Abstract
We show that a photonic crystal slab can enable efficient polarization conversion. Two mechanisms are identified. The first mechanism relies on the anisotropy of the bulk properties of the metamaterial and is mediated by interferences. The second mechanism is due to the resonant excitation of leaky surface waves at the interface of the photonic crystal. The latter is analogous to the polarization conversion by excitation of surface plasmons on a metallic grating. This is another example of the possibility of mimicking plasmonics with photonic crystals.
Highlights
Metallic gratings have been extensively studied for their ability to rotate the plane of polarization of a normally incident linearly polarized beam by 90◦
Using numerical simulations based on Rigourous Coupled Wave Analysis (RCWA) [12], we study the reflection properties of a 2D photonic crystal slab made of germanium (Ge) for wavelengths around 1.55 μm
We have shown that a photonic crystal slab enables efficient polarization conversion
Summary
Metallic gratings have been extensively studied for their ability to rotate the plane of polarization of a normally incident linearly polarized beam by 90◦. The other mechanism is due to the resonant excitation of leaky surface waves at the interface of the photonic crystal. A photonic crystal slab has several features in common with a metallic grating. It is highly reflective for wavelengths lying in the bandgap and exhibits anisotropy. The beaming of light [7] mediated by surface waves on photonic crystals has been demonstrated. Other phenomena like resonant transmission [8] and coherent thermal emission by excitation of surface waves on a photonic crystal has been demonstrated in [9]. Other nanostructured materials have been studied for their properties of polarization conversion : photonic crystal waveguides [10] and subwavelength gratings illuminated through a glass substrate [11]
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