Low threshold optical bistability at terahertz frequencies with graphene surface plasmons

Dai, Xiaoyu; Jiang, Leyong; Xiang, Yuanjiang

doi:10.1038/srep12271

Cited by 89 publications

(43 citation statements)

References 41 publications

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“…Combine the nonlinearity and plasmonic excitation properties together, a body of research is rapidly emerging at the crossroad of nonlinear plasmonics and graphene [20][21][22][23][24]. Besides, there has also been some theoretical interest in optical bistability involving the nonlinear effect of graphene in a free-standing graphene sheet [25], in 2D graphene nanoribbon [13] and in sandwiched structure [26]. Unlike the 1D or 2D system mentioned above, we present a 3D structure, where a dielectric nanosphere is wrapped by graphene, to study the unstable behavior.…”

Section: Introductionmentioning

confidence: 99%

Tunable Optical Bistability and Tristability in Nonlinear Graphene-Wrapped Nanospheres

et al. 2017

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Based on full-wave scattering theory with self-consistent mean field approximation, we study the optical multi-stability of graphene-wrapped dielectric nanoparticles. We demonstrate that the optical bistability (OB) of the graphene-wrapped nanoparticle exist in both near-field and far-field spectra, and show the optical multi-stability arising from the contributions of higher-order terms of the incident external field. Moreover, both the optical stable region and the switching threshold values can be tuned by changing either the Fermi level or the size of the nanoparticle. Our results promise the graphene-wrapped dielectric nanoparticle a candidate of multi-state optical switching, optical memories and relevant optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Tunable Optical Bistability and Tristability in Nonlinear Graphene-Wrapped Nanospheres

et al. 2017

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“…Although various phenomena have been investigated in the framework of the linear response, which is widely used to interpret the low-energy behaviors, the nonlinear response is also important for the elucidation of such electronic structures [26][27][28]. For example, nonlinear optical properties have been extensively studied for graphene [29][30][31]. Graphene is thought of as a strong natural nonlinear material, which provides a convenient setting for the study of quantum excitations.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear optical response of the α−T3 model due to the nontrivial topology of the band dispersion

Chen

Zuber

et al. 2019

Phys. Rev. B

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2019). Nonlinear optical response of the alpha-T-3 model due to the nontrivial topology of the band dispersion. Physical Review B, 100 (3), 035440-1-035440-16. Nonlinear optical response of the alpha-T-3 model due to the nontrivial topology of the band dispersion AbstractWe study the electronic contribution to the nonlinear optical response of the α-T3 model. This model is an interpolation between a graphene (α = 0) and dice (α = 1) lattice. Using a second-quantized formalism, we calculate the first-and third-order responses for a range of α and chemical potential values as well as considering a band gap in the first-order case. Conductivity quantization is observed for the first-order, while higher-order harmonic generation is observed in the third-order response with the chemical potential determining which applied field frequencies both quantization and harmonic generation occur at. We observe a range of experimentally accessible critical fields between 102-106 V/m with dynamics depending on α, μ, and the applied field frequency. Our results suggest an α-T3-like lattice could be an ideal candidate for use in terahertz devices.We study the electronic contribution to the nonlinear optical response of the α-T 3 model. This model is an interpolation between a graphene (α = 0) and dice (α = 1) lattice. Using a second-quantized formalism, we calculate the first-and third-order responses for a range of α and chemical potential values as well as considering a band gap in the first-order case. Conductivity quantization is observed for the first-order, while higher-order harmonic generation is observed in the third-order response with the chemical potential determining which applied field frequencies both quantization and harmonic generation occur at. We observe a range of experimentally accessible critical fields between 10 2 -10 6 V/m with dynamics depending on α, μ, and the applied field frequency. Our results suggest an α-T 3 -like lattice could be an ideal candidate for use in terahertz devices.

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“…Recently, some graphene based plasmonic structures have been de- * Electronic address: hansomchen@zju.edu.cn signed theoretically or realized experimentally to study the optical bistability, e.g. sandwiched structures [30][31][32], a modified Kretschmann-Raether configuration [33], an Otto configuration [34], graphene nanoribbons [35], and graphene nanobubbles [36].…”

Section: Introductionmentioning

confidence: 99%

Bistable scattering in graphene-coated dielectric nanowires

Wang

Zheng

et al. 2017

Nanoscale

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In nonlinear plasmonics, the switching threshold of optical bistability is limited by the weak nonlinear responses from the conventional Kerr dielectric media. Considering the giant nonlinear susceptibility of graphene, here we develop a nonlinear scattering model under the mean field approximation and study the bistable scattering in graphene-coated dielectric nanowires based on the semi-analytical solutions. We find that the switching intensities of bistable scattering can be smaller than 1MW/cm 2 at the working frequency. To further decrease the switching intensities, we show that the most important factor that restricts the bistable scattering is the relaxation time of graphene, rather than the chemical potential and the permittivity of the dielectric nanowire. Our work not only reveals some general characteristics of graphene-based bistable scattering, but also provides a guidance to further applications of optical bistability in the high speed all-optical signal processing.

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Low threshold optical bistability at terahertz frequencies with graphene surface plasmons

Cited by 89 publications

References 41 publications

Tunable Optical Bistability and Tristability in Nonlinear Graphene-Wrapped Nanospheres

Tunable Optical Bistability and Tristability in Nonlinear Graphene-Wrapped Nanospheres

Nonlinear optical response of the α−T3 model due to the nontrivial topology of the band dispersion

Bistable scattering in graphene-coated dielectric nanowires

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