Negative Uniaxial Crystal Behavior Of Circular Photonic Crystal

In this paper, we introduce an unconventional photonic crystal (PhC) geometry which defines two resonance frequencies. The presented circular PhC structure behaves as a negative uniaxial crystal and admits two preferred propagation directions defined by an extraordinary and an ordinary refractive in...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 2008-12, Vol.44 (12), p.1225-1231
Main Authors: Massaro, A., Errico, V., Cingolani, R., De Vittorio, M., Passaseo, A.
Format: Article
Language:English
Subjects:
Electromagnetic fields
Electromagnetic propagation
Electromagnetic wave polarization
Geometry
Gratings
Negative uniaxial crystal
Periodic structures
photonic crystal (PhC)
Photonic crystals
Refractive index
Resonance
Resonant frequency
Studies
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Summary:In this paper, we introduce an unconventional photonic crystal (PhC) geometry which defines two resonance frequencies. The presented circular PhC structure behaves as a negative uniaxial crystal and admits two preferred propagation directions defined by an extraordinary and an ordinary refractive index representing two field polarizations. The circular grating profile splits the electromagnetic field into a radial (extraordinary field) and a tangential (ordinary field) component, which represent two modes of the periodic structure. The total field in the PhC slab is generated by the superposition effect of the ordinary and extraordinary field produced in the 2-D periodic plane. This field configuration is obtained by the analogy with the dielectric multilayer structure. The presented PhC circular lattice pattern consists of air holes in a GaAs material (n = 3.408) along circular concentric lines which have the same distance defined as the PhC a period. We validate the birefringence theory by the comparison between analytical and numerical results and then between the numerical and experimental ones.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.2008.2001951