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Fabrication and Optical Characterization of Colloidal 3 - D Photonic Crystals
N. Y. Ha,Y. Woo,Byungchoo Park,J. W. Wu 한국진공학회(ASCT) 2003 Applied Science and Convergence Technology Vol.12 No.S1
3-D photonic band-gap structures are fabricated from dielectric colloidal polystyrene beads through a centrifuge method. The fabricated photonic crystals exhibit opalescent colors under white light and show a clear diffraction peak dependent on the incident angle of the light beam. Also the scanning electron microscope image was taken to verify the face-centered cubic crystal structure. Bragg's law and Snell's law are employed to describe the position of angle resolved diffraction peaks. It was shown that the optically deduced effective refractive index and lattice constants were in good agreement with the crystal structure identified by scanning electron microscope.