Nanoscale Terahertz Monitoring on Multiphase Dynamic Assembly of Nanoparticles under Aqueous Environment
- Authors
- Yu, Eui-Sang; Lee, Sang-Hun; Lee, Geon; Park, Q-Han; Chung, Aram J.; Seo, Minah; Ryu, Yong-Sang
- Issue Date
- Jun-2021
- Publisher
- WILEY
- Keywords
- nanoparticles; nanophotonics and plasmonics; nanoscale electrical tweezers; optical biosensors; terahertz optics
- Citation
- ADVANCED SCIENCE, v.8, no.11
- Journal Title
- ADVANCED SCIENCE
- Volume
- 8
- Number
- 11
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/19024
- DOI
- 10.1002/advs.202004826
- ISSN
- 2198-3844
- Abstract
- Probing the kinetic evolution of nanoparticle (NP) growth in liquids is essential for understanding complex nano-phases and their corresponding functions. Terahertz (THz) sensing, an emerging technology for next-generation laser photonics, has been developed with unique photonic features, including label-free, non-destructive, and molecular-specific spectral characteristics. Recently, metasurface-based sensing platforms have helped trace biomolecules by overcoming low THz absorption cross-sectional limits. However, the direct probing of THz signals in aqueous environments remains difficult. Here, the authors report that vertically aligned nanogap-hybridized metasurfaces can efficiently trap traveling NPs in the sensing region, thus enabling us to monitor the real-time kinetic evolution of NP assemblies in liquids. The THz photonics approach, together with an electric tweezing technique via spatially matching optical hotspots to particle trapping sites with a nanoscale spatial resolution, is highly promising for underwater THz analysis, forging a route toward unraveling the physicochemical events of nature within an ultra-broadband wavelength regime.
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Collections - Department of Optical Engineering > 1. Journal Articles
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