Details
| Original language | English |
|---|---|
| Article number | 173102 |
| Journal | Applied Physics Letters |
| Volume | 111 |
| Issue number | 17 |
| Publication status | Published - 24 Oct 2017 |
Abstract
We propose to use diabolo nanoantennas for experimentally investigating the origin of the enhanced third harmonic generation by localized surface plasmon polaritons. In such a geometry, the opposing apexes of bowties are electrically connected by a thin gold nanorod, which has two important functions in discriminating the point of harmonic generation. First, the inserted gold nanorod shifts the field enhancement area to be far away from the dielectric substrate material. Next, the accumulation of free charges at the adjacent bowtie tips produces a strong electric field inside the gold nanorod. The diabolo nanoantennas allow us to examine the contribution of the bare gold susceptibility to the third harmonic conversion. Our results reveal that the bare gold does not significantly enhance the harmonic generation at high pump intensity. From this, we deduce that in regular bowtie antennas, the enhanced harmonic photons mainly arise from the substrate sapphire that is located in the feedgap of the bowtie, where the electric near-field is significantly enhanced by the localized surface plasmons.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)
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In: Applied Physics Letters, Vol. 111, No. 17, 173102, 24.10.2017.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigating the origin of third harmonic generation from diabolo optical antennas
AU - Shi, Liping
AU - Andrade, José R.C.
AU - Kim, Hyunwoong
AU - Han, Seunghwoi
AU - Nicolas, Rana
AU - Franz, Dominik
AU - Boutu, Willem
AU - Heidenblut, Torsten
AU - Segerink, Frans B.
AU - Bastiaens, Bert
AU - Merdji, Hamed
AU - Kim, Seung Woo
AU - Morgner, Uwe
AU - Kovačev, Milutin
N1 - Funding information: We would like to thank the funding support from the Deutsche Forschungsgemeinschaft (DFG) under grant number KO 3798/4-1, from the Centre for Quantum Engineering and Space-Time Research (QUEST), from Lower Saxony through “Quanten-und Nanometrologie” (QUANOMET, project Nanophotonik), from the National Research Foundation of the Republic of Korea (NRF-2012R1A3A1050386), from the ANR under the Grant IPEX (2014), and from the LABEX PALM (ANR-10-LABX-0039) under the Grants Plasmon-X (2014) and HILAC (2015).
PY - 2017/10/24
Y1 - 2017/10/24
N2 - We propose to use diabolo nanoantennas for experimentally investigating the origin of the enhanced third harmonic generation by localized surface plasmon polaritons. In such a geometry, the opposing apexes of bowties are electrically connected by a thin gold nanorod, which has two important functions in discriminating the point of harmonic generation. First, the inserted gold nanorod shifts the field enhancement area to be far away from the dielectric substrate material. Next, the accumulation of free charges at the adjacent bowtie tips produces a strong electric field inside the gold nanorod. The diabolo nanoantennas allow us to examine the contribution of the bare gold susceptibility to the third harmonic conversion. Our results reveal that the bare gold does not significantly enhance the harmonic generation at high pump intensity. From this, we deduce that in regular bowtie antennas, the enhanced harmonic photons mainly arise from the substrate sapphire that is located in the feedgap of the bowtie, where the electric near-field is significantly enhanced by the localized surface plasmons.
AB - We propose to use diabolo nanoantennas for experimentally investigating the origin of the enhanced third harmonic generation by localized surface plasmon polaritons. In such a geometry, the opposing apexes of bowties are electrically connected by a thin gold nanorod, which has two important functions in discriminating the point of harmonic generation. First, the inserted gold nanorod shifts the field enhancement area to be far away from the dielectric substrate material. Next, the accumulation of free charges at the adjacent bowtie tips produces a strong electric field inside the gold nanorod. The diabolo nanoantennas allow us to examine the contribution of the bare gold susceptibility to the third harmonic conversion. Our results reveal that the bare gold does not significantly enhance the harmonic generation at high pump intensity. From this, we deduce that in regular bowtie antennas, the enhanced harmonic photons mainly arise from the substrate sapphire that is located in the feedgap of the bowtie, where the electric near-field is significantly enhanced by the localized surface plasmons.
UR - http://www.scopus.com/inward/record.url?scp=85032387595&partnerID=8YFLogxK
U2 - 10.1063/1.5001005
DO - 10.1063/1.5001005
M3 - Article
AN - SCOPUS:85032387595
VL - 111
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 17
M1 - 173102
ER -