Journal
OPTICS EXPRESS
Volume 19, Issue 4, Pages 3686-3693Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.003686
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Funding
- Karlsruhe School of Optics and Photonics (KSOP)
- Center for Functional Nanostructures (CFN)
- Deutsche Forschungsgemeinschaft (DFG) [DFG EI 442/3-1, DFG EI 442/2-2]
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We perform two-photon excitation confocal experiments on coupled gold nanoantennas and observe time-integrated luminescence spectra that match plasmonic mode emission in the far-field. We show that the transversal particle plasmon mode can be excited, using excitation light that is cross-polarized with respect to the gold luminescence signal and therefore oriented along the long axis of the dipole gold antenna. We provide evidence for losses in polarization information from the excitation channel to the luminescence response due to the nature of the energy and momentum transfer. Finally, we map out the two-photon induced luminescence intensity profile for a fixed excitation wavelength. and varying antenna arm length L. (C) 2011 Optical Society of America
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