Optical induced area-controllable two-dimensional eight-fold symmetric photonic quasicrystal microstructures

We have experimentally demonstrated a convenient method to fabricate area-controllable photonic quasicrystals in a photorefractive crystal. Two-dimensional eight-fold symmetric quasicrystal microstructures have been fabricated by using a diffractive optical element and Fourier transform lens system. The experimental devices of this method do not need complex optical alignment elements, and the area of induced quasicrystal microstructures can be adjusted flexibly. Induced eight-fold symmetric quasicrystal microstructures are observed and validated by guided wave intensity pattern and far-field diffraction pattern imaging. Induced quasicrystal microstructures can be permanently fixed in the crystal or erased by white light flushing according to different requirements.