Resolution enhancement in a fibre scanning microscope by real-time phase shifting.

Area of Science:

• Optical microscopy and imaging systems
• Advanced fibre optics and photonics

Background:

• Lissajous fibre scanning resolution is often limited by the bandwidth of resonant modes.
• Existing methods for improving resolution can increase frame time or disrupt image reconstruction algorithms.

Purpose of the Study:

• To develop a method for improving resolution in Lissajous fibre scanning under bandwidth limitations.
• To minimize frame time while maintaining data integrity for image reconstruction.

Main Methods:

• Dynamically applied phase shifts to one scanning axis to combine data from multiple scans.
• Exploited limited bandwidth of resonant modes to acquire both low- and high-resolution images from a single data stream.
• Implemented with a custom-built three-colour confocal scanner featuring a piezoelectrically-actuated photonic crystal fibre and advanced optical components.

Main Results:

• Demonstrated predicted phase responses and accurate line interlacing.
• Achieved enhanced image resolution without significantly increasing overall frame time.
• Successfully obtained both low- and high-resolution images from the same data stream.

Conclusions:

• The proposed dynamic phase-shifting method effectively overcomes bandwidth limitations in Lissajous fibre scanning.
• This approach offers a practical solution for achieving higher resolution imaging in microscopy applications.
• The method is robust and compatible with Delaunay triangulation for image reconstruction.