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KŘÁPEK, V. KOH, A. BŘÍNEK, L. HRTOŇ, M. TOMANEC, O. KALOUSEK, R. MAIER, S. ŠIKOLA, T.
Original Title
Spatially resolved electron energy loss spectroscopy of crescent-shaped plasmonic antennas
Type
journal article in Web of Science
Language
English
Original Abstract
We present a study of the optical properties of gold crescent-shaped antennas by means of electron energy loss spectroscopy. These structures exhibit particularly large field enhancement near their sharp features, support two non-degenerate dipolar (i.e., optically active) localised surface plasmon resonances, and are widely tunable by a choice of their shape and dimensions. Depending on the volume and shape, we resolved up to four plasmon resonances in metallic structures under study in the energy range of 0.8 - 2.4 eV: two dipolar and quadrupolar mode and a multimodal assembly. The boundary-element-method calculations reproduced the observed spectra and helped to identify the character of the resonances. The two lowest modes are of particular importance owing to their dipolar nature. Remarkably, they are both concentrated near the tips of the crescent, spectrally well resolved and their energies can be tuned between 0.8 - 1.5 eV and 1.2 - 2.0 eV, respectively. As the lower spectral range covers the telecommunication wavelengths 1.30 and 1.55 micro m, we envisage the possible use of such nanostructures in infrared communication technology.
Keywords
Nanomaterials; Surface plasmons; Plasmonics; Subwavelength structures, nanostructures
Authors
KŘÁPEK, V.; KOH, A.; BŘÍNEK, L.; HRTOŇ, M.; TOMANEC, O.; KALOUSEK, R.; MAIER, S.; ŠIKOLA, T.
RIV year
2015
Released
27. 4. 2015
ISBN
1094-4087
Periodical
OPTICS EXPRESS
Year of study
23
Number
9
State
United States of America
Pages from
11855
Pages to
11867
Pages count
13
BibTex
@article{BUT114464, author="Vlastimil {Křápek} and Ai Leen {Koh} and Lukáš {Břínek} and Martin {Hrtoň} and Ondřej {Tomanec} and Radek {Kalousek} and Stefan A. {Maier} and Tomáš {Šikola}", title="Spatially resolved electron energy loss spectroscopy of crescent-shaped plasmonic antennas", journal="OPTICS EXPRESS", year="2015", volume="23", number="9", pages="11855--11867", doi="10.1364/OE.23.011855", issn="1094-4087" }