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18 December 2019 Ultra-smooth silver nanoneedles as nanofocusing waveguides
Pan Li, Zhipeng Li
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Proceedings Volume 11336, AOPC 2019: Nanophotonics; 113360A (2019) https://doi.org/10.1117/12.2543494
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China
Abstract
Tapered metallic nanostructures can channel and focus surface plasmons to the sharp apex to generate enormous near field enhancement. This distinct feature enables light guiding and manipulating at nanoscale confinement, which have been widely applied on high-resolution near-field optical imaging, high-order harmonic generation enhancement and ultrasensitive detection, etc. In this paper, we shown that silver nanoneedles with high aspect rate and ultra-smooth surface can be utilized as on-chip plasmonic nanofocusing waveguides operated at visible region. The nanoneedles were synthesized through a focused optical field induced chemical process. Verified by the observation of non-uniform plasmon beats, we shown that these nanoneedles are excellent nanofocusing waveguides with divergent effective refractive index for plasmon propagating modes. These findings would be beneficial for the development of remote-excitation detection/sensing and plasmonic circuits constructing, etc.
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Pan Li and Zhipeng Li "Ultra-smooth silver nanoneedles as nanofocusing waveguides", Proc. SPIE 11336, AOPC 2019: Nanophotonics, 113360A (18 December 2019); https://doi.org/10.1117/12.2543494
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KEYWORDS
Plasmons
Waveguides
Surface plasmons
Nanostructures
Plasmonics
Near field
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