Simulation and analysis of variable numerical aperture wide-field microscopy for telecentricity with constant...

Area of Science:

• Microscopy and Optical Imaging
• Optical Engineering
• Biomedical Optics

Background:

• Conventional wide-field microscopy with Electrically Tunable Lenses (ETL) faces challenges with variable magnification, field-of-view (FOV), and inconsistent resolution.
• Achieving stable and high-resolution imaging over an extended axial range remains a significant hurdle in microscopy.

Purpose of the Study:

• To propose and analyze a novel combination of a variable numerical aperture objective and an ETL for advanced axial scanning in wide-field microscopy.
• To resolve limitations of existing ETL-based systems, including inconsistent magnification, FOV, and lateral/axial resolution.
• To achieve a stationary telecentric image plane with enhanced scanning capabilities.

Main Methods:

• Simulation and analysis of a combined system featuring a variable numerical aperture objective and an ETL.
• Tuning the object plane by adjusting ETL current.
• Modifying object space numerical aperture via an aperture controller to maintain a telecentric image plane.

Main Results:

• The proposed system maintains lateral resolution over an axial range of 7.586mm with a low magnification error of 2.55%.
• Demonstrated fast axial scanning capabilities with an extended scanning range.
• Achieved invariant magnification, constant FOV, and consistent resolution.

Conclusions:

• The novel combination of a variable numerical aperture objective and ETL offers a robust solution for high-performance axial scanning in microscopy.
• The system provides significant advantages including fast and extended axial scanning, autofocusing, invariant magnification, constant FOV, and constant resolution.
• This compact optical setup overcomes key limitations of conventional ETL-based wide-field microscopic systems.