Deep-subwavelength imaging of both electric and magnetic localized optical fields by plasmonic campanile nanoantenna.
Deep-subwavelength imaging of both electric and magnetic localized optical fields by plasmonic campanile nanoantenna.
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DOI：
10.1038/srep09606
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发表时间：
2015-06-05
影响因子：
4.6
通讯作者：
Intonti F
中科院分区：
文献类型：
--
作者：
Caselli N;La China F;Bao W;Riboli F;Gerardino A;Li L;Linfield EH;Pagliano F;Fiore A;Schuck PJ;Cabrini S;Weber-Bargioni A;Gurioli M;Intonti F
在纳米尺度上调整电磁场，使人造材料呈现出自然物质所不具备的迷人光学特性。除了对经典光学和量子光学具有基本意义外，纳米级超材料还为开发颠覆性新技术提供了平台，其中光频率下的电磁辐射场分量的组合与工程师光-物质相互作用有关。因此，在纳米级的两个场分量的光子态的空间分布的实验研究是至关重要的。在这里，我们实验证明了一个伴随的深亚波长近场成像的电和磁强度的光学模式本地化的光子晶体纳米腔。我们利用“钟形尖端”，等离子体近场探头，有效地结合了宽带场增强与强远场近场耦合。通过利用电和磁的极化率组件的钟形尖端沿着与扰动成像方法，我们能够在一个单一的测量映射的电和磁局部近场分布。
Tailoring the electromagnetic field at the nanoscale has led to artificial materials exhibiting fascinating optical properties unavailable in naturally occurring substances. Besides having fundamental implications for classical and quantum optics, nanoscale metamaterials provide a platform for developing disruptive novel technologies, in which a combination of both the electric and magnetic radiation field components at optical frequencies is relevant to engineer the light-matter interaction. Thus, an experimental investigation of the spatial distribution of the photonic states at the nanoscale for both field components is of crucial importance. Here we experimentally demonstrate a concomitant deep-subwavelength near-field imaging of the electric and magnetic intensities of the optical modes localized in a photonic crystal nanocavity. We take advantage of the “campanile tip”, a plasmonic near-field probe that efficiently combines broadband field enhancement with strong far-field to near-field coupling. By exploiting the electric and magnetic polarizability components of the campanile tip along with the perturbation imaging method, we are able to map in a single measurement both the electric and magnetic localized near-field distributions.
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