Slow-light transmission with high group index and large normalized delay bandwidth product through successive defect rods on intrinsic photonic crystal waveguide

Elshahat, Sayed; Khan, K.; Yadav, Ashish; Bibbò, Luigi; Ouyang, Zheng

doi:10.1016/j.optcom.2018.02.063

Cited by 27 publications

(8 citation statements)

References 32 publications

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“…The lattice constant a is changed to acquire a center wavelength of 1550 nm. It should be noted that, with the scaling characteristic of PhCs, the relationship between the operational wavelength

and the lattice constant

can be expressed as [ 26 ]

, where

is the central normalized measured frequency for each given

. Therefore, the properties of PhC can remain unchanged, provided one expands or decreases the parameters of the PCW structure proportionally.…”

Section: Structure Geometry and Simulation Resultsmentioning

confidence: 99%

High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid

2020

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Slow light with adequate low group velocity and wide bandwidth with a flat band of the zero-dispersion area were investigated. High buffering capabilities were obtained in a silicon-polymer coupled-slot slab photonic crystal waveguide (SP-CS-SPCW) with infiltrating slots by ionic liquid. A figure of merit (FoM) around 0.663 with the lowest physical bit length Lbit of 4.6748 µm for each stored bit in the optical communication waveband was gained by appropriately modifying the square air slot length. Posteriorly, by filling the slots with ionic liquid, the Lbit was enhanced to be 4.2817 μm with the highest FoM of 0.72402 in wider transmission bandwidth and ultra-high bit rate in terabit range, which may become useful for the future 6G mobile communication network. Ionic liquids have had a noticeable effect in altering the optical properties of photonic crystals. A polymer was used for the future incorporation of an electro-optic effect in buffers to realize the dynamic controlling of optical properties. Ionic liquids enhanced the transmission rate through optical materials. Additionally, the delay time in the ns-range was achieved, providing longer delay and ultra-low group velocity, which is important for light-matter interaction in light amplifiers and nonlinear devices.

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and the lattice constant

can be expressed as [ 26 ]

, where

is the central normalized measured frequency for each given

. Therefore, the properties of PhC can remain unchanged, provided one expands or decreases the parameters of the PCW structure proportionally.…”

Section: Structure Geometry and Simulation Resultsmentioning

confidence: 99%

High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid

2020

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“…Another essential parameter to exploit SL effect is Figure of Merit (FOM), which is defined by the product of the average group index and the normalized bandwidth, FOM = 〈𝑛 𝑔 〉𝐵𝑊. In this case, the relative FOM equals FOM=0.4334, which is reported to be FOM=0.554 in Üstün & Kurt (2012) and comparable to the delay-bandwidth product of FOM=0.48 reported in Elshahat et al (2018). A recent study done by Ma et al (2021) proposed a square lattice Si-based PCW configuration with extrinsic (InP) point-defects.…”

Section: Introduction and Dispersion Relations Of Proposed Elliptic Photonic Crystalsmentioning

confidence: 93%

Slow-light effect in symmetry-reduced non-defect photonic crystals

Giden

2022

Turkish Journal of Engineering

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In this study, a two-dimensional low-symmetric photonic crystal (PC) configuration with elliptical geometry is presented and its slow-light (SL) effect is investigated. Reducing the symmetry in the PC unit cell provides slow modes at the higher transverse electric bands. The calculated group index and the corresponding normalized bandwidth equal to {ng, BW}={63.56, 0.0065}. That corresponds to a value of figure of merit (FOM)=0.4344 defined by the product of the average group index and the normalized bandwidth, FOM=〈ng〉BW, which is comparable to the values available in literature. Tracing the whole edges of the Brillouin zone, strongly excited SL modes are observed only along Γ-X but not along Γ-X' or Γ-M. That condition allows for the design of low-symmetric PC waveguides with finite thicknesses at the expense of lowering group index value. The SL effect is still obtained for the proposed lowsymmetric PCs having finite thicknesses, which is numerically proved via finite-difference time-domain methods. It is important to note that non-dispersive SL Bloch modes exist through the non-zero k-vector components of Brillouin zone. Hence, such a defect-free (without either point-or line-defect) SL PC design may have a great potential for the use of compact photonic devices such as in optical switching and biochemical sensing applications.

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“…The quality and performance of the produced graphene cost and its processability should be considered when determining the optimal substrate. 5–7,10–13,15–17,43,45,52,55,56,60,63,67,69,71,73,548–609…”

Section: Rising Issues In the Industrial Production Of Graphene Nanom...mentioning

confidence: 99%

Recent major advances and challenges in the emerging graphene-based nanomaterials in electrocatalytic fuel cell technology

et al. 2022

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Slow-light transmission with high group index and large normalized delay bandwidth product through successive defect rods on intrinsic photonic crystal waveguide

Cited by 27 publications

References 32 publications

High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid

High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid

Slow-light effect in symmetry-reduced non-defect photonic crystals

Recent major advances and challenges in the emerging graphene-based nanomaterials in electrocatalytic fuel cell technology

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