Evidence of Spatially Inhomogeneous Electron Temperature in a Resonantly Excited Array of Bow-Tie Nanoantennas

Lehr M, Bley K, Vogel N, Rethfeld B, Schönhense G, Elmers HJ (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Journal of Physical Chemistry C American Chemical Society

Book Volume: 123

Pages Range: 12429-12436

Journal Issue: 19

DOI: 10.1021/acs.jpcc.9b03722

Abstract

We studied the excitation of large-area Au bow-tie nanoantenna arrays, which we have fabricated on indium-tin-oxide (ITO)-coated glass substrates using colloidal lithography with nanoscale polystyrene colloidal particles. Ultrashort (100 fs, 800 nm) laser pulses of a Ti-Sapphire laser resonantly excite electron emission from a few tens of nanometer wide-gap regions of the array. We investigated the near-field enhanced photoemission using time-of-flight momentum microscopy. The variation of the electron emission intensity as a function of kinetic energy, parallel momentum, power density, and polarization of the laser beam reveals two distinct emission mechanisms: a coherent multiphoton photoemission process from the optically heated electron gas and a field emission process resulting from the optical near-field enhancement at the nanoantenna tips. The analysis of the momentum-resolved kinetic energy spectra indicates a spatially inhomogeneous distribution of the electron gas temperature within the bow-tie resonators.

Authors with CRIS profile

Karina Bley Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Nicolas Vogel Professur für Partikelsynthese

Involved external institutions

Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) Technische Universität Kaiserslautern DE Germany (DE)

How to cite

APA:

Lehr, M., Bley, K., Vogel, N., Rethfeld, B., Schönhense, G., & Elmers, H.J. (2019). Evidence of Spatially Inhomogeneous Electron Temperature in a Resonantly Excited Array of Bow-Tie Nanoantennas. Journal of Physical Chemistry C, 123(19), 12429-12436. https://dx.doi.org/10.1021/acs.jpcc.9b03722

MLA:

Lehr, Martin, et al. "Evidence of Spatially Inhomogeneous Electron Temperature in a Resonantly Excited Array of Bow-Tie Nanoantennas." Journal of Physical Chemistry C 123.19 (2019): 12429-12436.

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