Ms. Lieve Lambrechts Profile

Lieve Lambrechts

at Vrije Univ Brussel

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Proceedings Article | 18 April 2016 Paper

Transformation optics approach for Goos-Hänchen shift enhancement at metamaterial interfaces

Lieve Lambrechts, Vincent Ginis, Jan Danckaert, Philippe Tassin

Proceedings Volume 9883, 98831B (2016) https://doi.org/10.1117/12.2227519

KEYWORDS: Metamaterials, Geometrical optics, Interfaces, Electromagnetism, Maxwell equations, Metamaterials, Geometrical optics, Maxwell's equations, Electroluminescent displays, Refractive index

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Since its first observation in 1947, the Goos-Hänchen effect—an electromagnetic wave phenomenon where a totally reflected beam with finite cross section undergoes a lateral displacement from its position predicted by geometric optics—has been extensively investigated for various types of optical media such as dielectrics, metals and photonic crystals. Given their huge potential for guiding and sensing applications, the search for giant and tunable Goos-Hänchen shifts is still an open question in the field of optics and photonics. Metamaterials allow for unprecedented control over electromagnetic properties and thus provide an interesting platform in this quest for Goos-Hänchen shift enhancement. Over the last few years, the Goos-Hänchen effect has been investigated for specific metamaterial interfaces including graphene-on-dielectric surfaces, negative index materials and epsilon- near-zero materials. In this contribution, we generalize the approach for the investigation of the Goos-Hänchen effect based on the geometric formalism of transformation optics. Although this metamaterial design methodology is generally applied to manipulate the propagation of light through continuous media, we show how it can also be used to describe the reflections arising at the interface between a vacuum region and a transformed region with a metamaterial implementation. Furthermore, we establish an analytical model that relates the magnitude of the Goos-Hänchen shift to the underlying geometry of the transformed medium. This model shows how the dependence of the Goos-Hänchen shift on geometric parameters can be used to dramatically enhance the size of the shift by an appropriate choice of permittivity and permeability tensors. Numerical simulations of a beam with spatial Gaussian profile incident upon metamaterial interfaces verify the model and firmly establish a novel route towards Goos-Hänchen shift engineering using transformation optics.

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