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Second-Order Nonlinear Circular Dichroism in Square Lattice Array of Germanium Nanohelices
ACS Photonics ( IF 6.5 ) Pub Date : 2024-08-16 , DOI: 10.1021/acsphotonics.4c00721 Grégoire Saerens 1 , Günter Ellrott 2 , Olesia Pashina 3, 4 , Ilya Deriy 3, 5 , Vojislav Krstić 2 , Mihail Petrov 3 , Maria Chekhova 2, 6 , Rachel Grange 1
ACS Photonics ( IF 6.5 ) Pub Date : 2024-08-16 , DOI: 10.1021/acsphotonics.4c00721 Grégoire Saerens 1 , Günter Ellrott 2 , Olesia Pashina 3, 4 , Ilya Deriy 3, 5 , Vojislav Krstić 2 , Mihail Petrov 3 , Maria Chekhova 2, 6 , Rachel Grange 1
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Second-harmonic generation (SHG) is prohibited in centrosymmetric crystals such as silicon or germanium due to the presence of inversion symmetry. However, the structuring of such materials makes it possible to break the inversion symmetry, thus achieving generation of second-harmonic. Moreover, various symmetry properties of the resulting structure, such as chirality, also influence the SHG. In this work, we investigate second-harmonic generation from an array of nanohelices made of germanium. The intensity of the second-harmonic displayed a remarkable enhancement of over 100 times compared to a nonstructured Ge thin film, revealing the influence of interaction between nanohelices. In particular, nonlinear circular dichroism, characterized through the SHG anisotropy factor gSHG–CD, changed its sign not only with the helix handedness but also with its density as well. We believe that our discoveries will open up new paths for the development of nonlinear photonics based on metamaterials and metasurfaces made of centrosymmetric materials.
中文翻译：
锗纳米螺旋方格阵列中的二阶非线性圆二色性
由于存在反演对称性，二次谐波产生（SHG）在硅或锗等中心对称晶体中是被禁止的。然而，这种材料的结构使得打破反演对称性成为可能，从而实现二次谐波的产生。此外，所得结构的各种对称特性（例如手性）也会影响倍频。在这项工作中，我们研究了由锗制成的纳米螺旋阵列产生的二次谐波。与非结构化Ge薄膜相比，二次谐波的强度显着增强了100多倍，揭示了纳米螺旋之间相互作用的影响。特别是，通过 SHG 各向异性因子g SHG–CD表征的非线性圆二色性，其符号不仅随螺旋旋向性变化，而且还随其密度变化。我们相信，我们的发现将为基于中心对称材料制成的超材料和超表面的非线性光子学的发展开辟新的路径。
更新日期：2024-08-16
中文翻译：
锗纳米螺旋方格阵列中的二阶非线性圆二色性
由于存在反演对称性，二次谐波产生（SHG）在硅或锗等中心对称晶体中是被禁止的。然而，这种材料的结构使得打破反演对称性成为可能，从而实现二次谐波的产生。此外，所得结构的各种对称特性（例如手性）也会影响倍频。在这项工作中，我们研究了由锗制成的纳米螺旋阵列产生的二次谐波。与非结构化Ge薄膜相比，二次谐波的强度显着增强了100多倍，揭示了纳米螺旋之间相互作用的影响。特别是，通过 SHG 各向异性因子g SHG–CD表征的非线性圆二色性，其符号不仅随螺旋旋向性变化，而且还随其密度变化。我们相信，我们的发现将为基于中心对称材料制成的超材料和超表面的非线性光子学的发展开辟新的路径。
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