| In1987, E.Yablonovitch and S.John proposed the concept of photonic crystal (PhC) independently. The PhC is an artificial micro-structure, which is provided by the different dielectric materials arranged in a periodic manner. Due to the promising applications, PhCs existed in nature can not meet the needs of the special nature of the material. It is very meaningful to get large-area of PhCs with different period and size. Holographic method is a simple, fast fabrication method of PhCs. And multi-fiber interferometry further simplifies the device composition without use of beam splitter and the beam expander. The main contents of the paper are as follows:1To give A brief introduction of the basic concept and production methods of PhCs, a detailed description of the periodical PhCs, quasi-periodical PhCs and graded PhCs and list a wide range applications of the three PhCs at the current stage.2In the paraxial approximation, holographic PhC structures have been calculated for different groups of fiber interference. The intensity difference has also been investigated.3In the same time, theoretical simulations of quasi-crystalline PhCs (QPCs) with different rotational symmetry have been given by multi-fiber interference.4Gradient photonic crystal (GPhC) structures are designed for four fiber interferometry. The beam splitting and focusing effect is analyzed for GPC structures. This provides theoretical and experimental basis for the production of good beam splitter and a focusing lens.5Experimentally, we have built a multi-fiber holographic interfering setup and observed the interferogram of PhCs and QPhCs. And for the experimental convenience, we set (4+1) and (5+1) fiber interfering setups and the effect of the central beam on the interfering field is explored. The results show that the addition of the central beam can provide PhCs with composite structures. By comparing the theoretical and experimental results, a good agreement is obtained. |
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