Klein AE, Janunts N, Schmidt S, Bin Hasan S, Etrich C, Fasold S, Kaiser T, Rockstuhl C, Pertsch T (2017)
Publication Type: Journal article
Publication year: 2017
Book Volume: 9
Pages Range: 6695-6702
Journal Issue: 20
DOI: 10.1039/c6nr06561a
The ability of squeezing and guiding light in nanoscale plasmonic waveguides makes them especially interesting for photonic circuits. In spite of reported realizations of plasmonic waveguides, experimental studies on the content of plasmonic modes and mode-selective excitation methods are rare. We apply here a Dual-SNOM technique, incorporating two aperture scanning near-field optical microscopes, for simultaneous near-field excitation and detection of plasmonic modes in gold strip waveguides. Depending on the waveguide width, either a single waveguide mode or a beating pattern of several modes is observed. The relative excitation strengths of the individual modes in multi-mode waveguides are shown to be controllable by the lateral position of the excitation tip. The excitation coefficients are described by an analytical model and the results are fully corroborated by analytical calculations and full-wave numerical simulations. The Dual-SNOM technique provides a "non-invasive" method of local excitation and detection of photonic modes thus making it a valuable tool for in situ characterization of complex photonic micro- and nanostructures.
APA:
Klein, A.E., Janunts, N., Schmidt, S., Bin Hasan, S., Etrich, C., Fasold, S.,... Pertsch, T. (2017). Dual-SNOM investigations of multimode interference in plasmonic strip waveguides. Nanoscale, 9(20), 6695-6702. https://doi.org/10.1039/c6nr06561a
MLA:
Klein, Angela E., et al. "Dual-SNOM investigations of multimode interference in plasmonic strip waveguides." Nanoscale 9.20 (2017): 6695-6702.
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