Bethe-hole polarization analyser for the magnetic vector of light

H.W. Kihm, S.M. Koo, Q.H. Kim, K. Bao, J.E. Kihm, W.S. Bak, S.H. Eah, C. Lienau, H. Kim, P. Nordlander, N.J. Halas, N.K. Park and D.-S. Kim ()
Additional contact information
H.W. Kihm: Center for Subwavelength Optics, Seoul National University
S.M. Koo: Photonic Systems Laboratory, School of Electrical Engineering and Computer Science, Seoul National University
Q.H. Kim: Center for Subwavelength Optics, Seoul National University
K. Bao: Rice University
J.E. Kihm: Center for Subwavelength Optics, Seoul National University
W.S. Bak: Center for Subwavelength Optics, Seoul National University
S.H. Eah: Center for Subwavelength Optics, Seoul National University
C. Lienau: Institut für Physik, Carl von Ossietzky Universität
H. Kim: Korea University, Yeongi-gun, Chungnam 339-700, Korea.
P. Nordlander: Rice University
N.J. Halas: Rice University
N.K. Park: Photonic Systems Laboratory, School of Electrical Engineering and Computer Science, Seoul National University
D.-S. Kim: Center for Subwavelength Optics, Seoul National University

Nature Communications, 2011, vol. 2, issue 1, 1-6

Abstract: Abstract The nature of light as an electromagnetic wave with transverse components has been confirmed using optical polarizers, which are sensitive to the orientation of the electric field. Recent advances in nanoscale optical technologies demand their magnetic counterpart, which can sense the orientation of the optical magnetic field. Here we report that subwavelength metallic apertures on infinite plane predominantly sense the magnetic field of light, establishing the orientation of the magnetic component of light as a separate entity from its electric counterpart. A subwavelength aperture combined with a tapered optical fibre probe can also serve as a nanoscale polarization analyser for the optical magnetic field, analogous to a nanoparticle sensing the local electric polarization. As proof of its functionality, we demonstrate the measurement of a magnetic field orientation that is parallel to the electric field, as well as a circularly polarized magnetic field in the presence of a linearly polarized electric field.

Date: 2011
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DOI: 10.1038/ncomms1430

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