Polarization grating based on diffraction phase microscopy for quantitative phase imaging of paramecia

Area of Science:

• Biophysics
• Optical microscopy
• Cellular imaging

Background:

• Traditional diffraction phase microscopy (DPM) suffers from sample-dependent fringe contrast, limiting its applications.
• Real-time imaging of live biological samples requires advanced microscopy techniques with stable and adjustable parameters.

Purpose of the Study:

• To introduce and demonstrate a novel polarization grating based diffraction phase microscopy (PG-DPM) technique.
• To showcase the application of PG-DPM in real-time bio-imaging of live microorganisms.
• To investigate the locomotion characteristics of paramecia using PG-DPM.

Main Methods:

• Development of a PG-DPM system utilizing a polarization grating to control illumination polarization.
• Implementation of adjustable fringe contrast by modifying the polarization state of the light source.
• Application of PG-DPM for real-time phase imaging of live paramecia.

Main Results:

• PG-DPM provides adjustable fringe contrast, overcoming limitations of traditional DPM.
• Successfully achieved real-time phase imaging of live paramecia.
• Observed that paramecia exhibit self-helical forward motion, with 77% clockwise and 23% anti-clockwise rotation.

Conclusions:

• PG-DPM is a versatile and powerful tool for bio-imaging, offering enhanced control over image quality.
• The study provides novel insights into the complex locomotion patterns of paramecia.
• PG-DPM holds significant potential for diverse applications across various scientific fields.