Nanoscale probing of resonant photonic modes in dielectric nanoparticles with focused electron beams

Qianlang Liu, Steven C. Quillin, David J. Masiello, Peter Crozier

Research output: Contribution to journalArticle

Abstract

Understanding the optical responses of nanostructures with high spatial resolution is paramount in photonic engineering. The excitation of resonant optical-frequency geometric modes in oxide nanoparticles is explored using monochromated electron energy-loss spectroscopy in a scanning transmission electron microscope. These geometric or cavity modes are found to produce a progression of resonance peaks within the bandgap regions of the electron energy-loss spectra of CeO2, TiO2, and MgO nanoparticles. Complementary simulations of the electron probe combined with analytic Mie analysis are performed to interpret the complex spectral features and to understand their underlying physical origins. The factors that influence the energies, shapes, and strengths of these modes are also investigated and their dependence upon nanoparticle size, geometry, refractive index, aggregation, impact parameter, and electron kinetic energy are elucidated. Taken together, this work demonstrates the unique ability of fast electron spectroscopy to determine the photonic density of states in individual and complex assemblies of dielectric nanoparticles.

Original languageEnglish (US)
Article number165102
JournalPhysical Review B
Volume99
Issue number16
DOIs
StatePublished - Apr 3 2019
Externally publishedYes

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Photonics
Electron beams
photonics
electron beams
Nanoparticles
nanoparticles
Electrons
energy dissipation
electron energy
Electron spectroscopy
Electron energy loss spectroscopy
electron probes
progressions
Kinetic energy
Oxides
assemblies
electron spectroscopy
Nanostructures
Refractive index
Energy dissipation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Nanoscale probing of resonant photonic modes in dielectric nanoparticles with focused electron beams. / Liu, Qianlang; Quillin, Steven C.; Masiello, David J.; Crozier, Peter.

In: Physical Review B, Vol. 99, No. 16, 165102, 03.04.2019.

Research output: Contribution to journalArticle

Liu, Qianlang ; Quillin, Steven C. ; Masiello, David J. ; Crozier, Peter. / Nanoscale probing of resonant photonic modes in dielectric nanoparticles with focused electron beams. In: Physical Review B. 2019 ; Vol. 99, No. 16.
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