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Proceedings Paper

Nonlocal modification and quantum optical generalization of effective-medium theory for metamaterials
Author(s): Martijn Wubs; Wei Yan; Ehsan Amooghorban; N. Asger Mortensen
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Paper Abstract

A well-known challenge for fabricating metamaterials is to make unit cells significantly smaller than the operating wavelength of light, so one can be sure that effective-medium theories apply. But do they apply? Here we show that nonlocal response in the metal constituents of the metamaterial leads to modified effective parameters for strongly subwavelength unit cells. For infinite hyperbolic metamaterials, nonlocal response gives a very large finite upper bound to the optical density of states that otherwise would diverge. Moreover, for finite hyperbolic metamaterials we show that nonlocal response affects their operation as superlenses, and interestingly that sometimes nonlocal theory predicts the better imaging. Finally, we discuss how to describe metamaterials effectively in quantum optics. Media with loss or gain have associated quantum noise, and the question is whether the effective index is enough to describe this quantum noise effectively. We show that this is true for passive metamaterials, but not for metamaterials where loss is compensated by linear gain. For such loss-compensated metamaterials we present a quantum optical effective medium theory with an effective noise photon distribution as an additional parameter. Interestingly, we find that at the operating frequency, metamaterials with the same effective index but with different amounts of loss compensation can be told apart in quantum optics.

Paper Details

Date Published: 11 September 2013
PDF: 10 pages
Proc. SPIE 8806, Metamaterials: Fundamentals and Applications VI, 88061F (11 September 2013); doi: 10.1117/12.2024465
Show Author Affiliations
Martijn Wubs, Technical Univ. of Denmark (Denmark)
Wei Yan, Technical Univ. of Denmark (Denmark)
Ehsan Amooghorban, Shahrekord Univ. (Iran, Islamic Republic of)
N. Asger Mortensen, Technical Univ. of Denmark (Denmark)

Published in SPIE Proceedings Vol. 8806:
Metamaterials: Fundamentals and Applications VI
Allan D. Boardman; Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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