Interference phase-contrast imaging technology without beam separation.

Area of Science:

• Optics and Photonics
• Microscopy
• Interferometry

Background:

• Traditional interferometers, including phase-contrast and differential interference contrast microscopes, rely on splitting and recombining light beams.
• This beam separation complicates device configuration and increases equipment size.
• There is a need for simpler, more compact phase-contrast imaging techniques.

Purpose of the Study:

• To propose and demonstrate a new method for observing phase-contrast images without the need for beam separation.
• To utilize self-interference within a grating coupler structure for phase-contrast imaging.
• To simplify the optical configuration of phase-contrast microscopy.

Main Methods:

• Implementation of a grating coupler structure at the observation plane.
• Utilizing self-interference within the grating coupler to generate phase-contrast effects.
• Experimental validation using a multilevel phase plate for resolution measurements.

Main Results:

• Successful generation of phase-contrast images through self-interference, eliminating the need for beam splitting.
• Demonstration of a significantly simplified optical configuration.
• Phase-contrast depth resolution approaching one-tenth of a wavelength was confirmed.

Conclusions:

• The proposed self-interference method offers a viable alternative to conventional beam-splitting interferometers for phase-contrast imaging.
• This technique enables simpler and more compact phase-contrast microscopy systems.
• The method achieves high resolution, making it suitable for sensitive measurements.