Observation of optical gyromagnetic properties in a magneto-plasmonic metamaterial.
Observation of optical gyromagnetic properties in a magneto-plasmonic metamaterial.
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磁等离子体超材料中光学旋磁特性的观察
DOI：
10.1038/s41467-022-29452-9
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发表时间：
2022-03-31
影响因子：
16.6
通讯作者：
Bi L
中科院分区：
文献类型：
--
作者：
Yang W;Liu Q;Wang H;Chen Y;Yang R;Xia S;Luo Y;Deng L;Qin J;Duan H;Bi L
具有人工光学特性的异向材料引起了人们极大的研究兴趣。特别地，已经报道了在超材料中在光学频率处具有非单位磁导率张量的人工磁共振。然而，只有非统一的渗透率张量的对角元素已被证明到目前为止。在光学频率下没有观察到非零非对角元的旋磁磁导率张量。在这里，我们报告的磁等离子体超材料在近红外波长范围内的旋磁特性的观察。非零的非对角磁导率张量元素导致的横向磁光克尔效应下的s偏振入射，否则消失，如果磁导率张量不是旋磁。通过从反射、透射和横向磁光克尔效应谱中检索磁导率张量元，我们发现在开口环谐振器的谐振波长（~900 nm）处，有效非对角磁导率张量元达到10−3水平，这比相同波长下的磁光材料高出至少两个数量级。人工旋磁导磁率是由于开口环谐振器调制的局部电场方向的变化。我们的研究表明，工程的磁导率和介电常数张量在任意频率的超材料的可能性，从而有希望的各种应用的下一代非互易光子器件，磁等离子传感器和有源超材料。迄今为止，在自然或超材料中没有观察到光学旋磁特性。在这里，作者通过实验证明了磁等离子体超材料的光学旋磁特性，实现了长期寻求的双回转介质。
Metamaterials with artificial optical properties have attracted significant research interest. In particular, artificial magnetic resonances with non-unity permeability tensor at optical frequencies in metamaterials have been reported. However, only non-unity diagonal elements of the permeability tensor have been demonstrated to date. A gyromagnetic permeability tensor with non-zero off-diagonal elements has not been observed at the optical frequencies. Here we report the observation of gyromagnetic properties in the near-infrared wavelength range in a magneto-plasmonic metamaterial. The non-zero off-diagonal permeability tensor element causes the transverse magneto-optical Kerr effect under s-polarized incidence that otherwise vanishes if the permeability tensor is not gyromagnetic. By retrieving the permeability tensor elements from reflection, transmission, and transverse magneto-optical Kerr effect spectra, we show that the effective off-diagonal permeability tensor elements reach 10−3 level at the resonance wavelength (~900 nm) of the split-ring resonators, which is at least two orders of magnitude higher than magneto-optical materials at the same wavelength. The artificial gyromagnetic permeability is attributed to the change in the local electric field direction modulated by the split-ring resonators. Our study demonstrates the possibility of engineering the permeability and permittivity tensors in metamaterials at arbitrary frequencies, thereby promising a variety of applications of next-generation nonreciprocal photonic devices, magneto-plasmonic sensors, and active metamaterials. Optical gyromagnetic properties are not observed in natural or metamaterials to date. Here, the authors experimentally demonstrated optical gyromagnetic properties in a magneto-plasmonic metamaterial, realizing the long-sought bi-gyrotropic medium.
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影响因子：
16.6
作者：
Ignatyeva DO;Karki D;Voronov AA;Kozhaev MA;Krichevsky DM;Chernov AI;Levy M;Belotelov VI
通讯作者：
Belotelov VI
影响因子：
64.8
作者：
Grigorenko, AN;Geim, AK;Petrovic, J
通讯作者：
Petrovic, J
影响因子：
29.4
作者：
Enkrich, C;Pérez-Willard, R;Linden, S
通讯作者：
Linden, S
用于太赫兹单向传输和磁场传感的多功能磁超表面
影响因子：
1.9
作者：
Chen, Sai;Fan, Fei;Chang, Shengjiang
通讯作者：
Chang, Shengjiang
影响因子：
8.6
作者：
Elser, Justin;Podolskiy, Viktor A.
通讯作者：
Podolskiy, Viktor A.