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Probing the limits of plasmonic enhancement using a two-dimensional atomic crystal probe
Wen Chen1, Shunping Zhang1, Meng Kang1
11School of Physics and Technology, Center for Nanoscience and Nanotechnology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan, 430072 China.
Light, Science & Applications
|March 7, 2019
Summary
Researchers measured plasmonic enhancement in nanogaps using layered molybdenum disulfide (MoS2) as a probe. Quantum effects were observed at 0.62 nm gaps, showing lower field enhancement than classical predictions.
Area of Science:
- Nanophotonics
- Plasmonics
- Materials Science
Background:
- Subnanometer gaps in metallic nanostructures are crucial for electromagnetic enhancement.
- Measuring local fields in these gaps is experimentally challenging.
- Existing methods lack reliability for quantitative probing.
Purpose of the Study:
- To develop a reliable experimental method for measuring plasmonic enhancement in nanogaps.
- To probe local electromagnetic fields within subnanometer gaps.
- To investigate the transition from classical to quantum electromagnetic effects.
Main Methods:
- Utilized nanoparticle-on-mirror nanoantennas with layered molybdenum disulfide (MoS2) as a 2D atomic crystal probe.
- Employed quantitative surface-enhanced Raman scattering (SERS) to measure plasmonic enhancement.
- Designed probes with well-defined lattice orientation and thickness for anisotropic field extraction.
Main Results:
- Demonstrated MoS2 as an effective probe for quantitative SERS measurements in nanogaps.
- Classical electromagnetic theory accurately describes field enhancement for gap distances >1.24 nm.
- Observed a 38.4% lower average electric field enhancement at a 0.62 nm gap compared to classical predictions, indicating quantum effects.
Conclusions:
- Layered MoS2 enables precise measurement of plasmonic enhancement in nanogaps.
- Quantum mechanical effects become significant at subnanometer gap distances.
- The findings provide critical insights into light-matter interactions at the nanoscale.
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