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

Journal article


Publication Details

Author(s): Lehr M, Bley K, Vogel N, Rethfeld B, Schönhense G, Elmers HJ
Journal: Journal of Physical Chemistry C
Publication year: 2019
Volume: 123
Journal issue: 19
Pages range: 12429-12436
ISSN: 1932-7447
eISSN: 1932-7455


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.


FAU Authors / FAU Editors

Bley, Karina Dr.
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Vogel, Nicolas Prof. Dr.
Professur für Partikelsynthese


External institutions with authors

Johannes Gutenberg-Universität Mainz
Technische Universität Kaiserslautern


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.

BibTeX: 

Last updated on 2019-06-08 at 09:06