Mechanical model of giant photoexpansion in a chalcogenide glass and the role of photofluidity

Manuel Buisson, Yann Gueguen, Romain Laniel, Christopher Cantoni, Patrick Houizot, Bruno Bureau, Jean Christophe Sangleboeuf, Pierre Lucas

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


An analytical model is developed to describe the phenomenon of giant photoexpansion in chalcogenide glasses. The proposed micro-mechanical model is based on the description of photoexpansion as a new type of eigenstrain, i.e. a deformation analogous to thermal expansion induced without external forces. In this framework, it is the viscoelastic flow induced by photofluidity which enable the conversion of the self-equilibrated stress into giant photoexpansion. This simple approach yields good fits to experimental data and demonstrates, for the first time, that the photoinduced viscous flow actually enhances the giant photoexpansion or the giant photocontraction as it has been suggested in the literature. Moreover, it highlights that the shear relaxation time due to photofluidity controls the expansion kinetic. This model is the first step towards describing giant photoexpansion from the point of view of mechanics and it provides the framework for investigating this phenomenon via numerical simulations.

Original languageEnglish (US)
Pages (from-to)85-91
Number of pages7
JournalPhysica B: Condensed Matter
StatePublished - Jul 1 2017


  • Chalcogenide glasses
  • Eigenstrain
  • Photoexpansion
  • Photofluidity
  • Photoinduced fluidity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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