Relative spectral tuning of the vertical versus base modes in plasmonic nanocones

Abstract : Gold nanocones acting as optical antennas offer an excellent geometry for focusing light near the cone tip, acting as nano-light sources with spot sizes on the order of the tip radius. However only the vertical plasmon mode oscillating in the axial direction can effectively excite the tip, whereas lateral modes oscillating along the cone base create mostly unwanted background in applications. The present work investigates the three-dimensional plasmonic mode structure of nanocones both experimentally and numerically. By tuning the nanocone aspect ratio, the modes can be spectrally tuned relative to each other, making them coincide for maximum excitation, or tuning the base mode away from the vertical mode for effective background suppression.
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https://hal-utt.archives-ouvertes.fr/hal-02311002
Contributor : Jean-Baptiste Vu Van <>
Submitted on : Thursday, October 10, 2019 - 4:00:20 PM
Last modification on : Friday, October 11, 2019 - 1:31:03 AM

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Julia Fulmes, Christian Schäfer, Dieter Kern, Pierre-Michel Adam, Monika Fleischer. Relative spectral tuning of the vertical versus base modes in plasmonic nanocones. Nanotechnology, Institute of Physics, 2019, 30 (41), pp.415201. ⟨10.1088/1361-6528/ab2d5c⟩. ⟨hal-02311002⟩

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