Abstract-Tuning Plasmonic Cloaks with an External Magnetic Field

 

W. J. M. Kort-Kamp, F. S. S. Rosa, F. A. Pinheiro, and C. Farina
Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro 21941-972, Rio de Janeiro, Brazil
http://prl.aps.org/abstract/PRL/v111/i21/e215504

We propose a mechanism to actively tune the operation of plasmonic cloaks with an external magnetic field by investigating electromagnetic scattering by a dielectric cylinder coated with a magneto-optical shell. In the long wavelength limit, we show that the presence of a magnetic field may drastically reduce the scattering cross section at all observation angles. We demonstrate that the application of magnetic fields can modify the operation wavelength without the need of changing material and/or geometrical parameters. We also show that applied magnetic fields can reversibly switch on and off the cloak operation. These results, which could be achieved for existing magneto-optical materials, are shown to be robust to material losses, so that they may pave the way for developing actively tunable, versatile plasmonic cloaks.

© 2013 American Physical Society

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.111.215504

DOI:

10.1103/PhysRevLett.111.215504

PACS:

81.05.Xj, 78.67.Pt, 85.70.Sq