Giant Tunable Circular Dichroism of Large-Area Extrinsic Chiral Metal Nanocrescent Arrays

Autor: Liyuan Cao, Jiwei Qi, Qiang Wu, Zhixuan Li, Ride Wang, Junan Chen, Yao Lu, Wenjuan Zhao, Jianghong Yao, Xuanyi Yu, Qian Sun, Jingjun Xu
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Nanoscale Research Letters, Vol 14, Iss 1, Pp 1-7 (2019)
Druh dokumentu: article
ISSN: 1931-7573
1556-276X
DOI: 10.1186/s11671-019-3220-7
Popis: Abstract Circular dichroism (CD) is an interesting phenomenon originating from the interaction of light with chiral molecules or other nanostructures lacking mirror symmetries in three-dimensional (3D) or two-dimensional (2D) space. While the observable effects of optical chirality are very weak in most of the natural materials, they can be designed and significantly enhanced in synthetic chiral structures, where the spatial symmetry of their component are broken on a nanoscale. Therefore, fabrication of composites capable of cheap, time-saving, and giant CD is desirable for the advanced optical technologies. Here, the giant CD of large-area metal nanocrescent array structures was investigated theoretically and experimentally. The largest value of the CD spectrum measured was larger than 0.5, and the CD spectrum was tuned effectively and extensively while maintaining a large peak intensity, which can be attributed to the selective excitation of the lattice surface modes (LSMs) by circularly polarized light. The analysis of the extrinsic chiral structure shows potential applications in chiral molecule sensing and polarizing imaging.
Databáze: Directory of Open Access Journals
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