AI Article Synopsis
- Plasmonic tip nanofocusing is crucial for various applications like spectroscopy and optical trapping due to its ability to boost local electric fields.
- A new substrate design featuring a circular nanocavity enhances the focusing and trapping capabilities significantly when illuminated with a focused radial polarized beam.
- This method improves the gap-plasmon mode's electric field intensity tenfold and enables stable trapping of tiny nanoparticles, paving the way for advanced techniques in characterizing and manipulating single nanoparticles.
Article Abstract
Plasmonic tip nanofocusing has widely been applied in tip-enhanced Raman spectroscopy, optical trapping, nonlinear optics, and super-resolution imaging due to its capability of high local field enhancement. In this work, a substrate with a circular nanocavity is proposed to enhance the nanofocusing and optical trapping characteristics of the plasmonic tip. Under axial illumination of a tightly focused radial polarized beam, the circular nanohole etched on a metallic substrate can form a nanocavity to induce an interference effect and further enhance the electric field intensity. When a plasmonic tip is placed closely above such a substrate, the electric field intensity of the gap-plasmon mode can further be improved, which is 10 folds stronger than that of the conventional gap-plasmon mode. Further analysis reveals that the enhanced gap-plasmon mode can significantly strengthen the optical force exerted on a nanoparticle and stably trap a 4-nm-diameter dielectric nanoparticle. Our proposed method can improve the performance of tip-enhanced spectroscopy, plasmonic tweezers and extend their applications. We anticipate that our methods allow simultaneously manipulating and characterizing single nanoparticles in-situ.
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| http://dx.doi.org/10.1364/OE.441689 | DOI Listing |
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