1. E. Yablonovitch, Phys. Rev. Lett., 58, No. 20, 2059–2062 (1987).
2. S. John, Phys. Rev. Lett., 58, No. 23, 2486–2489 (1987).
3. J. D. Joannopoulos, R. D. Meade, and J. N. Winn, Photonic Crystals: Molding the Flow of Light, Princeton University Press (1995).
4. J. B. Pendry, Phys. Cond. Matter, 8, 1086–1108 (1996).
5. F. S.-S. Chien, J. B. Tu, and W.-F. Hsien, Phys. Rev. B, 75, 125113/1–125113/8 (2007).