ArticleNanophotonics (Berlin, Germany)2024
Ultrafast snapshots of terahertz electric potentials across ring-shaped quantum barriers.
Article in Nanophotonics (Berlin, Germany), 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Beyond limits: a tribute to Dai-Sik Kim's academic legacy and vision.Nanophotonics (Berlin, Germany) · 2025Article
- Editorial on special issue "Metamaterials and Plasmonics in Asia".Nanophotonics (Berlin, Germany) · 2024Article
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Authors and funding
5 authors.
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Abstract
Probing the time evolution of the terahertz electric field within subwavelength dimensions plays a crucial role in observing the nanoscale lightwave interactions with fundamental excitations in condensed-matter systems and in artificial structures, such as metamaterials. Here, we propose a novel probing method for measuring terahertz electric potentials across nanogaps using a combination of optical and terahertz pulse excitations. To achieve this, we employ ring-shaped nanogaps that enclose a metallic island, allowing us to capture tunneling charges when subjected to terahertz electromagnetic pulse illumination. By controlling and manipulating the terahertz tunneling charges through a focused optical gate pulse, we can obtain the terahertz potential strength as a function of spatial coordinates and time delays between pulses. To accurately quantify the time evolution of terahertz electric potential across quantum barriers, we carefully calibrate the recorded nonlinear tunneling current. Its on-resonance and off-resonance behaviors are also discussed, providing valuable insights into the antenna's characteristics and performance.
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