Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 142, Issue 43, Pages 18304-18309Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c07140
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Funding
- Gordon and Betty Moore Foundation through a Moore Inventors Fellowship [6881]
- National Science Foundation [1905209]
- National Defense Science and Engineering
- Swiss National Science Foundation [P2EZP2_181595]
- National Science Foundation as part of the National Nanotechnology Coordinated Infrastructure [ECCS-1542152]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1905209] Funding Source: National Science Foundation
- Swiss National Science Foundation (SNF) [P2EZP2_181595] Funding Source: Swiss National Science Foundation (SNF)
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Strong enhancement of molecular circular dichroism (CD) has the potential to enable efficient asymmetric photolysis, a method of chiral separation that has conventionally been impeded by insufficient yield and low enantiomeric excess. Here, we study experimentally how predicted enhancements in optical chirality density near resonant silicon nanodisks boost CD. We use fluorescence-detected circular dichroism (FDCD) spectroscopy to measure indirectly the differential absorption of circularly polarized light by a monolayer of optically active molecules functionalized to silicon nanodisk arrays. Importantly, the molecules and nanodisk antennas have spectrally coincident resonances, and our fluorescence technique allows us to deconvolute absorption in the nanodisks from the molecules. We find that enhanced FDCD signals depend on nanophotonic resonances, in good agreement with simulated differential absorption and optical chirality density, while no signal is detected from molecules adsorbed on featureless silicon surfaces. These results verify the potential of nanophotonic platforms to be used for asymmetric photolysis with lower energy requirements.
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