Journal
NANOSCALE
Volume 13, Issue 21, Pages 9606-9614Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nr01442k
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Funding
- Laboratory Directed Research and Development program of Los Alamos National Laboratory [20190516ECR, 20210036DR]
- National Security Education Center [IMS RR19PETT, IMS RR21PETT]
- U.S. Department of Energy's NNSA [89233218CNA000001]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Toyota Research Institute
- Department of Energy Early Career Research Award program
- U.S. National Science Foundation (NSF) [DMR 2005096]
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The study reveals the presence of robust chirality in the one-dimensional form of tellurium, leading to a circular-polarization dependent second harmonic generation response. The observations of 1D tellurium nanowire orientation variations obtained by 4D-STEM uncover this phenomenon and its correlation with unconventional non-linear optical properties.
Robust atomic-to-meso-scale chirality is now observed in the one-dimensional form of tellurium. This enables a large and counter-intuitive circular-polarization dependent second harmonic generation response above 0.2 which is not present in two-dimensional tellurium. Orientation variations in 1D tellurium nanowires obtained by four-dimensional scanning transmission electron microscopy (4D-STEM) and their correlation with unconventional non-linear optical properties by second harmonic generation circular dichroism (SHG-CD) uncovers an unexpected circular-polarization dependent SHG response from 1D nanowire bundles - an order-of-magnitude higher than in single-crystal two-dimensional tellurium structures - suggesting the atomic- and meso-scale crystalline structure of the 1D material possesses an inherent chirality not present in its 2D form; and which is strong enough to manifest even in the aggregate non-linear optical (NLO) properties of aggregates.
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