Fabrication of highly rotational symmetric quasi-periodic structures by multiexposure of a three-beam interference technique

Department of Physics, National Chung Cheng University, Ming Hsiung, Chiayi, Taiwan.
Applied Optics (Impact Factor: 1.78). 09/2007; 46(23):5645-8. DOI: 10.1364/AO.46.005645
Source: PubMed


A simple and efficient interference method for fabricating highly symmetric two-dimensional (2-D) quasi-periodic structures (QPSs) is theoretically and experimentally demonstrated. With a three-beam interference technique, one can fabricate a periodic 2-D structure having sixfold symmetry. When this structure is multiduplicated into other specific orientations its combination results in a QPS with multifold symmetry. By use of n exposures with a rotation angle of 60 degrees /n, one can create a 2-D QPS with six n-fold symmetry. The QPS with a super high symmetry level, as high as 60-fold, is demonstrated for the first time to the best of our knowledge. The diffraction pattern of a QPS is consistent with the Fourier transform calculation. The fabricated structures should be useful for many applications, such as isotropic bandgap materials and extraction enhancement of light-emitting diodes.

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    • "The fabrication also employs the multiple-exposure idea but it is applied to three-beam interference technique (Lai et al., 2006b). The fabrication of quasi-periodic structures with a rotation symmetry as high as 60-fold is demonstrated and confirms the theoretical calculation (Lai et al., 2007). Moreover, we calculate the optical property of fabricated quasi-periodic structures and demonstrate that PQC possesses an isotropic PBG that could not be achieved with traditional PCs. "

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