Harmonically decoupled gradient light interference microscopy (HD-GLIM).

Area of Science:

• Optical Imaging
• Microscopy Techniques
• Quantitative Phase Imaging

Background:

• Differential phase sensitive methods are crucial for quantitative phase imaging, offering compatibility with partially coherent light and optical sectioning.
• Traditional methods like Nomarski microscopy (also known as differential interference contrast or DIC) are established but can be complex.

Purpose of the Study:

• To propose and demonstrate a new system for retrieving differential phase information from transparent samples.
• To simplify quantitative phase imaging by removing the need for specialized DIC optics and phase-only spatial light modulators (SLMs).

Main Methods:

• A 4f optical system incorporating an amplitude-type spatial light modulator (SLM) was developed.
• The system was tested using standard samples, static biological specimens, and dynamic biological specimens.
• The principle of harmonically decoupled gradient light interference microscopy was demonstrated.

Main Results:

• The proposed system successfully retrieves differential phase information from transparent samples.
• The system's performance was validated on various sample types, including biological specimens.
• The method demonstrates the principle of harmonically decoupled gradient light interference microscopy.

Conclusions:

• A novel, simplified system for quantitative phase imaging has been presented.
• The use of an amplitude-type SLM in a 4f system offers an alternative to traditional DIC microscopy.
• This approach is suitable for imaging both static and dynamic biospecimens.