Open AccessTerahertz near-field microscopy of complementary planar metamaterials: Babinet's principle
Author(s) -
Andreas Bitzer,
A. Ortner,
Hannes Merbold,
Thomas Feurer,
Markus Walther
Publication year - 2011
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.002537
Subject(s) - terahertz radiation , split ring resonator , metamaterial , optics , magnetic field , electric field , electromagnetic field , physics , resonator , terahertz spectroscopy and technology , near field scanning optical microscope , wavelength , photonic metamaterial , planar , near and far field , optical microscope , scanning electron microscope , computer graphics (images) , quantum mechanics , computer science
Using terahertz near-field imaging we experimentally investigate the resonant electromagnetic field distributions behind a split-ring resonator and its complementary structure with sub-wavelength spatial resolution. For the out-of-plane components we experimentally verify complementarity of electric and magnetic fields as predicted by Babinet's principle. This duality of near-fields can be used to indirectly map resonant magnetic fields close to metallic microstructures by measuring the electric fields close to their complementary analogues which is particularly useful since magnetic near-fields are still extremely difficult to access in the THz regime. We find excellent agreement between the results from theory, simulation and two different experimental near-field techniques.