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    Large-Scale Sub-1-nm Random Gaps Approaching the Quantum Upper Limit for Quantitative Chemical Sensing

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    Type
    Article
    Authors
    Zhang, Nan
    Hu, Haifeng
    Singer, Matthew
    Li, Kuang-Hui cc
    Zhou, Lyu
    Ooi, Boon S. cc
    Gan, Qiaoqiang cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Material Science and Engineering
    Material Science and Engineering Program
    Photonics Laboratory
    Physical Science and Engineering (PSE) Division
    Date
    2020-10-27
    Embargo End Date
    2021-10-28
    Submitted Date
    2020-09-20
    Permanent link to this record
    http://hdl.handle.net/10754/665736
    
    Metadata
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    Abstract
    Metallic nanostructures with nanogap features can confine electromagnetic fields into extremely small volumes. In particular, as the gap size is scaled down to sub-nanometer regime, the quantum effects for localized field enhancement reveal the ultimate capability for light–matter interaction. Although the enhancement factor approaching the quantum upper limit has been reported, the grand challenge for surface-enhanced vibrational spectroscopic sensing remains in the inherent randomness, preventing uniformly distributed localized fields over large areas. Herein, a strategy to fabricate high-density random metallic nanopatterns with accurately controlled nanogaps, defined by atomic-layer-deposition and self-assembled-monolayer processes, is reported. As the gap size approaches the quantum regime of ≈0.78 nm, its potential for quantitative sensing, based on a record-high uniformity with the relative standard deviation of 4.3% over a large area of 22 mm × 60 mm, is demonstrated. This superior feature paves the way towards more affordable and quantitative sensing using quantum-limit-approaching nanogap structures.
    Citation
    Zhang, N., Hu, H., Singer, M., Li, K., Zhou, L., Ooi, B. S., & Gan, Q. (2020). Large-Scale Sub-1-nm Random Gaps Approaching the Quantum Upper Limit for Quantitative Chemical Sensing. Advanced Optical Materials, 2001634. doi:10.1002/adom.202001634
    Sponsors
    This work was partially supported by NSF CMMI-1562057 and ECCS-1807463. The authors appreciate Dr. Lingmei Liu and Prof. Yu Han at KAUST for helpful suggestions on TEM characterization.
    Publisher
    Wiley
    Journal
    Advanced Optical Materials
    DOI
    10.1002/adom.202001634
    10.1002/adom.202070095
    Additional Links
    https://onlinelibrary.wiley.com/doi/10.1002/adom.202001634
    ae974a485f413a2113503eed53cd6c53
    10.1002/adom.202001634
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Electrical and Computer Engineering Program; Material Science and Engineering Program; Photonics Laboratory; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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