The metamaterials with chiral metamolecular structure designs would show optical activity. In the past, researchers devoted themselves to proper designs of the individual metamolecules to improve the optical activity performance, however the roles of the lattice collective modes in the metamaterial array to the final optical activity have received much less attention. Here, how collective resonances can be utilized to engineer the optical activity of the metamaterials is systematically studied. Metamaterial arrays consisting of various numbers of “L”‐shaped chiral metamolecules are fabricated. It is illustrated that the intermolecule collective interactions are capable to dramatically improve the quality factor of the resonances of metamolecule ensembles. Also, it is shown that with the aid of lattice collective resonances, the spectral linewidth of the optical rotation and ellipticity angle modification to the light collapse efficiently and the magnitudes of the optical activity effects can be dramatically boosted. Both the spectral line collapses and the optical activity magnitude becomes saturated as the size of metamaterial array becomes larger than certain sizes, which implies the maximum coupling length between the metamolecules. The results provide a new freedom in optimizing the optical activity of the chiral metamaterials.

中文翻译：

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超材料中的晶格集体相互作用工程光学活性

具有手性高分子结构设计的超材料将显示出光学活性。过去，研究人员致力于对单个大分子进行适当的设计以提高光学活性，但是，超材料阵列中晶格集合模式对最终光学活性的作用却很少受到关注。在这里，系统地研究了如何利用集体共振来设计超材料的光学活性。制造了由各种“ L”形手性大分子组成的超材料阵列。说明了分子间的集体相互作用能够显着提高大分子团簇共振的品质因数。此外，还表明，借助晶格集体共振，旋光度和椭圆度角对光的光谱线宽有效地塌陷，并且可以显着提高光学活性效应的大小。当超材料阵列的尺寸变得大于某些尺寸时，谱线都崩溃并且光学活性幅度变得饱和，这意味着超分子之间的最大耦合长度。结果为优化手性超材料的光学活性提供了新的自由。这意味着大分子之间的最大偶联长度。结果为优化手性超材料的光学活性提供了新的自由。这意味着大分子之间的最大偶联长度。结果为优化手性超材料的光学活性提供了新的自由。