Fine tuning of the center frequency of the slow light regime in an infiltrated W09 photonic crystal waveguide

Abstract

We report the tuning process of center frequency in a dispersion engineered slow light regime in W09 photonic crystal slab waveguide (W09-PhCSW). The W09-PhCSW consists of hexagonal lattice of air holes of radii r = 0.3ɑ in a Si substrate with a reduced waveguide width. This end is achieved by means of simultaneous infiltration of magneto and opto-fluidics in first and second rows adjacent to the waveguide. In particular, change in infiltration of opto-fluidics (1.5 ≤ nf ≤ 2.1) is used for selecting the optimized group index with low group velocity dispersion. Concurrently, the center frequency in the constant group index regime (Δng = ±5%) get tuned with an external magnetic field. This course of external controllability originated from the field dependent refractive index of magneto-fluidic. After all, this design leads to a considerable low group velocity dispersion of |β2| ≤ 2000 (ɑ/2πc2), the group index values in the range of 23 ≤ ng ≤ 103 and reasonable group index-bandwidth product values (0.114 ≤ ng × Δω/ωc ≤ 0.26).