期刊
ACS NANO
卷 14, 期 9, 页码 11876-11887出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c04795
关键词
lattice resonances; periodic arrays; nanoparticle arrays; ultranarrow; bipartite unit cell; plasmons; plasmonic crystals
类别
资金
- U.S. National Science Foundation [ECCS-1710697]
- New Mexico Space Grant Consortium
- Department of Energy Computational Science Graduate Fellowship [DE-SC0020347]
- Spanish MINECO [MDM-2014-0377-16-4]
- Spanish Ministry for Science and Innovation [RTI2018-099737B-I00]
- Spanish Ministry for Science and Innovation through the Maria de Maeztu programme for Units of Excellence in RD [CEX2018-000805-M]
Lattice resonances, the collective modes supported by periodic arrays of metallic nanoparticles, give rise to very strong and spectrally narrow optical responses. Thanks to these properties, which emerge from the coherent multiple scattering enabled by the periodic ordering of the array, lattice resonances are used in a variety of applications such as nanoscale lasing and biosensing. Here, we investigate the lattice resonances supported by bipartite nanoparticle arrays. We find that, depending on the relative position of the two particles within the unit cell, these arrays can support lattice resonances with a super- or subradiant character. While the former result in large values of reflectance with broad lineshapes due to the increased radiative losses, the latter give rise to very small linewidths and maximum absorbance, consistent with a reduction of the radiative losses. Furthermore, by analyzing the response of arrays with finite dimensions, we demonstrate that the subradiant lattice resonances of bipartite arrays require a much smaller number of elements to reach a given quality factor than the lattice resonances of arrays with single-particle unit cells. The results of this work, in addition to advancing our knowledge of the optical response of periodic arrays of nanostructures, provide an eff icient approach to obtain narrow lattice resonances that are robust to fabrication imperfections.
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