Animals Grade 6 (Holt Science & Technology Modules 2005) by Holt Rinehart & Winston

By Holt Rinehart & Winston

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The measured transmission is 55%. Actually, the result is also 55% for the case of a different dielectric waveguide with w = 2a. This result agrees with what we expect from a k-matching argument. 20 (21t1a). 54, very close to the value obtained from the numerical simulations. 4 is the dielectric constant of the traditional waveguide. We expect the efficiency of the tapered coupler described in Fig. 14 to remain fairly high even for coupling out o/the photonic crystal waveguide because of the time-reversibility of Maxwell's equations.

Meade, and J. N. Winn, Photonic Crystals (Princeton, New York, 1995). E. Yablonovitch, Phys. Rev. Lett. 58, 2509 (1987). S. John, Phys. Rev. Lett. 58, 2486 (1987). A. Mekis, J. C. Chen, I. Kurland, S. Fan, P. R. Villeneuve, and J. D. Joannopoulos, Phys. Rev. Lett. 77, 3787 (1996). S. Y. Lin, E. Chow, V. Hietch, P. R. Villeneuve, and J. D. Joannopoulos, Science 282,274 (1998). J. L. Jaffe, Phys. Rev. B 45, 100 (1992). A. Mekis, S. Fan, and J. D. Joannopoulos, Phys. Rev. B 58, 4809 (1998). P. R. Villeneuve, S.

However, most of these applications are based on the presence of defect or cavity modes, which are obtained by locally disturbing the periodicity of the photonic crystal. The frequency of these modes lie within the forbidden band gap of the pure crystal, and the associated fields are localized around the defect. We have demonstrated [36,37] the existence of such cavity structures built around the layer-by-Iayer PBG crystal. The defects are formed by either adding or removing dielectric material to or from the crystal.

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