Thermal hysteresis in scattering by VO2 spheres

Akhlesh Lakhtakia, Tom G. Mackay, Waleed I. Waseer

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Vanadium dioxide (VO2) transforms from purely monoclinic to purely tetragonal when heated from 58C to 72C, and the transformation is reversible but hysteretic. Electromagnetically, VO2 transforms from a dissipative dielectric to another dissipative dielectric if the free-space wavelength is λ0 < 1100 nm; it transforms from a dissipative dielectric to a plasmonic metal (or vice versa) if λ0 > 1100 nm. Calculating the extinction, total scattering, absorption, radiation pressure, backscattering and forward-scattering efficiencies of a VO2 sphere, we found clear signatures of thermal hysteresis in (i) the forward-scattering, backscattering, and absorption efficiencies for λ0 < 1100 nm, and (ii) the forward-scattering, backscattering, total scattering, and absorption efficiencies for λ0 > 1100 nm. Vacuum and null-permittivity quasistates occur between 58C and 72C, when tetragonal VO2 is a plasmonic metal, once each on the heating branch and once each on the cooling branch of thermal hysteresis. But none of the six efficiencies show significant differences between the two quasistates.

Original languageEnglish (US)
Pages (from-to)1921-1928
Number of pages8
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume39
Issue number10
DOIs
StatePublished - Oct 1 2022

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition

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