Large optical nonlinearity of ITO nanorods for sub-picosecond all-optical modulation of the full-visible spectrum

Peijun Guo, Richard D Schaller, Leonidas E. Ocola, Benjamin T. Diroll, John B. Ketterson, Robert P. H. Chang

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Nonlinear optical responses of materials play a vital role for the development of active nanophotonic and plasmonic devices. Optical nonlinearity induced by intense optical excitation of mobile electrons in metallic nanostructures can provide large-amplitude, dynamic tuning of their electromagnetic response, which is potentially useful for all-optical processing of information and dynamic beam control. Here we report on the sub-picosecond optical nonlinearity of indium tin oxide nanorod arrays (ITO-NRAs) following intraband, on-plasmon-resonance optical pumping, which enables modulation of the full-visible spectrum with large absolute change of transmission, favourable spectral tunability and beam-steering capability. Furthermore, we observe a transient response in the microsecond regime associated with slow lattice cooling, which arises from the large aspect-ratio and low thermal conductivity of ITO-NRAs. Our results demonstrate that all-optical control of light can be achieved by using heavily doped wide-bandgap semiconductors in their transparent regime with speed faster than that of noble metals.

Original languageEnglish
Article number12892
JournalNature Communications
Volume7
DOIs
Publication statusPublished - Sep 29 2016

Fingerprint

Nanotubes
Light modulation
light modulation
visible spectrum
ITO (semiconductors)
Nanorods
indium oxides
tin oxides
nanorods
nonlinearity
Thermal Conductivity
Optical pumping
Nanophotonics
optical control
Semiconductors
beam steering
Nanostructures
Photoexcitation
Electromagnetic Phenomena
transient response

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Large optical nonlinearity of ITO nanorods for sub-picosecond all-optical modulation of the full-visible spectrum. / Guo, Peijun; Schaller, Richard D; Ocola, Leonidas E.; Diroll, Benjamin T.; Ketterson, John B.; Chang, Robert P. H.

In: Nature Communications, Vol. 7, 12892, 29.09.2016.

Research output: Contribution to journalArticle

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AU - Ketterson, John B.

AU - Chang, Robert P. H.

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