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Proceedings Paper

Experimental demonstration of negative index of refraction in magnetic semiconductors
Author(s): Adil-Gerai Kussow; Alkim Akyurtlu; Yassine Ait-El-Aoud; Hamzeh M. Jaradat
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Paper Abstract

Homogeneous negative refractive index materials are introduced as an alternative to normally utilized inhomogeneous metamaterials. The theory of such materials was developed several years ago (A. Kussow and A. Akyurtlu, PRB 78, 205202 (2008)), and the effect is due to the coexistence of the spin-wave mode with the plasmonic mode, and both modes are activated by the electromagnetic field with simultaneous negative permittivity and permeability responses within the narrow frequency band close to the ferromagnetic resonance. To justify this theory, the thin films of ferromagnetic semiconductor, Cr-doped indium oxide, were fabricated, with clearly measured ferromagnetism at high saturation magnetization and a Curie temperature which is much higher than room temperature. The refractive index, within mid-IR, was extracted from combined transmittance and reflectance data and was compared with theoretical prediction. Also, a direct standard beam displacement method validates the effect of negative refraction in this material.

Paper Details

Date Published: 30 September 2014
PDF: 12 pages
Proc. SPIE 9160, Metamaterials: Fundamentals and Applications 2014, 91601N (30 September 2014); doi: 10.1117/12.2060930
Show Author Affiliations
Adil-Gerai Kussow, Univ. of Massachusetts Lowell (United States)
Alkim Akyurtlu, Univ. of Massachusetts Lowell (United States)
Yassine Ait-El-Aoud, Univ. of Massachusetts Lowell (United States)
Hamzeh M. Jaradat, Univ. of Massachusetts Lowell (United States)

Published in SPIE Proceedings Vol. 9160:
Metamaterials: Fundamentals and Applications 2014
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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