A low-power all optical decoder based on photonic crystal nonlinear ring resonators

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

doi:10.1016/j.ijleo.2018.08.090

Cited by 58 publications

(40 citation statements)

References 52 publications

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“…It can be concluded that the threshold intensity for switching is around 0.235 W/µm 2 . This value is less than one in other works [45,57,59,60], so it can be considered an advantage of the proposed switch. Figure 5 shows the normalized electric field distribution for two optical intensities,0.1 W/µm 2 and 0.45 W/µm 2 .…”

Section: Resultsmentioning

confidence: 67%

“…Approaching the amount of 0.3 ps and 0.4 ps for rise and fall times is the main advantage of this work. Because of the large nonlinear coefficient of graphene in comparison with materials such as chalcogenide, silicon, nanocrystals, and gallium arsenide, the needed threshold intensity for switching operation in this study has been reduced to 0.235 W/µm 2 in comparison to references [57][58][59][60]. This is another advantage of the graphene-based switch.…”

Section: Discussionmentioning

confidence: 89%

“…In this study, the intensity value at output port divides to input intensity Changing the refractive index of the nonlinear rods results in changing the effective index of the ring resonator, and hence, the switching operation could be approached. The more nonlinear coefficient for graphene in comparison with chalcogenide and nanocrystal [60,62] assists in reducing the needed optical power for switching. In this study, with respect to the aforementioned issue, the graphene was used in the ring resonator to propose a low-threshold all-optical switch.…”

Section: Resultsmentioning

confidence: 99%

“…In this way, Alipour-Banaei et al proposed another optical switch by a focus on the power issue [59]. Although they approached the power level 1.5 KW/µm 2 , the footprint was notably increased to as large as 360 µm 2 .Recently, Daghooghi et al developed a PC-based switch for a decoding operation which used a 31 × 31 lattice of silicon rods in the air [60]. They employed nanocrystal material in which the nonlinear coefficient was 10 −16 m 2 /W and succeeded in reducing the threshold power level to 13 W/µm 2 , while the footprint was considerably increased.As mentioned, many attempts have been done to reduce the threshold power level for switching, as well as the size of the structure.…”

mentioning

confidence: 99%

“…Recently, Daghooghi et al developed a PC-based switch for a decoding operation which used a 31 × 31 lattice of silicon rods in the air [60]. They employed nanocrystal material in which the nonlinear coefficient was 10 −16 m 2 /W and succeeded in reducing the threshold power level to 13 W/µm 2 , while the footprint was considerably increased.…”

mentioning

confidence: 99%

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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%