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  • 2013 Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
  • (Optica Publishing Group, 2013),
  • paper CK_P_13

Focussing by a Flat Woodpile 3D Photonic Crystal

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Abstract

Photonic crystals (PhCs) are materials with spatially modulated refraction index on a wavelength scale. They are well-known due to their temporal dispersion and photonic band-gaps, but also for the spatial dispersion properties, allowing the management of spatial propagation properties of light. For particular geometries PhCs may provide non-diffractive propagation of light or even negative spatial dispersion for a beam propagating inside the structure. This negative dispersion compensates the diffractive broadening of the beam propagating in space behind the PhC [1]. In Fig 1.a we see an example of three spatial dispersion curves, which are marked by black, continues lines. For particular parameters the upper dispersion curve displays a convex segment (marked by the red arrow) that could be called “focusing” curvature. The radiation corresponding to this “upper” branch will be focused behind the crystal. The focusing distance depends on the curvature of the branch.

© 2013 IEEE

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