Infrared resonances of local fields and ellipsometric spectra of negative-refraction metamaterials
| Authors | |
|---|---|
| Year of publication | 2011 |
| Type | Article in Periodical |
| Magazine / Source | Thin Solid Films |
| MU Faculty or unit | |
| Citation | |
| Doi | http://dx.doi.org/10.1016/j.tsf.2010.12.055 |
| Field | Solid matter physics and magnetism |
| Keywords | Ellipsometry; Infrared; Metamaterials |
| Description | Suitable combinations of the optical response and geometrical form of flat or curved interfaces of the constituents in nanometer-sized metamaterials can lead to a strong enhancement of local fields, seen typically as sharp spectral resonances in optical spectra. We propose a classification of the resonant phenomena in inhomogeneous systems within the effective-medium approximation, and examine their manifestation in infrared ellipsometry. We report mid-infrared ellipsometric spectra of a doped semiconductor metamaterial, exhibiting negative refraction. We provide a simple explanation for the difference in the directions of the phase- and energy propagation. The resonance responsible for a strong anisotropy and the interesting behavior of refracted light is found to lead to characteristic features in the ellipsometric spectra. |
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