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  • IOP Publishing  (3)
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  • IOP Publishing  (3)
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  • 1
    Online Resource
    Online Resource
    Sintering reaction and microstructure of MAl (M = Ni, Fe, and Mg) nanoparticles through molecular dynamics simulation*
    IOP Publishing ; 2020
    In:  Chinese Physics B Vol. 29, No. 11 ( 2020-11-01), p. 116601-
    Details
    In: Chinese Physics B, IOP Publishing, Vol. 29, No. 11 ( 2020-11-01), p. 116601-
    Abstract: The sintering–alloying processes of nickel (Ni), iron (Fe), and magnesium (Mg) with aluminum (Al) nanoparticles were studied by molecular dynamics simulation with the analytic embedded-atom model (AEAM) potential. Potential energy, mean heterogeneous coordination number N A B , and surface atomic number N surf–A were used to monitor the sintering–reaction processes. The effects of surface segregation, heat of formation, and melting point on the sintering–alloying processes were discussed. Results revealed that sintering proceeded in two stages. First, atoms with low surface energy diffused onto the surface of atoms with high surface energy; second, metal atoms diffused with one another with increased system temperature to a threshold value. Under the same initial conditions, the sintering reaction rate of the three systems increased in the order MgAl 〈 FeAl 〈 NiAl. Depending on the initial reaction temperature, the final core–shell (FeAl and MgAl) and alloyed (NiAl and FeAl) nanoconfigurations can be observed.
    Type of Medium: Online Resource
    ISSN: 1674-1056
    URL: Article
    DOI: 10.1088/1674-1056/aba2dd
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2412147-2
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Switchable triple plasmon-induced transparency in graphene sandwich metamaterial structures
    IOP Publishing ; 2022
    In:  Journal of Physics D: Applied Physics Vol. 55, No. 44 ( 2022-11-03), p. 445101-
    Details
    In: Journal of Physics D: Applied Physics, IOP Publishing, Vol. 55, No. 44 ( 2022-11-03), p. 445101-
    Abstract: In this research, a metamaterial structure composed of graphene sandwich structure is put forward to achieve triple plasmon-induced transparency. This phenomenon is generated by bright–bright modes interaction in the proposed structure, and the results calculated though couple mode theory are consistent with the simulation ones using finite difference time domain method. In addition, the effects of graphene Fermi level and scattering rate on the transmission spectrum are also discussed. It is found that the five-fold switching effects are achieved with the modulation depths (MDs) of 92%, 91%, 95%, 90% and 94%, respectively. What is more, the different graphene strip can also be adjusted by changing Fermi levels to achieve the switching effects with the MDs of 98% and 97%. This model has the prospect to be applied in multi-functional modulators and optical switches in terahertz band.
    Type of Medium: Online Resource
    ISSN: 0022-3727 , 1361-6463
    URL: Article
    DOI: 10.1088/1361-6463/ac8be0
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 209221-9
    detail.hit.zdb_id: 1472948-9
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  • 3
    Online Resource
    Online Resource
    Dynamically tunable plasmon-induced transparency effect based on graphene metasurfaces
    IOP Publishing ; 2022
    In:  Journal of Physics D: Applied Physics Vol. 55, No. 11 ( 2022-03-17), p. 115105-
    Details
    In: Journal of Physics D: Applied Physics, IOP Publishing, Vol. 55, No. 11 ( 2022-03-17), p. 115105-
    Abstract: Plasmon-induced transparency (PIT) is theoretically explored for a graphene metamaterial using finite-difference time-domain numerical simulations and coupled-mode-theory theoretical analysis. In this work, the proposed structure consists of one rectangular cavity and three strips to generate the PIT phenomenon. The PIT window can be regulated dynamically by adjusting the Fermi level of the graphene. Importantly, the modulation depth of the amplitude can reach 90.4%. The refractive index sensitivity of the PIT window is also investigated, and the simulation results show that a sensitivity of 1.335 THz RIU −1 is achieved. Additionally, when the polarization angle of the incident light is changed gradually from 0° to 90°, the performance of the structure is greatly affected. Finally, the proposed structure is particularly enlightening for the design of dynamically tuned terahertz devices.
    Type of Medium: Online Resource
    ISSN: 0022-3727 , 1361-6463
    URL: Article
    DOI: 10.1088/1361-6463/ac3f5b
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 209221-9
    detail.hit.zdb_id: 1472948-9
    Location Call Number Limitation Availability
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    Online Resource
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