期刊
NANO LETTERS
卷 21, 期 16, 页码 6828-6834出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01802
关键词
Propeller Chirality; Chiral Surface Lattice Resonances; Circular Dichroism; Nano-Kirigami
类别
资金
- National Natural Science Foundation of China [61675227, 61975016]
- Science and Technology Project of Guangdong [2020B010190001]
- Natural Science Foundation of Beijing Municipality [1212013, Z190006]
In this study, an optical propeller chirality in artificially twisted meta-molecules is demonstrated, which is remarkably different from conventional optical helical chirality, resulting in giant circular dichroism (CD) in a single layer of meta-molecule array. The periodic meta-molecule array is hybridized by unit cells with two different chiral centers due to the special twist of the propeller blades, and the CD response can be readily reversed by tailoring the interference phase through engineering the structural blades without inverting the geometric chirality, as demonstrated in experiments using a nano-kirigami fabrication technique.
Here we demonstrate an optical propeller chirality in artificially twisted meta-molecules, which is remarkably different from conventional optical helical chirality. Giant circular dichroism (CD) is realized in a single layer of meta-molecule array by utilizing the surface lattice resonances that are formed by the coupling of chiral electric quadrupole modes to the diffractive lattice mode. Due to the special twist of the propeller blades, the periodic meta-molecule array is hybridized by unit cells with two different chiral centers. As a result, the CD response is readily reversed by tailoring the interference phase through engineering the structural blades without inverting the geometric chirality. Importantly, the enhanced CD and its sign reversal are demonstrated in experiments by using a nano-kirigami fabrication technique.
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