Negative reflection and total internal reflection at the internal surface of lithium niobate crystal

Area of Science:

• Optics
• Condensed Matter Physics
• Materials Science

Background:

• Negative uniaxial materials exhibit unique optical properties.
• Anisotropic media like lithium niobate are crucial in optical devices.
• Understanding light reflection at interfaces is fundamental in optics.

Purpose of the Study:

• To derive expressions for wave and Poynting vectors in the reflection domain for negative uniaxial materials.
• To investigate the influence of optical axis rotation and incident angle on reflected light.
• To establish conditions for specific polarization states and analyze phenomena like Brewster angle and walk-off.

Main Methods:

• Analytical derivation of wave and Poynting vector expressions.
• Investigation of light propagation from anisotropic to isotropic media.
• Analysis of total internal reflection and polarization states.

Main Results:

• Expressions for wave and Poynting vectors derived for negative uniaxial materials.
• Brewster angle condition derived, and walk-off between TE/TM modes discussed.
• Conditions for parallel wave and Poynting vectors, linear, and circular polarization established.
• Refractive indices for isotropic materials determined at various wavelengths (632 nm, 1550 nm, 3500 nm).

Conclusions:

• The study provides a comprehensive analytical framework for light reflection in negative uniaxial materials.
• Optical axis orientation significantly impacts reflected wave and Poynting vectors and polarization.
• The findings are relevant for designing optical components utilizing anisotropic materials.