Gigahertz Acoustic Vibrations of Elastically Anisotropic Indium-Tin-Oxide Nanorod Arrays

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Active control of light is important for photonic integrated circuits, optical switches, and telecommunications. Coupling light with acoustic vibrations in nanoscale optical resonators offers optical modulation capabilities with high bandwidth and small footprint. Instead of using noble metals, here we introduce indium-tin-oxide nanorod arrays (ITO-NRAs) as the operating media and demonstrate optical modulation covering the visible spectral range (from 360 to 700 nm) with ∼20 GHz bandwidth through the excitation of coherent acoustic vibrations in ITO-NRAs. This broadband modulation results from the collective optical diffraction by the dielectric ITO-NRAs, and a high differential transmission modulation up to 10% is achieved through efficient near-infrared, on-plasmon-resonance pumping. By combining the frequency signatures of the vibrational modes with finite-element simulations, we further determine the anisotropic elastic constants for single-crystalline ITO, which are not known for the bulk phase. This technique to determine elastic constants using coherent acoustic vibrations of uniform nanostructures can be generalized to the study of other inorganic materials.

Original languageEnglish
Pages (from-to)5639-5646
Number of pages8
JournalNano Letters
Volume16
Issue number9
DOIs
Publication statusPublished - Sep 14 2016

Fingerprint

Tin oxides
Nanorods
sound waves
indium oxides
Indium
tin oxides
nanorods
Vibrations (mechanical)
Light modulation
light modulation
Acoustics
Elastic constants
elastic properties
Modulation
Optical resonators
bandwidth
Bandwidth
modulation
optical resonators
inorganic materials

Keywords

  • acoustic phonon
  • elasticity
  • Indium-tin-oxide
  • nanorod
  • single crystalline
  • ultrafast spectroscopy

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Gigahertz Acoustic Vibrations of Elastically Anisotropic Indium-Tin-Oxide Nanorod Arrays. / Guo, Peijun; Schaller, Richard D; Ocola, Leonidas E.; Ketterson, John B.; Chang, Robert P. H.

In: Nano Letters, Vol. 16, No. 9, 14.09.2016, p. 5639-5646.

Research output: Contribution to journalArticle

Guo, Peijun ; Schaller, Richard D ; Ocola, Leonidas E. ; Ketterson, John B. ; Chang, Robert P. H. / Gigahertz Acoustic Vibrations of Elastically Anisotropic Indium-Tin-Oxide Nanorod Arrays. In: Nano Letters. 2016 ; Vol. 16, No. 9. pp. 5639-5646.
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