Abstract
Slow light plays an outstanding role in a wide variety of optical applications, from quantum information to optical processing. While slow optical guiding in photonic crystal waveguides is typically based on Bragg band gaps occurring in non-resonant photonic crystals, here we explore the possibility to leverage the hybridization photonic band gaps of resonant photonic crystals to induce a different form of slow light guiding. We study a line-defect waveguide in a periodic structure composed of high-permittivity resonant dielectric objects and exploit the different guiding mechanisms associated with the hybridization band gap to induce slow light in the resonant phase of the crystal. We demonstrate quantitatively that this method can, in principle, produce high group indices over large bandwidths with potential values of group-index bandwidth products up to 0.67.
Highlights
The ability to control the power flow carried by optical pulses, and especially the possibility of obtaining low group velocities is fundamental in the realization of efficient integrated photonic devices [1]
A common challenge when it comes to engineering slow light in photonic crystal waveguides (PCWs) is to reduce the group velocity dispersion (GVD), which results in pulse spreading and restricts the bandwidth of slow modes [6,12,13]
We proposed a novel approach leveraging the inherent dispersion of locally-resonant photonic crystals, known as locally-resonant crystalline metamaterials, as a new degree of freedom to induce a new generation of slow-light waveguides with unusual dispersive properties
Summary
The ability to control the power flow carried by optical pulses, and especially the possibility of obtaining low group velocities is fundamental in the realization of efficient integrated photonic devices [1]. Non-resonant photonic crystals (PCs) [9] based on Bragg interferences are currently the prevalent solution for slow wave propagation, which is obtained using evanescently coupled cavities or line-defect waveguides [6,10]. Such all-dielectric resonant photonic crystals offer a variety of optical effects and applications due to the existence of Mie resonances [21,23] They can be built out of high-index dielectric materials, such as Silicon at visible or near infrared (IR) frequencies, provide a promising low-loss alternative to plasmonic materials, with values of refractive indices up to 5.5. We find that dielectric materials with a refractive index of 6, which are for instance readily available in the IR, can be exploited to engineer slow light in a resonant waveguide, with values of GBP potentially higher than state-of-the-art non-resonant photonic crystal waveguides
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