Details
| Original language | English |
|---|---|
| Pages (from-to) | 1208-1214 |
| Number of pages | 7 |
| Journal | ACS Photonics |
| Volume | 5 |
| Issue number | 4 |
| Early online date | 8 Feb 2018 |
| Publication status | Published - 18 Apr 2018 |
Abstract
Under illumination of a Ti:sapphire femtosecond oscillator, amplification of third harmonic generation by subwavelength plasmonic apertures is observed. However, the harmonic yield efficiency decays rapidly over time. In this work we investigate the physical phenomena behind the temporal attenuation of the harmonic signal. From high-resolution scanning electron micrographs and two-dimensional energy dispersive X-ray maps, we conclude that the attenuation of the third harmonic is attributed to trapping of a low-density carbon layer inside the plasmonic apertures. Furthermore, we show that the profile of the carbon deposit follows the enhanced electric near-field distribution, which indicates that the carbon atoms are transported to the field hotspot by the plasmonically enhanced optical tweezer effect. From the measurement of linear transmission spectra, we find that the dielectric constant inside the nanoholes is increased by the carbon deposit. However, numerical simulations demonstrate that the increase of dielectric constant does not reduce the electric near-field enhancement factor. Therefore, the decay of third harmonic radiation is primarily due to the strong reabsorption by the carbon deposit inside the gold-free aperture.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Biochemistry, Genetics and Molecular Biology(all)
- Biotechnology
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Engineering(all)
- Electrical and Electronic Engineering
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In: ACS Photonics, Vol. 5, No. 4, 18.04.2018, p. 1208-1214.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Impact of Plasmon-Induced Atoms Migration in Harmonic Generation
AU - Shi, Liping
AU - Nicolas, Rana
AU - Andrade, Jose R.C.
AU - Boutu, Willem
AU - Franz, Dominik
AU - Heidenblut, Torsten
AU - Reinhardt, Carsten
AU - Morgner, Uwe
AU - Merdji, Hamed
AU - Kovacev, Milutin
PY - 2018/4/18
Y1 - 2018/4/18
N2 - Under illumination of a Ti:sapphire femtosecond oscillator, amplification of third harmonic generation by subwavelength plasmonic apertures is observed. However, the harmonic yield efficiency decays rapidly over time. In this work we investigate the physical phenomena behind the temporal attenuation of the harmonic signal. From high-resolution scanning electron micrographs and two-dimensional energy dispersive X-ray maps, we conclude that the attenuation of the third harmonic is attributed to trapping of a low-density carbon layer inside the plasmonic apertures. Furthermore, we show that the profile of the carbon deposit follows the enhanced electric near-field distribution, which indicates that the carbon atoms are transported to the field hotspot by the plasmonically enhanced optical tweezer effect. From the measurement of linear transmission spectra, we find that the dielectric constant inside the nanoholes is increased by the carbon deposit. However, numerical simulations demonstrate that the increase of dielectric constant does not reduce the electric near-field enhancement factor. Therefore, the decay of third harmonic radiation is primarily due to the strong reabsorption by the carbon deposit inside the gold-free aperture.
AB - Under illumination of a Ti:sapphire femtosecond oscillator, amplification of third harmonic generation by subwavelength plasmonic apertures is observed. However, the harmonic yield efficiency decays rapidly over time. In this work we investigate the physical phenomena behind the temporal attenuation of the harmonic signal. From high-resolution scanning electron micrographs and two-dimensional energy dispersive X-ray maps, we conclude that the attenuation of the third harmonic is attributed to trapping of a low-density carbon layer inside the plasmonic apertures. Furthermore, we show that the profile of the carbon deposit follows the enhanced electric near-field distribution, which indicates that the carbon atoms are transported to the field hotspot by the plasmonically enhanced optical tweezer effect. From the measurement of linear transmission spectra, we find that the dielectric constant inside the nanoholes is increased by the carbon deposit. However, numerical simulations demonstrate that the increase of dielectric constant does not reduce the electric near-field enhancement factor. Therefore, the decay of third harmonic radiation is primarily due to the strong reabsorption by the carbon deposit inside the gold-free aperture.
UR - http://www.scopus.com/inward/record.url?scp=85045567793&partnerID=8YFLogxK
U2 - 10.1021/acsphotonics.7b01560
DO - 10.1021/acsphotonics.7b01560
M3 - Article
AN - SCOPUS:85045567793
VL - 5
SP - 1208
EP - 1214
JO - ACS Photonics
JF - ACS Photonics
SN - 2330-4022
IS - 4
ER -