Tracking optical welding through groove modes in plasmonic nanocavities

J. Mertens, A. Demetriadou, R. W. Bowman, F. Benz, M.-E. Kleemann, C. Tserkezis, Y. Shi, H. Y. Yang, O. Hess, J. Aizpurua, J. J. Baumberg

Research output: Contribution to journalArticle

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Abstract

We report the light-induced formation of conductive links across nanometer-wide insulating gaps. These are realized by incorporating spacers of molecules or 2D monolayers inside a gold plasmonic nanoparticle-on-mirror (NPoM) geometry. Laser irradiation of individual NPoMs controllably reshapes and tunes the plasmonic system, in some cases forming conductive bridges between particle and substrate, which shorts the nanometer-wide plasmonic gaps geometrically and electronically. Dark-field spectroscopy monitors the bridge formation in situ, revealing strong plasmonic mode mixing dominated by clear anticrossings. Finite difference time domain simulations confirm this spectral evolution, which gives insights into the metal filament formation. A simple analytic cavity model describes the observed plasmonic mode hybridization between tightly confined plasmonic cavity modes and a radiative antenna mode sustained in the NPoM. Our results show how optics can reveal the properties of electrical transport across well-defined metallic nanogaps to study and develop technologies such as resistive memory devices (memristors).
Original languageEnglish
Pages (from-to)5605-5611
Number of pages7
JournalNano Letters
Volume16
Issue number9
Early online date16 Aug 2016
DOIs
Publication statusPublished - 14 Sep 2016

Cite this

Mertens, J., Demetriadou, A., Bowman, R. W., Benz, F., Kleemann, M-E., Tserkezis, C., ... Baumberg, J. J. (2016). Tracking optical welding through groove modes in plasmonic nanocavities. Nano Letters, 16(9), 5605-5611. https://doi.org/10.1021/acs.nanolett.6b02164

Tracking optical welding through groove modes in plasmonic nanocavities. / Mertens, J.; Demetriadou, A.; Bowman, R. W.; Benz, F.; Kleemann, M.-E.; Tserkezis, C.; Shi, Y.; Yang, H. Y.; Hess, O.; Aizpurua, J.; Baumberg, J. J.

In: Nano Letters, Vol. 16, No. 9, 14.09.2016, p. 5605-5611.

Research output: Contribution to journalArticle

Mertens, J, Demetriadou, A, Bowman, RW, Benz, F, Kleemann, M-E, Tserkezis, C, Shi, Y, Yang, HY, Hess, O, Aizpurua, J & Baumberg, JJ 2016, 'Tracking optical welding through groove modes in plasmonic nanocavities', Nano Letters, vol. 16, no. 9, pp. 5605-5611. https://doi.org/10.1021/acs.nanolett.6b02164
Mertens J, Demetriadou A, Bowman RW, Benz F, Kleemann M-E, Tserkezis C et al. Tracking optical welding through groove modes in plasmonic nanocavities. Nano Letters. 2016 Sep 14;16(9):5605-5611. https://doi.org/10.1021/acs.nanolett.6b02164
Mertens, J. ; Demetriadou, A. ; Bowman, R. W. ; Benz, F. ; Kleemann, M.-E. ; Tserkezis, C. ; Shi, Y. ; Yang, H. Y. ; Hess, O. ; Aizpurua, J. ; Baumberg, J. J. / Tracking optical welding through groove modes in plasmonic nanocavities. In: Nano Letters. 2016 ; Vol. 16, No. 9. pp. 5605-5611.
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AB - We report the light-induced formation of conductive links across nanometer-wide insulating gaps. These are realized by incorporating spacers of molecules or 2D monolayers inside a gold plasmonic nanoparticle-on-mirror (NPoM) geometry. Laser irradiation of individual NPoMs controllably reshapes and tunes the plasmonic system, in some cases forming conductive bridges between particle and substrate, which shorts the nanometer-wide plasmonic gaps geometrically and electronically. Dark-field spectroscopy monitors the bridge formation in situ, revealing strong plasmonic mode mixing dominated by clear anticrossings. Finite difference time domain simulations confirm this spectral evolution, which gives insights into the metal filament formation. A simple analytic cavity model describes the observed plasmonic mode hybridization between tightly confined plasmonic cavity modes and a radiative antenna mode sustained in the NPoM. Our results show how optics can reveal the properties of electrical transport across well-defined metallic nanogaps to study and develop technologies such as resistive memory devices (memristors).

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