Illumination-direction multiplexing Fourier ptychographic microscopy using hemispherical digital condensers

Area of Science:

• Optical microscopy
• Nanotechnology
• Materials science

Background:

• Fourier ptychographic microscopy (FPM) enables high-resolution imaging.
• Traditional FPM often requires complex illumination setups.
• Exploring novel illumination strategies is crucial for advancing FPM applications.

Purpose of the Study:

• To investigate illumination patterns using a white-light-emitting hemispherical digital condenser.
• To demonstrate the efficacy of illumination-direction multiplexing (IDM) in FPM.
• To assess the capability of IDM-FPM for imaging subwavelength photonic crystals.

Main Methods:

• Conducted simulations to explore various illumination patterns.
• Performed experiments using selected practical illumination patterns.
• Applied the illumination-direction multiplexing (IDM) Fourier ptychographic microscopy (FPM) method.
• Utilized a white-light-emitting hemispherical digital condenser.

Main Results:

• Successfully implemented IDM-FPM for imaging and phase recovery.
• Demonstrated simultaneous illumination from different directions.
• Achieved imaging of photonic crystals with subwavelength periods.

Conclusions:

• IDM-FPM is a viable technique for high-resolution imaging.
• This method can be implemented with standard microscope condensers.
• The study highlights the potential of IDM-FPM in nanotechnology and materials science.