Details
| Original language | English |
|---|---|
| Pages (from-to) | 1038-1043 |
| Number of pages | 6 |
| Journal | Optica |
| Volume | 4 |
| Issue number | 9 |
| Publication status | Published - 20 Sept 2017 |
Abstract
Plasmonic dimer nanoantennas can significantly boost the electric field strength in the gap region, allowing for a modification of the feed gap geometry by femtosecond laser illumination. Using resonant bowtie antennas to enhance the electric field of a low-fluence femtosecond oscillator, here we experimentally demonstrate highly localized reshaping of the antennas, resulting in a self-optimization of the antenna shape. From high-resolution scanning electron micrographs and two-dimensional energy dispersive x-ray maps, we analyze the near-field enhanced subwavelength ablation at the nanotips and the resulting deposition of ablated materials in the feed gap. The dominant ablation mechanism is attributed to the nonthermal transient unbonding of atoms and electrostatic acceleration of ions. This process is driven by surface plasmon enhanced electron emission, with subsequent acceleration in the vacuum. This ablation is impeded in the presence of an ambient gas. A maximum of sixfold enhancement of the third-harmonic yield is observed during the reshaping process.
Keywords
- Harmonic generation and mixing, Nonlinear optics at surfaces, Subwavelength structures, nanostructures, Surface plasmons
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Optica, Vol. 4, No. 9, 20.09.2017, p. 1038-1043.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Self-optimization of plasmonic nanoantennas in strong femtosecond fields
AU - Shi, Liping
AU - Iwan, Bianca
AU - Nicolas, Rana
AU - Ripault, Quentin
AU - Andrade, Jose R.C.
AU - Han, Seunghwoi
AU - Kim, Hyunwoong
AU - Boutu, Willem
AU - Franz, Dominik
AU - Heidenblut, Torsten
AU - Reinhardt, Carsten
AU - Bastiaens, Bert
AU - Nagy, Tamas
AU - Babushkin, Ihar
AU - Morgner, Uwe
AU - Kim, Seung Woo
AU - Steinmeyer, Günter
AU - Merdji, Hamed
AU - Kovacev, Milutin
PY - 2017/9/20
Y1 - 2017/9/20
N2 - Plasmonic dimer nanoantennas can significantly boost the electric field strength in the gap region, allowing for a modification of the feed gap geometry by femtosecond laser illumination. Using resonant bowtie antennas to enhance the electric field of a low-fluence femtosecond oscillator, here we experimentally demonstrate highly localized reshaping of the antennas, resulting in a self-optimization of the antenna shape. From high-resolution scanning electron micrographs and two-dimensional energy dispersive x-ray maps, we analyze the near-field enhanced subwavelength ablation at the nanotips and the resulting deposition of ablated materials in the feed gap. The dominant ablation mechanism is attributed to the nonthermal transient unbonding of atoms and electrostatic acceleration of ions. This process is driven by surface plasmon enhanced electron emission, with subsequent acceleration in the vacuum. This ablation is impeded in the presence of an ambient gas. A maximum of sixfold enhancement of the third-harmonic yield is observed during the reshaping process.
AB - Plasmonic dimer nanoantennas can significantly boost the electric field strength in the gap region, allowing for a modification of the feed gap geometry by femtosecond laser illumination. Using resonant bowtie antennas to enhance the electric field of a low-fluence femtosecond oscillator, here we experimentally demonstrate highly localized reshaping of the antennas, resulting in a self-optimization of the antenna shape. From high-resolution scanning electron micrographs and two-dimensional energy dispersive x-ray maps, we analyze the near-field enhanced subwavelength ablation at the nanotips and the resulting deposition of ablated materials in the feed gap. The dominant ablation mechanism is attributed to the nonthermal transient unbonding of atoms and electrostatic acceleration of ions. This process is driven by surface plasmon enhanced electron emission, with subsequent acceleration in the vacuum. This ablation is impeded in the presence of an ambient gas. A maximum of sixfold enhancement of the third-harmonic yield is observed during the reshaping process.
KW - Harmonic generation and mixing
KW - Nonlinear optics at surfaces
KW - Subwavelength structures, nanostructures
KW - Surface plasmons
UR - http://www.scopus.com/inward/record.url?scp=85029821741&partnerID=8YFLogxK
U2 - 10.1364/OPTICA.4.001038
DO - 10.1364/OPTICA.4.001038
M3 - Article
AN - SCOPUS:85029821741
VL - 4
SP - 1038
EP - 1043
JO - Optica
JF - Optica
SN - 2334-2536
IS - 9
ER -