Ultra-fast all-optical decoder based on nonlinear photonic crystal ring resonators

Daghooghi, Tina; Soroosh, Mohammad; Ansari-Asl, Karim

doi:10.1364/ao.57.002250

Cited by 66 publications

(31 citation statements)

References 38 publications

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“…The fall time is assumed as the during time for decreasing power from a steady-state value to 10% of it. Comparing the obtained times with the ones in other works [75] demonstrates that the proposed graphene-based switch is faster than them. This characteristic is an essential factor in optical switching applications.…”

Section: Resultsmentioning

confidence: 67%

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All-Optical Ultra-Fast Graphene-Photonic Crystal Switch

et al. 2019

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In this paper, an all-optical photonic crystal-based switch containing a graphene resonant ring has been presented. The structure has been composed of 15 × 15 silicon rods for a fundamental lattice. Then, a resonant ring including 9 thick silicon rods and 24 graphene-SiO2 rods was placed between two waveguides. The thick rods with a radius of 0.41a in the form of a 3 × 3 lattice were placed at the center of the ring. Graphene-SiO2 rods with a radius of 0.2a were assumed around the thick rods. These rods were made of the graphene monolayers which were separated by SiO2 disks. The size of the structure was about 70 µm2 that was more compact than other works. Furthermore, the rise and fall times were obtained by 0.3 ps and 0.4 ps, respectively, which were less than other reports. Besides, the amount of the contrast ratio (the difference between the margin values for logics 1 and 0) for the proposed structure was calculated by about 82%. The correct switching operation, compactness, and ultra-fast response, as well as the high contrast ratio, make the presented switch for optical integrated circuits.

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Section: Resultsmentioning

confidence: 67%

“…Also, the low power and high contrast ratio are other important parameters for designing different switches. Some attempts have been done to improve the characteristics of optical switches [61,75].…”

Section: Discussionmentioning

confidence: 99%

All-Optical Ultra-Fast Graphene-Photonic Crystal Switch

et al. 2019

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“…They prepare a proper medium to control the flow of light. Due to their attractive effects, including the photonic bandgap (PBG) [5], scalability [6], slow light mode [7], and self-collimation [8], many attempts have been made for designing photonic crystal-based devices, such as decoders [9][10][11][12][13][14][15][16], encoders [17][18][19], analog-to-digital converters [20][21][22], adders [23][24][25], and flip-flops [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…Optical decoders are known as the main blocks in optical integrated circuits. Some photonic crystal-based structures have been provided to all-optical 2-to-4 decoders [9][10][11][12][13][14][15][16]. Alipour et al presented a square array of 29 and 22 rods, along with the x and z directions, where the lattice constant was equal to 825 nm [9].…”

Section: Introductionmentioning

confidence: 99%

“…Using four resonant rings, they succeeded in increasing the mentioned gap up to 53% while the delay time was reported around 6.3 ps. Using three resonant rings, they modified the previous structure and decreased the delay time to 2 ps [15]. However, the area of the structure and the mentioned gap were changed to 380 µm 2 and 35%, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Performance of 2-To-4 Optical Decoders Based on Photonic Crystal Structures

2019

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In this study, a novel, two-dimensional photonic crystal-based structure for the 2-to-4 optical decoder is presented. The structure consists of 23 rows and 14 columns of chalcogenide rods that are arranged in a square lattice with a spatial periodicity of 530 nm. The bias and the optical signals are guided toward the main waveguide through the three waveguides. Two unequal powers are applied to the input ports to approach the different intensities proportional to four working states into the main waveguide. Four cavities including the nonlinear rods are in response to drop the optical waves toward the output ports. To calculate the band diagram and the spatial distribution of the electric and magnetic fields, the plane wave expansion and the finite difference time domain methods have been used. The delay time of the designed structure is obtained around 220 fs, which is less than one for the previous structures. Furthermore, the gap between the margins for logic 0 and 1 is equal to 83%, which is higher than one for other works. Besides, the area of the structure is reduced to 90 µm2 in comparison to all reported structures. Based on the mentioned results, it seems that an improvement of the performance for 2-to-4 optical decoders has been obtained in this research.

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Dynamic Nanophotonics in Epsilon‐Near‐Zero Conductive Oxide Films and Metasurfaces: A Quantitative, Nonlinear, Computational Model

Baxter

Pérez-Casanova

Cortes-Herrera

et al. 2023

Advanced Photonics Research

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The promise of dynamic nanophotonic technologies relies on the confinement and spatiotemporal control of light at the nanoscale. Confinement via plasmonics, dielectric resonators, and waveguides can be complemented with materials whose optical properties can be controlled using nonlinear effects. Transparent conducting oxides (TCOs) exhibit strong optical nonlinearities in their near‐zero permittivity spectral region, on the femtosecond timescale. Harnessing full spatiotemporal control over the nonlinear response requires a deeper understanding of the process. To achieve this, a self‐consistent multiphysics time‐domain model for the nonlinear optical response of TCOs is developed and implemented into a 3D finite‐difference time‐domain code. Simulations are compared and tuned against recently published experimental results for intense laser irradiation of thin indium tin oxide (ITO) films, achieving good quantitative agreement; the time‐domain dynamics of the nonlinear response and the phenomenon of time‐refraction are also explored. Finally, by simulating intense laser irradiation of a plasmonic particle on an ITO film, the applicability of the approach to time‐varying metasurfaces is demonstrated. As expected, significant enhancement of the nonlinear response of an ITO‐based metasurface over bare ITO thin films is found. This work thus enables quantitative nanophotonics design with conductive oxides in their epsilon‐near‐zero region.

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Ultra-fast all-optical decoder based on nonlinear photonic crystal ring resonators

Cited by 66 publications

References 38 publications

All-Optical Ultra-Fast Graphene-Photonic Crystal Switch

All-Optical Ultra-Fast Graphene-Photonic Crystal Switch

Improving the Performance of 2-To-4 Optical Decoders Based on Photonic Crystal Structures

Dynamic Nanophotonics in Epsilon‐Near‐Zero Conductive Oxide Films and Metasurfaces: A Quantitative, Nonlinear, Computational Model

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