Retrieving "Amorphous Polymer Films" from the archives

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1. Optical Activity

   Linked via "amorphous polymer films"

   Stress-Induced Activity
   Applying mechanical stress ($\sigma$) across an isotropic material, such as highly purified amorphous polymer films, can induce temporary optical activity. This is because the uniaxial strain breaks the statistical equivalence of molecular orientations, creating transient alignment that favors one polarization state over the other. The induced rotation $\alpha{ind}$ is linearly related to the applied stress via the photoelastic coefficients $\gamma{ijkl}$:
   $$\alpha{ind} \propto \sum{i…