Numerical simulation of partially coherent broadband optical imaging using the finite-difference time-domain method

Area of Science:

• Optics and Photonics
• Computational Electromagnetics
• Microscopy

Background:

• Numerical modeling of optical systems is crucial for fields like biophotonics and photolithography.
• Accurate simulation of broadband optical imaging under realistic illumination conditions is challenging.

Purpose of the Study:

• To develop and validate a full-vector electromagnetic numerical simulation for broadband optical imaging systems.
• To compare simulation results with experimental data for the first time.

Main Methods:

• Utilized the finite-difference time-domain (FDTD) method to calculate light scattering from samples.
• Integrated geometrical optics principles to determine image plane intensity distribution.
• Algorithm supports multilayered object spaces.

Main Results:

• Successfully performed full-vector electromagnetic numerical simulation of a broadband optical imaging system.
• Demonstrated agreement between numerical FDTD calculations and experimental microscopy results.
• Validated the simulation approach for partially coherent and unpolarized illumination.

Conclusions:

• The developed FDTD-based numerical modeling approach is accurate for broadband optical imaging.
• This simulation technique provides a reliable tool for optical system design and analysis.
• Direct comparison with experimental data validates the numerical method's efficacy.