Observation of elliptically polarized light from total internal reflection in bubbles

Area of Science:

• Optics and Photonics
• Fluid Dynamics
• Environmental Science

Background:

• Bubbles form naturally due to pressure and surface tension differences.
• Total internal reflection (TIR) at bubble interfaces can cause phase shifts in light.
• Natural elliptical polarization sources are rare, with air bubbles in water being a notable example.

Purpose of the Study:

• To investigate the polarization conversion of light by air bubbles in water.
• To analyze the phenomenon of total internal reflection at the water-air interface.
• To explore the generation of elliptical polarization from natural sources.

Main Methods:

• Utilizing an imaging polarimeter to capture stationary and dynamic scenes.
• Studying air bubbles in water under various indoor and outdoor conditions.
• Analyzing light interactions at the bubble interface, specifically total internal reflection.

Main Results:

• Demonstrated that air bubbles in water can convert linearly polarized skylight to elliptically polarized light with up to 53% efficiency.
• Confirmed total internal reflection at the water-air interface as a significant source of elliptical polarization.
• Quantified polarization changes in both static and dynamic bubble scenarios.

Conclusions:

• Total internal reflection at air-water interfaces is a key mechanism for generating elliptical polarization in nature.
• The study provides valuable data for fluid dynamics, remote sensing, and polarimetry.
• Imaging polarimetry is an effective technique for analyzing bubble-induced polarization effects.