Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 18: Plasmonics and Nanooptics I: Microscopy
HL 18.9: Vortrag
Montag, 7. März 2016, 17:15–17:30, S054
Coherent spectroscopy of single metallic nanostructures — •Martin Silies1, Heiko Kollmann1, Martin Esmann1, Julia Witt2, Gunther Wittstock2, and Christoph Lienau1 — 1AG Ultraschnelle Nano-Optik, Institut für Physik, Carl von Ossietzky Universität Oldenburg, Germany — 2AG Wittstock, Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Germany
Metallic nanostructures exhibit strong optical resonances and enhanced optical near-fields, enabling the transfer of far-field radiation onto subwavelength scales. Even so, the mismatch of the optical absorption or scattering cross-section of a single nanostructure and the free space wavelength makes far-field spectroscopic investigations challenging. Further, single nanostructures with geometric dimensions of less than 50nm require highly sensitive and almost background-free spectroscopic methods. For this, modulation-based methods such as focus or Spatial Modulation Spectroscopy (SMS)[1] have been proven to be able to quantitatively measure the scattering and absorption cross section simultaneously [2]. Here, we present a combined approach of a commonly used confocal SMS setup and broadband VIS-IR Fourier Transform spectroscopy to measure the extinction cross section of single nanostructures in the time domain. We show polarization-resolved spectra of single chemically synthesized gold nanorods resonant in the near infrared. An extension of the approach to the study of hybrid nanostructures and to time-resolved phenomena is discussed.
[1] A. Arbouet et al., PRL 93, 127401 (2004)
[2] M. Husnik et al., PRL 109, 233902 (2012)