Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 123, Issue 38, Pages 23620-23627Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b06556
Keywords
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Funding
- UNAM-PAPIIT [1A102117, IN107319, IN107318]
- CONACyT [INFR-2016-01-268414, INFR-2018-01-293349]
- innovational Research Incentives Scheme (Vici Grant) [680-47-628]
- PIIF-UNAM
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We investigate the chiro-optical properties of the electromagnetic near-field associated with the excitation of collective optical resonances (surface lattice resonances) in achiral plasmonic lattices. These arrays are specially designed to support dispersive resonances with nontrivial, multipolar near-field distributions in the surroundings of the nanostructure, which gives rise to an enhanced chiro-optical response. The presence of these multipolar resonances in lattices without explicitly broken mirror symmetry is experimentally confirmed by far-field extinction measurements, while the angular, spectral, and spatial dependence of the associated chiral near-field are numerically simulated. In contrast with typical pseudochiral systems, the extended chiro-optical near-field response appears even at normal incidence. We believe that surface lattice resonances in achiral plasmonic lattices can be potentially utilized as a substrate for enhanced background-free enantioselectivity and tunable chiral molecule recognition over large areas.
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