Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.167401
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Funding
- EPSRC [EP/E031463/1, EP/G000964/1]
- Engineering and Physical Sciences Research Council [EP/E031463/1] Funding Source: researchfish
- EPSRC [EP/E031463/1] Funding Source: UKRI
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Using the principle of causality as expressed in the Kramers-Kronig relations, we derive a generalized criterion for a negative refractive index that admits imperfect transparency at an observation frequency omega. It also allows us to relate the global properties of the loss (i.e., its frequency response) to its local behavior at omega. However, causality-based criteria rely on the group velocity, not the Poynting vector. Since the two are not equivalent, we provide some simple examples to compare the two criteria.
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