Berlin 2008 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 6: Photonic crystals I
HL 6.8: Talk
Monday, February 25, 2008, 11:15–11:30, EW 201
Optical properties of bowtie slot antennas — •Hongcang Guo1, Thomas Zentgraf1, Todd Meyrath1, Na Liu1, Liwei Fu1, Heinz Schweizer1, Stefan Kaiser2, and Harald Giessen1 — 14th Physics Institute, University of Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany — 21st Physics Institute, University of Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Optical nanoantennas recently have gained considerable attention[1,2] due to their potential of localizing optical fields on a subwavelength scale. We study the geometrical dependence of the resonant properties of bowtie slot antennas in the optical regime by experiments and numerical simulations. Two types of transmission resonances in the visible and near infrared range are observed for the subwavelength scale antennas. For slot antennas of several ten nanometers thickness, only localized plasmonic resonances are observed and the resonant wavelength shows a linear dependence on the bowtie aperture perimeter. As for several hundred nanometer thick slot antennas, in addition to localized plasmonic resonances, Fabry-Perot-like resonances are excited at the shorter wavelength range, and the resonant wavelength shows a strong dependence on antenna thickness.
[1] P. Mühlschlegel et al., Science 308, 1607 (2005) [2] L. Novotny, Phys. Rev. Lett. 98, 266802 (2007)