Design method for nonsymmetric imaging optics consisting of freeform-surface-substrate phase elements.

Area of Science:

• Optics and Photonics
• Optical Engineering
• Nanotechnology

Background:

• Traditional optical systems use geometric elements, which can be bulky and complex.
• Phase elements, such as diffractive optical elements and metasurfaces, offer potential for miniaturization and enhanced performance.
• Existing design methods for phase elements may lack efficiency or flexibility for complex systems.

Purpose of the Study:

• To propose an efficient design method for imaging systems utilizing freeform-surface-substrate phase elements.
• To demonstrate the capability of generating compact, high-performance imaging systems.
• To provide a versatile framework for designing next-generation optical systems.

Main Methods:

• A design process starting with simple geometric surfaces, followed by iterative construction.
• Calculation of geometric substrate surfaces and closed-form phase functions.
• Development of a design framework applicable to various substrate constraints.

Main Results:

• Successful design of two compact, high-performance imaging systems meeting design requirements.
• Achieved minimal distortions and modulation transfer function (MTF) curves near the diffraction limit.
• Demonstrated the feasibility and generality of the proposed design method.

Conclusions:

• The proposed design method enables the creation of advanced imaging systems with phase elements.
• This framework supports the development of compact, lightweight, and high-performance optical devices.
• The method is suitable for diverse applications, including near-eye displays, cameras, and remote sensing.