Journal
OPTICS EXPRESS
Volume 27, Issue 26, Pages 38614-38623Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.382259
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Funding
- National Key Research and Development Program of China [2017YFA0303400]
- National Natural Science Foundation of China [11774036]
- National Natural Science Foundation of China-Research Grants Council [11861161002]
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We study the chiral optical properties of one-dimensional arrays of plasmonic twisted nanorod dimers. By using finite-difference time-domain (FDTD) simulation and analytical approach based on the coupled dipole model, we have revealed unusual chiral optical responses due to the cooperation of local structure and collective effect. It is found that one-dimensional arrays of achiral unit may show chiral optical responses. Moreover, besides the classical bisignate lineshape of circular dichroism (CD) induced by localized surface plasmon resonance, a new CD peak/dip appears, originating from Wood anomaly. Near the Wood anomaly frequency, the optimal twist angle to achieve the highest CD has been shifted compared with that of single twisted nanorod dimer. The universal geometric configurations of the strongest chiral optical responses have been found. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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