Abstract
We present numerical studies, nano-fabrication and optical characterization of bowtie nanoantennas demonstrating their superior performance with respect to the electric field enhancement as compared to other Au nanoparticle shapes. For optimized parameters, we found mean intensity enhancement factors >2300× in the feed-gap of the antenna, decreasing to 1300 × when introducing a 5nm titanium adhesion layer. Using electron beam lithography we fabricated gold bowties on various substrates with feed-gaps and tip radii as small as 10 nm. In polarization resolved measurement we experimentally observed a blue shift of the surface plasmon resonance from 1.72 eV to 1.35 eV combined with a strong modification of the electric field enhancement in the feed-gap. Under excitation with a 100 fs pulsed laser source, we observed non-linear light emission arising from two-photon photoluminescence and second harmonic generation from the gold. The bowtie nanoantenna shows a high potential for outstanding conversion efficiencies and the enhancement of other optical effects which could be exploited in future nanophotonic devices.
Original language | English |
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Title of host publication | Photonic and Phononic Properties of Engineered Nanostructures V |
Editors | Axel Scherer, Ali Adibi, Shawn-Yu Lin |
Publisher | SPIE |
ISBN (Electronic) | 9781628414615 |
DOIs | |
State | Published - 2015 |
Externally published | Yes |
Event | Photonic and Phononic Properties of Engineered Nanostructures V - San Francisco, United States Duration: 9 Feb 2015 → 12 Feb 2015 |
Publication series
Name | Proceedings of SPIE - The International Society for Optical Engineering |
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Volume | 9371 |
ISSN (Print) | 0277-786X |
ISSN (Electronic) | 1996-756X |
Conference
Conference | Photonic and Phononic Properties of Engineered Nanostructures V |
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Country/Territory | United States |
City | San Francisco |
Period | 9/02/15 → 12/02/15 |
Bibliographical note
Publisher Copyright:© 2015 SPIE.
Keywords
- bowtie
- electric field enhancement
- nanoantenna
- non-linear optics
- surface plasmon