Planar refraction and lensing of highly confined polaritons in anisotropic media.
Planar refraction and lensing of highly confined polaritons in anisotropic media.
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DOI：
10.1038/s41467-021-24599-3
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发表时间：
2021-07-15
影响因子：
16.6
通讯作者：
Alonso-González P
中科院分区：
文献类型：
--
作者：
Duan J;Álvarez-Pérez G;Tresguerres-Mata AIF;Taboada-Gutiérrez J;Voronin KV;Bylinkin A;Chang B;Xiao S;Liu S;Edgar JH;Martín JI;Volkov VS;Hillenbrand R;Martín-Sánchez J;Nikitin AY;Alonso-González P
各向同性介质之间的折射表现为光从低折射率介质到高折射率介质时向正线方向弯曲。然而，各向异性介质之间的折射是一种更奇特的现象，很少被研究，特别是在纳米尺度上。在这里，我们可视化和全面研究了电磁波在两种强各向异性（双曲）介质之间折射的一般情况，我们使用了自然介质α-MoO3中的纳米级限制极化子。折射极化子在穿过平面纳米棱镜时表现出非直观的传播方向，从而揭示了一种奇特的光学效应：无弯曲折射。此外，我们开发了一种平面内折射超透镜，产生的焦点小至λp/6，极化子波长λp（与自由空间光的波长相比，λ0/50）。我们的研究结果为平面纳米光学在强各向异性介质中的应用奠定了基础，具有在纳米尺度上有效控制能量流的潜力。各向异性介质之间的折射仍然是一个未被探索的现象。在此，作者研究了双曲声子极化子穿过α-MoO3纳米棱镜的传播，在自由空间中表现出无弯曲折射效应和亚衍射聚焦，聚焦尺寸小至光波长的1/50。
Refraction between isotropic media is characterized by light bending towards the normal to the boundary when passing from a low- to a high-refractive-index medium. However, refraction between anisotropic media is a more exotic phenomenon which remains barely investigated, particularly at the nanoscale. Here, we visualize and comprehensively study the general case of refraction of electromagnetic waves between two strongly anisotropic (hyperbolic) media, and we do it with the use of nanoscale-confined polaritons in a natural medium: α-MoO3. The refracted polaritons exhibit non-intuitive directions of propagation as they traverse planar nanoprisms, enabling to unveil an exotic optical effect: bending-free refraction. Furthermore, we develop an in-plane refractive hyperlens, yielding foci as small as λp/6, being λp the polariton wavelength (λ0/50 compared to the wavelength of free-space light). Our results set the grounds for planar nano-optics in strongly anisotropic media, with potential for effective control of the flow of energy at the nanoscale. Refraction between anisotropic media is still an unexplored phenomenon. Here, the authors investigate the propagation of hyperbolic phonon polaritons traversing α-MoO3 nanoprisms, showing a bending-free refraction effect and sub-diffractional focusing with foci size as small as 1/50 of the light wavelength in free space.
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影响因子：
10.8
作者：
Duan, Jiahua;Capote-Robayna, Nathaniel;Alonso-Gonzalez, Pablo
通讯作者：
Alonso-Gonzalez, Pablo
影响因子：
64.8
作者：
Fei, Z.;Rodin, A. S.;Basov, D. N.
通讯作者：
Basov, D. N.
影响因子：
1.9
作者：
Kischkat, Jan;Peters, Sven;Masselink, W. Ted
通讯作者：
Masselink, W. Ted
影响因子：
5.5
作者：
Castellanos-Gomez, Andres;Buscema, Michele;Steele, Gary A.
通讯作者：
Steele, Gary A.
影响因子：
7
作者：
Gomez-Diaz, J. S.;Alu, Andrea
通讯作者：
Alu, Andrea