Abstract

The controllable dispersion properties of photonic crystals (PhCs) lead to various exotic phenomena, such as negative refraction, flat lensing, non diffractive propagation of light, super-prism effect, chromatic and spatial filtering of light, etc. We investigate beam spatial shaping, enabled by the gap-less spatial filtering phenomenon [1]. Previously, such PhC filters of 2D and 3D rectangular geometry were demonstrated [2], allowing the deflection of unwanted spectral components to diffraction maxima as schematically shown in Fig. 1(a–d), however the highest quality beams are often required to have an uniform angular spectrum in all radial directions.

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