The Effect of Symmetry Breaking in Coupled Cavity Photonic Crystal Waveguide on Dispersion Characteristics

Abstract

In this study, we explore the effect of integrated auxiliary rods at varying angles to the primary cavity rod on the dispersion characteristics of the photonic crystal coupled cavity waveguide (PC CCW). Here, it is intended to break the symmetry of the cavity region by introducing auxiliary rods which gives the degree of freedom for tuning effective index of the PC waveguide. Furthermore, rotational angle variations of auxiliary rods reveal slow light operation of the PC CCW where the group index is maximized and group velocity dispersion, as well as the third-order dispersion, are minimized. In addition, auxiliary rods with a broken symmetry increase not only group index but also operating bandwidth and accordingly increase group bandwidth product by 675\%. Leveraging these results, we demonstrate effective rainbow trapping by manipulating the auxiliary rod angles in photonic crystal coupled cavity waveguides. Our results have encouraging implications for optical buffering, multiplexing, demultiplexing, advanced time-domain and spatial signal processing.

arXiv commentTo appear in Optical and Quantum Electronics

References in corpus (4)

• Design of photonic crystal microcavities for cavity QED
• Realization of "Trapped Rainbow" in 1D slab waveguide with Surface Dispersion Engineering
• Enhanced self-collimation effect by low rotational symmetry in hexagonal lattice photonic crystals
• Reduced Symmetric 2D Photonic Crystal Cavity with Wavelength Tunability

Cited by in corpus (1)

• Reformulation of continuum defects in terms of the general teleparallel geometry in the language of exterior algebra