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A quantitative analysis of self-collimation effects in planar photonic crystals

The lasing cavities and ultra-fast switch based on the self-collimation (SC) of photonic crystal have been studied in this work. Some special properties of these devices are demonstrated, such as the higher quality factors and concise integration of the lasing cavities, the tolerance of the non-parallel reflectors in Fabry–Perot cavities. With nonlinearity, the ultra-fast switch can also be realized around the SC frequency. All these functional devices are designed based on the strong beam confinement of SC.

In this paper, we numerically investigate the highly directional beaming effect when a transverse magnetic plane wave passes through a metallic slit-bumps nanostructure by using the finite difference time domain method. We find that the narrow bump with width w∼0.1λspp can serve as a good light emitter and two arrays of narrow bumps with suitable separation can diffract the surface plasmons into highly directional collimated beams. The number and the direction of the beams can be controlled by adjusting the geometry parameters of the nanostructure. The structure with optimized parameters has practical applications as directional surface plasmon polaritons couplers in integrated photonic devices.