Advances in Engineering Advances in Engineering features breaking research judged by Advances in Engineering advisory team to be of key importance in the Engineering field. Papers are selected from over 10,000 published each week from most peer reviewed journals.
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.