Squeezing and expanding light without reflections via transformation optics

We study the reflection properties of squeezing devices based on transformation optics. An analytical expression for the angle-dependent reflection coefficient of a generic three-dimensional squeezer is derived. In contrast with previous studies, we find that there exist several conditions that guar...

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Bibliographic Details
Published in:Optics express 2011-02, Vol.19 (4), p.3562-3575
Main Authors: García-Meca, C, Tung, M M, Galán, J V, Ortuño, R, Rodríguez-Fortuño, F J, Martí, J, Martínez, A
Format: Article
Language:English
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Summary:We study the reflection properties of squeezing devices based on transformation optics. An analytical expression for the angle-dependent reflection coefficient of a generic three-dimensional squeezer is derived. In contrast with previous studies, we find that there exist several conditions that guarantee no reflections so it is possible to build transformation-optics-based reflectionless squeezers. Moreover, it is shown that the design of antireflective coatings for the non-reflectionless case can be reduced to matching the impedance between two dielectrics. We illustrate the potential of these devices by proposing two applications in which a reflectionless squeezer is the key element: an ultra-short perfect coupler for high-index nanophotonic waveguides and a completely flat reflectionless hyperlens. We also apply our theory to the coupling of two metallic waveguides with different cross-section. Finally, we show how the studied devices can be implemented with non-magnetic isotropic materials by using a quasi-conformal mapping technique.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.19.003562