Optical bistability in a nonlinear-shell-coated metallic nanoparticle

Chen, Hongli; Zhang, Youming; Zhang, Baile; Gao, Lei

doi:10.1038/srep21741

Cited by 21 publications

(8 citation statements)

References 19 publications

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“…Furthermore, as long as the power is within the operating regime of the diode, multiple switching can be obtained without incurring in bistability or irreversible effects [35]- [36].…”

Section: Non-linear Metasurfaces For Cloaked Antennasmentioning

confidence: 99%

On the Use of Nonlinear Metasurfaces for Circumventing Fundamental Limits of Mantle Cloaking for Antennas

Vellucci,

Monti,

Barbuto

et al. 2021

IEEE Trans. Antennas Propagat.

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The aim of this Communication is to investigate and demonstrate the possibility to overcome the fundamental limitations of mantle cloaking for antennas by exploiting non-linear metasurfaces. First, we recap and give additional physical insights about the fundamental bounds that apply to the electric properties of an antenna that is made invisible at its own resonance frequency. Then, an innovative strategy is proposed to circumvent these limits through the introduction of non-linear elements that are able to dynamically transform the geometry of the cloaking metasurface depending on the power level of the impinging field. Different non-linear designs are discussed, and their effectiveness is assessed through the relevant benchmark example of a half-wavelength dipole antenna able to efficiently transmit high-power signals while being invisible to low power ones. In addition, the capability of such non-linear mantle cloaks to enable the shaping of the radiation pattern of an antenna array depending on the power level of the received/transmitted signal is demonstrated. These innovative cloaking devices may find applications in different radiating systems enabling unprecedented functionalities.

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“…Furthermore, as long as the power is within the operating regime of the diode, multiple switching can be obtained without incurring in bistability or irreversible effects [35]- [36].…”

Section: Non-linear Metasurfaces For Cloaked Antennasmentioning

confidence: 99%

On the Use of Nonlinear Metasurfaces for Circumventing Fundamental Limits of Mantle Cloaking for Antennas

Vellucci,

Monti,

Barbuto

et al. 2021

IEEE Trans. Antennas Propagat.

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show abstract

“…( 9), the nonlinear part is usually small compared with the linear part. We can use the mean field approximation to simplify the nonlinear scattering model, where the field intensity at the circumference of the graphene coating is represented by the average value [23,26]. From Eq.…”

Section: Nonlinear Scattering Modelmentioning

confidence: 99%

“…When nonlinear dielectric media are incorporated into the plasmonic structures, large nonlinear effects arise due to the enhanced local fields [19]. Various kinds of nonlinear plasmonic structures are designed to show the optical bistability [20][21][22][23][24][25][26][27]. However, the commonly used conventional Kerr dielectric materials can only display very weak nonlinear responses, which restrict further applications of optical bistability in the high speed all-optical signal processing.…”

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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“…Compared with graphene, the graphene/MoS 2 nanocomposites exhibit higher photoresponse (Zhang et al, 2014), higher dielectric constant, and higher linear absorption (Jiang et al, 2015;He et al, 2017;Qiu et al, 2018;Sun et al, 2018;Xu et al, 2020) due to the excellent properties of the graphene/MoS 2 ; the graphene/MoS 2 nanocomposites can be widely used in the manufacture of dyesensitized solar cells, electrical sensors, and transistors (Liu et al, 2012;Huang et al, 2013;He et al, 2014). In the field of nonlinear optics, the reverse saturable absorption (RSA) property, which is shown by graphene/MoS 2 thin film, shows that the light transmittance decreases with the increase of incident light (Ouyang et al, 2013), and it can be widely used in all optical switches, optical sensors, and other fields (Vabbina et al, 2015;Chen et al, 2016;Iqbal et al, 2019). Nevertheless, graphene/MoS 2 thin films still face many challenges, such as nonlinear response and high nonlinear figure of merit (FOM) values.…”

Section: Introductionmentioning

confidence: 99%

The Broadband Nonlinear Optical Response in Graphene/MoS2/Ag Thin Films at Near Infrared

et al. 2021

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Graphene/MoS2/Ag thin films were successfully prepared by the magnetron sputtering technique and liquid phase exfoliation. Structure, morphology, optical properties, and nonlinear optical characteristics of the graphene/MoS2/Ag and graphene/MoS2 thin films were studied by X-ray diffractometer, spectrophotometer, field-scanning electron microscope, and femtosecond (fs) Z-scan technique. The results of the fs Z-scan experiment indicate that the graphene/MoS2/Ag thin films exhibit reverse saturable absorption properties due to the free carrier absorption and two-photon absorption. More importantly, with the increase of DC magnetron sputtering power (from 5 to 15 W), the local surface plasmon resonance effect of the Ag thin films increases, which leads to the enhancement of nonlinear optical properties of the graphene/MoS2/Ag thin films. The nonlinear absorption coefficients of the graphene/MoS2/Ag thin films are increased from 1.14 × 10–10 to 1.8 × 10–10 m/W at 800 nm and from 4.79 × 10–11 to 6.79 × 10–11 m/W at 1,030 nm, and the nonlinear refraction index of the graphene/MoS2/Ag thin films is -4.37 × 10–17∼−4.18 × 10–16 m2/W under the excitation of 800 and 1,030 nm, respectively. Moreover, when the graphene/MoS2/Ag thin films were excited at 800 and 1,030 nm, respectively, the nonlinear figure of merit values of the graphene/MoS2/Ag thin films are increased from 1.23 to 2.91 and from 1.30 to 1.47, which are enough to support the application of the graphene/MoS2/Ag thin films in the field of all-optical switching applications.

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Optical bistability in a nonlinear-shell-coated metallic nanoparticle

Cited by 21 publications

References 19 publications

On the Use of Nonlinear Metasurfaces for Circumventing Fundamental Limits of Mantle Cloaking for Antennas

On the Use of Nonlinear Metasurfaces for Circumventing Fundamental Limits of Mantle Cloaking for Antennas

Bistable scattering in graphene-coated dielectric nanowires

The Broadband Nonlinear Optical Response in Graphene/MoS2/Ag Thin Films at Near Infrared

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