Direct observation of a transition of a surface plasmon resonance from a photonic crystal effect

  • Zhang W
  • Azad A
  • Han J
 et al. 
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Transition of surface-plasmon resonance from out-of-plane photonic crystal effect is observed in a semiconductor array of subwavelength holes by optical pump-terahertz probe measurements. The dielectric properties of the photoexcited array are essentially altered by the intense optical excitation due to photogenerated free carriers. As a result, the array becomes metallic and favors the coupling and propagation of surface plasmons. The photoinduced resonant extremes agree well with the Fano model.

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  • Weili Zhang

  • Abul K. Azad

  • Jiaguang Han

  • Jingzhou Xu

  • Jian Chen

  • X. C. Zhang

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