Transient Negative Optical Nonlinearity of Indium Oxide Nanorod Arrays in the Full-Visible Range

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Abstract

Dynamic control of the optical response of materials at visible wavelengths is key to future metamaterials and photonic integrated circuits. Materials such as transparent conducting oxides have attracted significant attention due to their large optical nonlinearity under resonant optical pumping condition. However, optical nonlinearities of TCOs are positive in sign and are mostly in the ϵ-near-zero to metallic range where materials can become lossy. Here we demonstrate large amplitude, negative optical nonlinearity (Δn from ?0.05 to ?0.09) of indium oxide nanorod arrays in the full-visible range where the material is transparent. We experimentally quantify and theoretically calculate the optical nonlinearity, which arises from a strong modification of interband optical transitions. The approach toward negative optical nonlinearity can be generalized to other transparent semiconducting oxides and opens door to reconfigurable, subwavelength optical components.

Original languageEnglish
Pages (from-to)1494-1500
Number of pages7
JournalACS Photonics
Volume4
Issue number6
DOIs
Publication statusPublished - Jun 21 2017

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Keywords

  • full-visible range
  • indium oxide
  • negative optical nonlinearity
  • transient
  • transparent semiconducting oxide
  • ultrafast

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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