Slow light miniature devices with ultra-flattened dispersion in silicon-on-insulator photonic crystal

Abstract

We propose a silicon-on-insulator (SOI) photonic crystal waveguide within a hexagonal lattice of elliptical air holes for slow light propagation with group velocity in the range 0.0028c to 0.044c and ultra-flattened group velocity dispersion (GVD). The proposed structure is also investigated for its application as an optical buffer with a large value of normalized delay bandwidth product (DBP), equal to 0.778. Furthermore it is shown that the proposed structure can also be used for time or wavelength-division demultiplexing to separate two telecom wavelengths, 1.31 microm and 1.55 microm, on a useful time-scale and with minimal distortion.

Silicon-on-insulator photonic crystal miniature devices with slow light enhanced third-order nonlinearities

“…In this paper, we show that, at comparable power density levels and slowing factor values, silicon based PhC slow-light waveguides can be realized as effectively in relatively thick silicon waveguide cores supported by a silica cladding, 1 with no cover material, as in unsupported (and therefore inherently fragile) thin silicon membranes. Furthermore, we show that the dispersion control, which is required for soliton formation and broadband delay enhancement, can be obtained simply by moving from a PhC structure based on circular holes (with several different hole diameters being required in a single structure) to a specific choice of elliptical hole parameters in uniform arrays of elliptical holes.…”

“…High-refractive-index-contrast structures such as photonic crystal (PhC) waveguides have been demonstrated to be a promising approach to the achievement of slow light behavior. 1 Linear effects such as gain, the thermo-optic effect, and some types of electro-optic interaction, scale linearly with the slow-down factor, whereas nonlinear effects such as two-photon absorption (TPA) and Kerr nonlinearity, scale with the square of the slow-down factor. 2,3 The spatial compression experienced by light when it goes from a fast light situation to a slow light situation, and the greater time that light spends in the waveguide, because of the slow group velocity, increase the strength of the light-matter interaction, and together imply the enhancement of nonlinear effects.…”

Slow light tunability in photonic crystals by defect layers

“…The incident pulse with a Full Width at HalfMaximum (FWHM) of 0.08 ps expands to 0.13 ps at the output. Due to this vanishing dispersion, the width of pulse at input end is nearly equal to that at output end and Gaussian pulse can be regarded as a plan wave [11]. To investigate group velocity variations versus defect refractive indices, two parts of transmittance spectrum; flat curves and sharp curves have been considered.…”

Enriching the Symmetry of Maxwell Equations through Unprecedented Magnetic Responses of Artificial Metamaterials and Their Revolutionary Applications

“…Recently, the topic of slow light has garnered considerable attention because slow light is potentially applicable to optical switching and to storage devices like optical hard disks [14,[106][107][108][109][110]. But in SPP mode, left-handed slab waveguides are very sensitive to surface roughness and operate in multiple modes [108].…”