Microwave gain medium with negative refractive index
نویسندگان
چکیده
منابع مشابه
Sign of the refractive index in a gain medium with negative permittivity and permeability
We show how the sign of the refractive index in any medium may be derived using a rigorous analysis based on Einstein causality. In particular, we consider left-handed materials, i.e., media that have negative permittivities and permeabilities at the frequency of interest. We find that the consideration of gain in such media can give rise to a positive refractive index. © 2006 Optical Society o...
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ژورنال
عنوان ژورنال: Nature Communications
سال: 2014
ISSN: 2041-1723
DOI: 10.1038/ncomms6841