Switching Chirality in Arrays of Shape‐Reconfigurable Spindle Microparticles
Switching Chirality in Arrays of Shape‐Reconfigurable Spindle Microparticles
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形状可重构纺锤形微粒阵列中的开关手性
DOI：
10.1002/adma.202303009
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发表时间：
2023-06
影响因子：
29.4
通讯作者：
Mingzhu Liu;Xingyue Han;So Hee Nah;Tianwei Wu;Yuchen Wang;Liang Feng;Liang Wu;Shu Yang
中科院分区：
文献类型：
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作者：
Mingzhu Liu;Xingyue Han;So Hee Nah;Tianwei Wu;Yuchen Wang;Liang Feng;Liang Wu;Shu Yang
当被圆偏振光照射时，手性金属中实现了巨圆光电流效应。然而，结构本身是不可切换的，也不是在相邻的手性域的晶体手性。这里合成了纺锤形液晶弹性体微粒，其可以在加热到高于各向同性转变温度时可逆地从扁长转变到球形再到扁长。当排列在蜂窝晶格中时，微粒的连续形状变化导致晶格重构，从右手手性状态到非手性状态，然后到左手手性状态，而不破坏平移对称性。因此，穿过晶格的偏振光的旋转的符号改变，如通过时域太赫兹光谱测量的。此外，它可以使用近红外光照射局部改变相邻域中的手性。可重构手性微阵列将使我们能够探索光-物质界面上拓扑晶格的非平凡对称保护输运模式。具体而言，在非手性/手性域的边界处可控地产生手性状态的能力将导致从对称性和拓扑结构的相互作用中出现的丰富结构。
The giant circular photo‐galvanic effect is realized in chiral metals when illuminated by circularly polarized light. However, the structure itself is not switchable nor is the crystal chirality in the adjacent chiral domains. Here spindle‐shaped liquid crystalline elastomer microparticles that can switch from prolate to spherical to oblate reversibly upon heating above the nematic to isotropic transition temperature are synthesized. When arranged in a honeycomb lattice, the continuous shape change of the microparticles leads to lattice reconfiguration, from a right‐handed chiral state to an achiral one, then to a left‐handed chiral state, without breaking the translational symmetry. Accordingly, the sign of rotation of the polarized light passing through the lattices changes as measured by time‐domain terahertz spectroscopy. Further, it can locally alter the chirality in the adjacent domains using near‐infrared light illumination. The reconfigurable chiral microarrays will allow us to explore non‐trivial symmetry‐protected transport modes of topological lattices at the light–matter interface. Specifically, the ability to controllably create chiral states at the boundary of the achiral/chiral domains will lead to rich structures emerging from the interplay of symmetry and topology.