Physics – Optics
Scientific paper
2010-09-23
Optics Express Vol. 19, Iss. 22, pp. 21404-21418 (2011)
Physics
Optics
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-22-21404
Scientific paper
Total internal reflection occurs for large angles of incidence, when light is incident from a high-refractive-index medium onto a low-index medium. We consider the situation where the low-index medium is active. By invoking causality in its most fundamental form, we argue that evanescent gain may or may not appear, depending on the analytic and global properties of the permittivity function. For conventional, weak gain media, we show that there is an absolute instability associated with infinite transversal dimensions. This instability can be ignored or eliminated in certain cases, for which evanescent gain prevails.
Grepstad Jon Olav
Skaar Johannes
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