Optical bistability of graphene in PT−symmetric Thue–Morse photonic crystals

Xu, Haihong; Qin, Zhongli; Liu, Fangmei; Dong, Zhen; Ni, Hao; Fanghua, Liu

doi:10.1007/s10853-022-07038-6

Cited by 9 publications

(4 citation statements)

References 25 publications

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“…This means that the operation of the device is bistable for a wide range of intensities. This kind of OB curves with zero switch-down intensities were known to exist in plasmonic devices with nanoparticles [64], PT -symmetric photonic crystals [67], Bose-Einstein condensate optomechanical systems [68], and anti-directional couplers [62]. Even though the switch-down action takes place at zero-intensities, the corresponding switch-up intensities are higher in the reported works [62,64,67,68].…”

Section: Peculiar Ob Curves In the Broken Regime: Increasing Inhomoge...mentioning

confidence: 74%

“…This kind of OB curves with zero switch-down intensities were known to exist in plasmonic devices with nanoparticles [64], PT -symmetric photonic crystals [67], Bose-Einstein condensate optomechanical systems [68], and anti-directional couplers [62]. Even though the switch-down action takes place at zero-intensities, the corresponding switch-up intensities are higher in the reported works [62,64,67,68]. But in the present investigations, the critical switch-up intensity is also low besides the occurrence of switch-down action at zero-intensities.…”

Section: Peculiar Ob Curves In the Broken Regime: Increasing Inhomoge...mentioning

confidence: 81%

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Inhomogeneous nonlinearity meets parity–time-symmetric Bragg structures: route to ultralow power steering and peculiar stable states

et al. 2022

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In the context of parity–time ( P T )-symmetric fiber Bragg gratings, tailoring the nonlinear profile along the propagation coordinate serves as a new direction for realizing low-power all-optical switches. The scheme is fruitful only when the nonlinearity profile will be either linearly decreasing or increasing form. If the rate of variation of the nonlinearity profile is high, the critical intensities fall below the input power of value 0.01 in the unbroken regime provided that the light launching direction is right. Nowadays, every new theoretical inception into the parity–time fiber Bragg grating (PTFBG) has started making sense of switching in the broken P T -symmetric regime, which was once believed to be the instability regime. When the inhomogeneous nonlinearity acts together with the broken P T symmetry and right light incidence, it leads to two peculiar settings. First, the switch-up intensities are ultralow. Second, the switch-down action takes place at zero critical intensities. Such optical bistability curves are unprecedented in the context of conventional gratings and found only in plasmonic devices and anti-directional couplers. Even though the nonlinearity is inhomogeneous, the ramp-like first stable states persist in the broken P T -symmetric regime, giving an additional indication that the broken PTFBG is closely associated with the plasmonic structures. In the existing PTFBG systems, the switching intensities are relatively higher in the broken regime. However, the proposed system records the lowest switching intensities in the broken regime. The reported intensities ( <Peculiar Ob Curves In the Broken Regime: Increasing Inhomoge...mentioning

confidence: 74%

Section: Peculiar Ob Curves In the Broken Regime: Increasing Inhomoge...mentioning

confidence: 81%

Inhomogeneous nonlinearity meets parity–time-symmetric Bragg structures: route to ultralow power steering and peculiar stable states

et al. 2022

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confidence: 99%

Recent Progress in the Fabrication of Photonic Crystals Based on Porous Anodic Materials

et al. 2023

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Photonic crystals (PCs) based on porous anodic materials have been proven to be a potent and versatile instrument for the emergence of new technologies with a wide range of applications. Their lower production costs are one of the key advantages, making PC-based systems more widely available and appropriate for industrial manufacturing. The ability to produce well-defined pores on metal oxide and semiconductor surfaces has experienced a major renaissance due to the striking differences in characteristics between porous surfaces and dense oxide layers. In this review, we give a general overview of the progress of PC fabrication based on porous surfaces of anodized aluminum (Al), silicon (Si), and titanium (Ti) using various anodization techniques, and their optical characteristics and applications are discussed. The anodizing conditions have a large influence on the pore geometry of the produced porous surfaces. The review fully focuses on the advancements made in manufacturing anodic aluminum oxide (AAO), porous silicon (pSi), and titanium-dioxide nanotube (TNT) PCs manufactured using self-ordered anodization under varied conditions. Additionally, a critical assessment of the upcoming developments in PC manufacturing and their optical characteristics suitable for various photonic devices is provided.

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“…In order to greatly enhance the light-graphene interaction, many kinds of graphene-based resonators [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ] and perfect absorbers [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ] have been proposed, and some applications of those structures have been demonstrated [ 35 , 36 , 37 , 38 , 39 ]. Until now, OB in graphene-based resonators has been theoretically and numerically studied [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ]. Most of the previous studies focus on the mid-IR to terahertz band since low-threshold OB could be achieved in those structures due to the strong field enhancement caused by the surface plasmons of graphene.…”

Section: Introductionmentioning

confidence: 99%

Low-Threshold and High-Extinction-Ratio Optical Bistability within a Graphene-Based Perfect Absorber

et al. 2023

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A kind of graphene-based perfect absorber which can generate low-threshold and high-extinction-ratio optical bistability in the near-IR band is proposed and simulated with numerical methods. The interaction between input light and monolayer graphene in the absorber can be greatly enhanced due to the perfect absorption. The large nonlinear coefficient of graphene and the strong light-graphene interaction contribute to the nonlinear response of the structure, leading to relatively low switching thresholds of less than 2.5 MW/cm2 for an absorber with a Q factor lower than 1000. Meanwhile, the extinction ratio of bistable states in the absorber reaches an ultrahigh value of 47.3 dB at 1545.3 nm. Moreover, the influence of changing the structural parameters on the bistable behaviors is discussed in detail, showing that the structure can tolerate structural parametric deviation to some extent. The proposed bistable structure with ultra-compact size, low thresholds, high extinction ratio, and ultrafast response time could be of great applications for fabricating high-performance all-optical-communication devices.

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Optical bistability of graphene in PT−symmetric Thue–Morse photonic crystals

Cited by 9 publications

References 25 publications

Inhomogeneous nonlinearity meets parity–time-symmetric Bragg structures: route to ultralow power steering and peculiar stable states

Inhomogeneous nonlinearity meets parity–time-symmetric Bragg structures: route to ultralow power steering and peculiar stable states

Recent Progress in the Fabrication of Photonic Crystals Based on Porous Anodic Materials

Low-Threshold and High-Extinction-Ratio Optical Bistability within a Graphene-Based Perfect Absorber

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