ArticleNanophotonics (Berlin, Germany)2022
Beyond-hot-spot absorption enhancement on top of terahertz nanotrenches.
Article in Nanophotonics (Berlin, Germany), 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Beyond limits: a tribute to Dai-Sik Kim's academic legacy and vision.Nanophotonics (Berlin, Germany) · 2025Article
- Enhanced terahertz magneto-plasmonic effect enabled by epsilon-near-zero iron slot antennas.Nanophotonics (Berlin, Germany) · 2025Article
- Suppressed terahertz dynamics of water confined in nanometer gaps.Science advances · 2024Article
- Strain versus Tunable Terahertz Nanogap Width: A Simple Formula and a Trench below.Nanomaterials (Basel, Switzerland) · 2023Article
- Terahertz virus-sized gold nanogap sensor.Nanophotonics (Berlin, Germany) · 2023Article
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Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Metallic nanogaps are being widely used for sensing applications, owing to their ability to confine and enhance electromagnetic field within the hot spots. Since the enhanced field does not confine itself perfectly within the gap, however, fringe fields well away from the gap are of potential use as well in real systems. Here, we extend the concept of near field absorption enhancement by quantitatively analyzing terahertz absorption behavior of water molecules outside the hot spots of sub-20 nm-wide, ∼100 μm-long nanotrenches. Contrary to point-gaps which show negligible field enhancement at distances larger than the gap width, our extended nanogap act as a line source, incorporating significant amount of absorption enhancement at much longer distances. We observe absorption enhancement factors of up to 3600 on top of a 5 nm-wide gap, and still well over 300 at 15 nm away. The finding is well supported by theoretical analyses including modal expansion calculations, Kirchhoff integral formalism and antenna theory. Our results provide means to quantitatively analyze light-matter interactions beyond the hot spot picture and enable application of nanogaps for sensitive surface analyses of various material systems.
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