Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Effects of Organic Thin Films on Local Resonance of Metamaterials under Photoexcitation

  • Song, Myeong-Seong (Department of Physics and Optoelectronics Convergence Research Center, Chonnam National University) ;
  • Hwang, In-Wook (Advanced Photonics Research Institute, GIST) ;
  • Lee, Chang-Lyoul (Advanced Photonics Research Institute, GIST) ;
  • Kang, Chul (Advanced Photonics Research Institute, GIST) ;
  • Kee, Chul-Sik (Advanced Photonics Research Institute, GIST) ;
  • Park, Sae June (Department of Physics and Department of Energy Systems Research, Ajou University) ;
  • Ahn, Yeong Hwan (Department of Physics and Department of Energy Systems Research, Ajou University) ;
  • Park, Doo Jae (Department of Physics, Hallym University) ;
  • Lee, Joong Wook (Department of Physics and Optoelectronics Convergence Research Center, Chonnam National University)
  • Received : 2017.03.02
  • Accepted : 2017.06.02
  • Published : 2017.08.25
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Abstract

We demonstrate that the local resonance of metamaterials can be tuned by the effects of organic thin films under photoexcitation. Tris (8-hydroxyquinolinato) aluminum ($Alq_3$) layers are deposited on metamaterial/silicon hybrid structures. By varying the thickness of the $Alq_3$ layer on the subwavelength scale, the resonant peak of the metamaterial becomes very adjustable, due to the effect of a thin dielectric substrate. In addition, under photoexcitation all the spectral peaks of the resonance shift to higher frequencies. This originates from the reduction of the capacitive response generated inside the gaps of split-ring resonators. The adjustability of the electromagnetic spectrum may be useful for developing optical systems requiring refractive-index engineering and active optical devices.

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References

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