Publication detail

Spatially resolved electron energy loss spectroscopy of crescent-shaped plasmonic antennas

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

English Title

Spatially resolved electron energy loss spectroscopy of crescent-shaped plasmonic antennas

Type

journal article in Web of Science

Language

en

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.

English 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

RIV year

2015

Released

27.04.2015

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",
  annote="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.",
  chapter="114464",
  doi="10.1364/OE.23.011855",
  number="9",
  volume="23",
  year="2015",
  month="april",
  pages="11855--11867",
  type="journal article in Web of Science"
}