Abstract
General expressions are derived for the magnitude and dispersion of elasto-optic coefficients in terms of strain-induced modifications of both the electronic energy-band structure, and, if present, the excitonic structure. This analysis uses the deformation potential concept in conjunction with oscillator models for the important optical transitions to describe strain-induced energy shifts, and also emphasizes the importance of strain-dependent oscillator strengths. Results are compared with existing elasto-optic dispersion data in materials having no excitonic contribution (e.g., LiNb${\mathrm{O}}_{3}$ and Si) and in materials with important excitonic contributions (e.g., alkali halides and CdS). In the case of ferroelectric crystals, two important ferroelectricity-related contributions to the elasto-optic effect are identified. The first relates to a strain-dependent Curie temperature, and the second to the enhancing effect of polarization fluctuations near the Curie point in the paraelectric phase.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.