Active Ag/Co Composite Chiral Nanohole Arrays
Active Ag/Co Composite Chiral Nanohole Arrays
复制标题
活性银/钴复合手性纳米孔阵列
DOI：
10.1021/acs.jpcc.0c08057
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Zhao, Yiping
中科院分区：
文献类型：
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作者：
Luong, Hoang Mai;Pham, Minh Thien;Nguyen, Tho Duc;Zhao, Yiping
研究了Ag/Co复合手性纳米孔阵列的磁旋光性质。CCNA样品的本征圆二色性是由掠射角沉积方法引起的面内对称性破缺引起的，当Ag为主要成分时，它可以通过表面等离子体共振强烈增强。另一方面，Co组分允许磁调谐圆二色性，最大调制幅度高达0.35°。值得注意的是，增强的局部电场诱导的伍德的异常引起更尖锐和更强的磁性圆二色性（归一化为相同的Co含量）的样品与高Ag浓度。实验结果表明，利用CCNAs制备大规模手征光学超颖表面是可行的，在成像和传感领域具有广阔的应用前景。
The magneto-chiroptical properties of Ag/Co composite chiral nanohole arrays (CCNAs) are investigated. The intrinsic circular dichroism of CCNA samples was induced by in-plane symmetry breaking by a glancing angle deposition method, and it can be enhanced strongly by surface plasmon resonance when Ag is a major component. On the other hand, the Co component allows for magnetic tuning circular dichroism, with the maximum modulation amplitude up to 0.35°. Remarkably, the enhanced local electric field induced by Wood’s anomalies gives rise to sharper and stronger magnetic circular dichroism (normalized for the same Co content) of samples with high Ag concentration. The result demonstrates the possibility of fabricating large-scale active chiroptical metasurfaces using CCNAs, which is promising for imaging and sensing applications.