Abstract
Optical nanoantennas, i.e., arrangements of plasmonic nanostructures, promise to enhance the light–matter interaction on the nanoscale. In particular, nonlinear optical spectroscopy of single nanoobjects would profit from such an antenna, as nonlinear optical effects are already weak for bulk material, and become almost undetectable for single nanoobjects. We investigate the design of optical nanoantennas for transient absorption spectroscopy in two different cases: the mechanical breathing mode of a metal nanodisk and the quantum-confined carrier dynamics in a single CdSe nanowire. In the latter case, an antenna with a resonance at the desired wavelength optimally increases the light intensity at the nanoobject. In the first case, the perturbation of the antenna by the investigated nanosystem cannot be neglected and off-resonant antennas become most efficient.
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We gratefully acknowledge financial support from the DFG (SPP 1391, ultrafast nanooptics).
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This article is part of the topical collection “Ultrafast Nanooptics” guest edited by Martin Aeschlimann and Walter Pfeiffer.
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Schumacher, T., Brandstetter, M., Wolf, D. et al. The optimal antenna for nonlinear spectroscopy of weakly and strongly scattering nanoobjects. Appl. Phys. B 122, 91 (2016). https://doi.org/10.1007/s00340-016-6364-5
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DOI: https://doi.org/10.1007/s00340-016-6364-5