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Journal of Optics Volume 16 Number 2,2014.
Sun-Goo Lee1 , Chul-Sik Kee1,2
1 Ultra-Intense Laser Laboratory, Advanced Photonics Research Institute, GIST, Gwangju 500-712, Korea and
2 Center for Subwavelength Optics, Seoul 151-747, Korea.
Abstract
We show that reflections of self-collimated beams at the boundaries of a finite-size coupled zigzag-box resonator, which is designed to slow down the speed of self-collimated beams in a photonic crystal, can be minimized by introducing antireflection structures. The optimal values of design parameters for minimal reflection can be obtained by using one-dimensional antireflection coating theory and finite-difference time-domain simulations. It is shown that the optimized antireflection structures significantly reduce unnecessary finite-size effects, such as strong Fabry–Pérot oscillations in the transmission spectrum and variations in the group velocity curve. Our results could be useful in implementing devices to control self-collimated beams in the time domain.
