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Probing the limits of plasmonic enhancement using a two-dimensional atomic crystal probe 被引量:7

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摘要 Achieving larger electromagnetic enhancement using a nanogap between neighboring metallic nanostructures has been long pursued for boosting light–matter interactions.However,the quantitative probing of this enhancement is hindered by the lack of a reliable experimental method for measuring the local fields within a subnanometer gap.Here,we use layered MoS2 as a two-dimensional atomic crystal probe in nanoparticle-on-mirror nanoantennas to measure the plasmonic enhancement in the gap by quantitative surface-enhanced Raman scattering.Our designs ensure that the probe filled in the gap has a well-defined lattice orientation and thickness,enabling independent extraction of the anisotropic field enhancements.We find that the field enhancement can be safely described by pure classical electromagnetic theory when the gap distance is no<1.24 nm.For a 0.62 nm gap,the probable emergence of quantum mechanical effects renders an average electric field enhancement of 114-fold,38.4%lower than classical predictions.
出处 《Light(Science & Applications)》 SCIE EI CAS CSCD 2018年第1期500-510,共11页 光(科学与应用)(英文版)
基金 supported by the National Key Basic Research Program(Grant No.2015CB932400) the National Key R&D Program of China(Grant Nos.2017YFA0303504 and 2017YFA0205800) the National Natural Science Foundation of China(Grant Nos.11304233,11674256,11674255,and 11404247) the China Postdoctoral Science Foundation(Grant No.2014T70727).
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