Photonic crystal double-coupled cavity waveguides and their application in design of slow-light delay lines

Danaie, Mohammad; Geravand, Alireza; Mohammadi, Saeed

doi:10.1016/j.photonics.2017.11.009

Cited by 48 publications

(12 citation statements)

References 68 publications

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“…Here we examine a method for finding the transmission coefficients for different wavelengths of TM‐polarized light through a 2D square symmetrical PC. We send a incident wave from all of the left side boundary vertices by adding to their values at time instance

t

the modified Gaussian function

g(t)={e}^{-{\left(\left(t-{t}_0\right)/d\right)}^2}\sin \left(2\pi {f}_m\left(t-{t}_0\right)\right),

where

d=3/\pi {f}_m

defines the half‐bandwidth of the pulse and

{f}_m

is the center of the frequency area of interest 32 . The wavelength

\lambda

inside the surrounding medium is one half of the lattice constant

a

.…”

Section: Numerical Resultsmentioning

confidence: 99%

Discrete exterior calculus for photonic crystal waveguides

Colomés¹,

Verdugo²,

Akkerman³

2022

Numerical Meth Engineering

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The discrete exterior calculus (DEC) is very promising, though not yet widely used, discretization method for photonic crystal (PC) waveguides. It can be seen as a generalization of the finite difference time domain (FDTD) method.The DEC enables efficient time evolution by construction and fits well for nonhomogeneous computational domains and obstacles of curved surfaces. These properties are typically present in applications of PC waveguides that are constructed as periodic structures of inhomogeneities in a computational domain. We present a two-dimensional DEC discretization for PC waveguides and demonstrate it with a selection of numerical experiments typical in the application area. We also make a numerical comparison of the method with the FDTD method that is a mainstream method for simulating PC structures. Numerical results demonstrate the advantages of the DEC method.

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t

the modified Gaussian function

g(t)={e}^{-{\left(\left(t-{t}_0\right)/d\right)}^2}\sin \left(2\pi {f}_m\left(t-{t}_0\right)\right),

where

d=3/\pi {f}_m

defines the half‐bandwidth of the pulse and

{f}_m

is the center of the frequency area of interest 32 . The wavelength

\lambda

inside the surrounding medium is one half of the lattice constant

a

.…”

Section: Numerical Resultsmentioning

confidence: 99%

Discrete exterior calculus for photonic crystal waveguides

Colomés¹,

Verdugo²,

Akkerman³

2022

Numerical Meth Engineering

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show abstract

“…It ends up enhancing the overall performance by such a hybridization. The hybrid sensor can expand the abilities of both plasmonic and PhC-based sensors via the simultaneous use of the strong light-matter interaction of the plasmonic component and the low losses of the PhC 57 – 59 . Furthermore, much less metal material is utilized in hybrid PhC-P sensors in comparison to purely plasmonic sensors which results in reducing the propagation losses and fabrication costs 5 , 60 .…”

Section: Introductionmentioning

confidence: 99%

Hybridization of surface plasmons and photonic crystal resonators for high-sensitivity and high-resolution sensing applications

Hajshahvaladi

Kaatuzian

Moghaddasi

et al. 2022

Sci Rep

Self Cite

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In this paper, an optical refractive index (RI) sensor based on a hybrid plasmonic-photonic crystal (P-PhC) is designed. In the sensor’s structure, some metallic rods are embedded in a rod-type photonic crystal (PhC) structure. Numerical simulations are performed based on the finite-difference time-domain (FDTD) method. The obtained results illustrate that the localized surface plasmons (LSP) induced by metallic rods can be excited in a PhC lattice to generate a hybrid P-PhC mode. According to the results, the hybrid mode provides unique opportunities. Using metallic rods in the coupling regions between waveguides and the resonant cavity significantly increases the interaction of the optical field and analyte inside the cavity. The simulation results reveal that high sensitivity of 1672 nm/RIU and an excellent figure of merit (FoM) of 2388 RIU−1 are obtained for the proposed hybrid P-PhC sensor. These values are highest compared to the purely plasmonic and or purely PhC sensors reported in the literature. The proposed sensor could simultaneously enhance sensitivity and FoM values. Therefore, the proposed hybrid P-PhC RI sensor is a more fascinating candidate for high-sensitivity and high-resolution sensing applications at optic communication wavelengths.

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“…at room temperature with wide bandwidths [3] and possess low dispersion and distortion for light propagation [4]. With technologically valuable developmentsof silicon-based PCWs, slotted photonic crystal waveguide (SPCW)attracted the attention of many researchersdue to the combination of two important features in numerous applications: it can merge the abilities to confine light in the low-index material in slots and enhancing the slow-light property of PCWs [5].…”

Section: Introductionmentioning

confidence: 99%

Sporadic-Slot Photonic-Crystal Waveguide for All-Optical Buffers With Low-Dispersion, Distortion, and Insertion Loss

et al. 2020

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A novel structure is studied with implanting sporadic slots inside a photonic crystal waveguide (PCW) to form sporadic-slot PCW (SSPCW) for realizing compact, all-optical buffers with lowdispersion, distortion, and attenuation (DDA). We implement the first demonstration that, to the best of our knowledge, the SSPCW works for both TE-and TM-modes all-optical buffers and slow-light waveguides. High buffer performance and wider transmission bandwidth in telecommunication band are obtained, which are guaranteed through bit rate optimization that exceeded 2 Tb/s for both TE and TM modes in ultra-low dispersion region which is 20 times greater than that required for 5G mobile communications and it is also useful for all-optical signal processing. The storage length of 1 bit is obtained as 4.5202 µm for TE mode and 6.0525 µm for TM mode. Moreover, a low relative pulse distortion of 0.0801% µm −1 along the propagation path per unit length is acquired for a 0.63 ps pulse. Besides, the attenuation coefficient of the optical power pulse between the input and output is 0.0170 dB/µm. Additionally, the deigned SSPCW is insensitive for small variations of waveguide parameters and the deviation is virtually negligible between the simulated results and that of the fabricated structures with totally acceptable tolerance below ±3 nm, which is the challenge in the fabrication process of conventional PCW and PCW-cavity.

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Photonic crystal double-coupled cavity waveguides and their application in design of slow-light delay lines

Cited by 48 publications

References 68 publications

Discrete exterior calculus for photonic crystal waveguides

Discrete exterior calculus for photonic crystal waveguides

Hybridization of surface plasmons and photonic crystal resonators for high-sensitivity and high-resolution sensing applications

Sporadic-Slot Photonic-Crystal Waveguide for All-Optical Buffers With Low-Dispersion, Distortion, and Insertion Loss

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