Surface Plasmonic Lattice Solitons in Semi-Infinite Graphene Sheet Arrays

Wang, Zhouqing; Wang, Bing; Long, Hua; Wang, Kai; Lu, Peixiang

doi:10.1109/jlt.2017.2707601

Cited by 41 publications

(19 citation statements)

References 44 publications

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“…Graphene, as an ultrathin two-dimensional material, is embedded in the middle of the lattices z = 0; therefore, the addition of graphene has no effect on the PT symmetry. However, here, we view graphene as an equivalent dielectric with a thickness of d g = 0.34 nm [61,62]. The permittivity of the equivalent dielectric for graphene is expressed as ε g = 1 + iσ g η 0 /(kd g ) [44], where σ g is defined as the total surface conductivity of graphene.…”

Section: Aperiodic Pt Symmetry Latticesmentioning

confidence: 99%

Low Threshold Optical Bistability in Aperiodic PT-Symmetric Lattices Composited with Fibonacci Sequence Dielectrics and Graphene

Zhao

Guo

et al. 2019

Applied Sciences

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We explore the optical bistability in aperiodic parity–time-symmetric (PT-symmetric) photonic lattices that are composed of Fibonacci sequence dielectrics and graphene at terahertz frequencies. Two Fibonacci sequence dielectrics, viz. aperiodic photonic lattices, are utilized for enhancing band-edge resonances and achieving the electric field localization that can enhance the nonlinearity of graphene. Modulating the gain-loss factor of dielectrics in the PT symmetry lattices further strengthens the nonlinearity effect and, consequently, low threshold bistability is realized. The interval between the upper and lower bistability thresholds enlarges as the momentum relaxation time of graphene changes. Moreover, we show that the bistability threshold can also be flexibly tuned by modulating the graphene chemical potential. The study might be applied in photomemories and optical switches.

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Section: Aperiodic Pt Symmetry Latticesmentioning

confidence: 99%

Low Threshold Optical Bistability in Aperiodic PT-Symmetric Lattices Composited with Fibonacci Sequence Dielectrics and Graphene

Zhao

Guo

et al. 2019

Applied Sciences

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“…In recent years, complex photonic crystals (PCs) have provided a new opportunity to explore the non-Hermitian optical properties and other nonlinearities theoretically and experimentally [22][23][24][25][26][27][28]. Many significant optical characteristics have been discovered in PCs, such as solitons [29][30][31][32][33], topological modes [34,35], and strong absorptions [36][37][38][39]. Furthermore, there are bandgap structures in the transmission spectra as light impinges upon PCs, and light field localization can also be implemented in defective PCs, which could be utilized for enhancing the nonlinearity of materials [40,41] and the lateral shifts of reflected beams [42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Exceptional Points in Non-Hermitian Photonic Crystals Incorporated With a Defect

et al. 2020

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We explored exceptional points (EPs) in one dimensional non-Hermitian photonic crystals incorporated with a defect. The defect was asymmetric with respect to the center. Two EPs could be derived by modulating the normalized frequency and the gain-loss coefficient of defect. The reflection coefficient complex phase changed dramatically around EPs, and the change in complex phase was π at EPs. The electric field of EPs was mainly restricted to the defect, which can induce a giant Goos–Hänchen (GH) shift. Moreover, we found a coherent perfect absorption-laser point (CPA-LP) in the structure. A giant GH shift also existed around the CPA-LP. The study may have found applications in highly sensitive sensors.

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“…What is more, we can achieve specific optical functions by synthesizing PCs. PCs can also realize localization of light field [5][6][7][8], unidirectional transmission [9,10], directional cloaking [11], solitons [12][13][14], and other functions [15][16][17][18][19]. Otherwise, PCs are used to control photon flows, which can realize the miniaturization and integration of photonic devices [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Coherent Perfect Absorption Laser Points in One-Dimensional Anti-Parity–Time-Symmetric Photonic Crystals

et al. 2019

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We investigate the coherent perfect absorption laser points (CPA-LPs) in anti-parity–time-symmetric photonic crystals. CPA-LPs, which correspond to the poles of reflection and transmission, can be found in the parameter space composed of gain–loss factor and angular frequency. Discrete exceptional points (EPs) split as the gain–loss factor increases. The CPA-LPs sandwiched between the EPs are proved to be defective modes. The localization of light field and the bulk effect of gain/loss in materials induce a sharp change in phase of the reflection coefficient near the CPA-LPs. Consequently, a large spatial Goos–Hänchen shift, which is proportional to the slope of phase, can be achieved around the CPA-LPs. The study may find great applications in highly sensitive sensors.

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Surface Plasmonic Lattice Solitons in Semi-Infinite Graphene Sheet Arrays

Cited by 41 publications

References 44 publications

Low Threshold Optical Bistability in Aperiodic PT-Symmetric Lattices Composited with Fibonacci Sequence Dielectrics and Graphene

Low Threshold Optical Bistability in Aperiodic PT-Symmetric Lattices Composited with Fibonacci Sequence Dielectrics and Graphene

Exceptional Points in Non-Hermitian Photonic Crystals Incorporated With a Defect

Coherent Perfect Absorption Laser Points in One-Dimensional Anti-Parity–Time-Symmetric Photonic Crystals

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