Ultralow-power all-optical tunable double plasmon-induced transparencies in nonlinear metamaterials

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  • Yu Zhu
    Peking University 1 State Key Laboratory for Mesoscopic Physics and Department of Physics, , Beijing 100871, People's Republic of China
  • Xiaoyong Hu
    Peking University 1 State Key Laboratory for Mesoscopic Physics and Department of Physics, , Beijing 100871, People's Republic of China
  • Hong Yang
    Peking University 1 State Key Laboratory for Mesoscopic Physics and Department of Physics, , Beijing 100871, People's Republic of China
  • Qihuang Gong
    Peking University 1 State Key Laboratory for Mesoscopic Physics and Department of Physics, , Beijing 100871, People's Republic of China

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<jats:p>An all-optical tunable double plasmon-induced transparency is realized in a photonic metamaterial coated on the surface of a nanocomposite layer made of polycrystalline indium-tin oxide doped with gold nanoparticles. The local-field effect, quantum confinement effect, and hot-electron injection ensure a large optical nonlinearity for the nanocomposite. A shift of 120 nm in the central wavelength of transparency windows is reached under excitation with a weak pump laser with an intensity of 21 kW/cm2. Compared with previous reports, the threshold pump intensity is reduced by five orders of magnitude, while an ultrafast response time of 34.9 ps is maintained.</jats:p>

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