（SPPs）波在通过狭缝后被聚焦。数值模拟表明，所产生的焦斑尺寸非常接近半波长。该结构的最大优点是大大降低了制造难度，同时聚焦性能与在狭缝中填充材料的结构相当。
A novel plasmonic lens consisting of metallic nanoslits with a patterned dielectric substrate is proposed. In the structure, all metallic nanoslits have the same geometrical parameters and interspacing. The phase of incident light is modulated beforehand by the substrate before they bump on the metal slits. The surface plasmon polaritons (SPPs) wave excited by the modulated light will be focused after passing through the slits. Numerical simulation demonstrates that the size of the generated focal spot is very close to half wavelength. The overriding advantage of the proposed structure is that it significantly reduces the difficulty in fabrication while the focusing properties are comparable to the ones with filling materials in the slits.