Journal
OPTICS EXPRESS
Volume 23, Issue 24, Pages 31460-31471Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.031460
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Funding
- NanoLund
- Swedish Research Council (VR)
- Swedish Foundation for Strategic Research (SSF)
- Crafoord Foundation
- Knut and Alice Wallen-berg Foundation
- European Research Council (ERC) start-up grant ElectronOpera
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Metal nanostructures can transfer electromagnetic energy from femtosecond laser pulses to the near-field down to spatial scales well below the optical diffraction limit. By combining few-femtosecond laser pulses with photoemission electron microscopy, we study the dynamics of the induced few-cycle near-field in individual bowtie nanoantennas. We investigate how the dynamics depend on antenna size and exact bowtie shape resulting from fabrication. Different dynamics are, as expected, measured for antennas of different sizes. However, we also detect comparable dynamics differences between individual antennas of similar size. With Finite-difference time-domain simulations we show that these dynamics differences between similarly sized antennas can be due to small lateral shape variations generally induced during the fabrication. (C) 2015 Optical Society of America
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