11 January 2008 Extraction of guided waves by diffraction of 2D photonic crystals fabricated on the surface of waveguides
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Using 2-dimensional (2D) photonic crystal with hexagonal lattice to extract guided waves inside slab waveguides is investigated in the paper. Since 2D hexagonal lattice structure is circularly symmetrical, the effect of light extraction can be regarded as the same for guided waves propagating toward different directions on the plane of the slab. Theoretical analysis was carried out under the assumption that a hexagonal lattice consists of many groups of gratings with different periods and orientations. Based on the assumption, the simulations of the extracted light-spot distributions on the waveguides for the guided waves with different reflection angles inside the slab were obtained. The simulations are consistent with the experimental result, verifying that the observed spot array above the slab surface, where 2D hexagonal lattice was fabricated, was generated by the diffraction of the lattice. The light extraction method can be used to separate a laser beam into many distributed beams for optical network interconnection applications and to extract trapped light inside LEDs. Theoretical analysis indicates that to obtain efficient light extraction via hexagonal lattice, lattice constant should be properly chosen. Method for choosing desired lattice constant is provided.
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Xiaoyun Chen, Xiaoyun Chen, Xiangsu Zhang, Xiangsu Zhang, Shou Liu, Shou Liu, Xuechang Ren, Xuechang Ren, } "Extraction of guided waves by diffraction of 2D photonic crystals fabricated on the surface of waveguides", Proc. SPIE 6837, Information Optics and Photonics Technologies II, 683710 (11 January 2008); doi: 10.1117/12.755935; https://doi.org/10.1117/12.755935

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