期刊
ADVANCED SCIENCE
卷 8, 期 11, 页码 -出版社
WILEY
DOI: 10.1002/advs.202004826
关键词
nanoparticles; nanophotonics and plasmonics; nanoscale electrical tweezers; optical biosensors; terahertz optics
资金
- KIST intramural Grant [2E31251, 2E31253, 2E30271]
- Joint research lab program of the National Agenda research division, KIST
- National Research Foundation of Korea (NRF) [NRF-2020M3H5A1081103, NRF-2020R1A2C2007077, CAMM-2019M3A6B3030638]
- National Research Foundation of Korea [4199990113881, 5199990214654, 2E31250] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Vertically aligned nanogap-hybridized metasurfaces can efficiently trap traveling nanoparticles in the sensing region, enabling the real-time monitoring of nanoparticle assemblies in liquids. This approach, together with electric tweezing via optical hotspots, shows promise for underwater THz analysis and understanding physicochemical events within a broad wavelength regime.
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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