Angle-invariant imaging using a total internal reflection virtual aperture

Area of Science:

• Optical engineering
• Imaging systems
• Photonics

Background:

• Conventional lens stops cause angle-dependent light loss and reduced resolution.
• Retro-telephoto lenses offer uniform response but suffer from low wide-angle resolution and large volume.

Purpose of the Study:

• To develop an angle-independent virtual aperture for improved wide-angle imaging.
• To design and evaluate monocentric lenses utilizing total internal reflection (TIR).

Main Methods:

• Implemented a virtual aperture using total internal reflection (TIR) from a thin low-index layer.
• Derived a relationship between filtering layer properties and lens F-number.
• Designed two 12 mm focal length, F/2.5 TIR lenses: one solid, one adjustable focus.

Main Results:

• Achieved absolutely uniform resolution and light collection over wide angles (84° and 106°).
• Demonstrated significant improvements in light collection and angular resolution per unit volume.
• Validated the effectiveness of TIR virtual apertures in monocentric wide-angle designs.

Conclusions:

• TIR virtual apertures offer a superior alternative to conventional lens stops for wide-angle imaging.
• The developed lens designs provide enhanced performance and compactness.
• This technology promises advancements in imaging systems requiring wide fields of view.